How to reduce the impact of television on health?

The flame retardant material in the TV will fission at high temperatures, thus producing brominated dioxin, which is harmful to human health. So what should we pay attention to when watching TV?

When watching TV, it is best to ventilate for 10 minutes every hour to effectively reduce the indoor concentration of respirable particulate matter and bromodioin. In addition, do not eat while watching TV, because bromodiamine has a strong adsorption ability to food.

When watching TV, you should sit directly in front of the TV. The optimal distance is 6-8 times the diagonal of the TV screen. After watching TV, wash exposed skin with warm water.

After the TV has been used for a period of time, it is best to ask professionals to clean it. You can also use a small vacuum cleaner to simply clean the heat dissipation holes.

Opening windows in traffic jams is useless

Traffic jams are common in cities. When encountering traffic jams, many people will roll down their windows to get some air, or turn off the air conditioner and open their windows to save fuel. As everyone knows, it is best not to open the window when there is a traffic jam.

Experts said that places with serious traffic jams are narrow, crowded, and have poor air circulation, and the content of benzopyrene is high. Benzopyrene is a gas with a special smell. This substance can be produced when burning gasoline, coal or smoking. It not only irritates the respiratory tract, but is also a carcinogen. In addition, due to incomplete combustion in the engine, other harmful substances will be produced in the air, such as benzene, toluene, xylene, suspended particulate matter, etc.

Generally speaking, pollution on main highways and traffic light intersections is very serious. Main roads are prone to form strip-shaped pollution zones. The pollution level is centered on the main road and gradually weakens from the middle to both sides. At traffic light intersections, poisonous gases are released mainly when the engine starts when the light turns green.

In fact, many people who encounter traffic jams open their windows to get some air because they are agitated. At this time, you might as well listen to music or chat to relieve your mood. You can also think about dinner recipes or plan your work for the week, so that you won't find it difficult to be stuck in traffic.

How to remove and reduce air pollution in new cars

With the improvement of people’s living standards, some consumers have bought their beloved new cars, but the air pollution in new cars has also become more and more serious. The more people are worried about it, experts remind car buyers to pay attention to:

1. Within six months of driving a new car, do not close the windows tightly while driving, and use the air conditioner as little as possible to enhance ventilation and ventilation in the car. to release harmful substances in the car as soon as possible;

2. If the car owner has his own garage, he can often open the doors and windows for ventilation when not driving;

3. Car The interior decoration must be strictly selected to prevent floor glue and seat cover cushions containing harmful substances from being decorated into the car;

4. Newly purchased car seat covers and other textiles are likely to contain formaldehyde, so it is best to first Rinse with clean water before use;

5. You can choose some plants, flowers or fruits that can release fragrance and put them in the car. However, this can only cover the unpleasant smell in the new car. , cannot remove air pollution in the car;

6. Many car owners like to put perfume in their cars to improve the smell of their new cars. They should pay attention to choosing natural materials. Many perfumes are currently chemical synthesis. It itself has a certain degree of pollution, so you must choose carefully;

7. You must be careful when using in-car air purifiers and other purifiers. At present, some manufacturers have produced some products to purify the air in the car, which can reduce the pollution in the car to a certain extent, but be sure to choose products that are effective and have few side effects;

8. If the car owner drives the new car for a while After a while, physical symptoms are discovered, such as feeling smokey in the eyes, respiratory irritation or even dizziness. If the smell cannot be completely dissipated within three months or even six months, the air quality in the car should be tested to detect and eliminate the car as soon as possible. Internal pollution sources;

9. Four categories of people should pay special attention to the hazards of pollutants in new cars: people with weak constitutions, women, children and people with allergic constitutions. These people should try to avoid driving and riding for long periods of time. New car. Studies have shown that women are particularly sensitive to the inhalation of benzene and formaldehyde. Especially long-term inhalation of benzene in pregnant women can lead to fetal development abnormalities and miscarriage.

Energy-saving knowledge

1. How to use energy-saving lamps correctly

Energy-saving lamps are energy-saving products that people often use in their homes, so how should they be used correctly? How can energy-saving lamps achieve the best energy-saving effect? ??The reporter recently learned from the National Development and Reform Commission that the following five points should be paid attention to when using energy-saving lamps correctly:

First, pay attention to the use voltage marked on the lamp. If If a low-voltage sodium lamp is used with a high-voltage power supply, the lamp will burn out.

Second, users should use brands with qualified quality and be wary of and refuse to use inferior products.

The third is to pay attention to the selection and correct use of lamp power. The light efficiency of energy-saving lamps is generally 5 times higher than that of incandescent lamps. Where 60-watt incandescent lamps were originally used, only 13-watt energy-saving lamps are now sufficient.

The fourth is to minimize the number of light switches. Every time it is switched on and off, the service life of the lamp is reduced by about 3 hours.

Fifth, after the lamp is used for a period of time, the luminous flux will drop significantly and the lamp will become darker and darker. At this time, attention should be paid to replacing new lamps in time.

2. When using gas for cooking correctly, you need to pay attention to the following six points:

1. When natural gas burns, the flame turns red and yellow, indicating a lack of oxygen, and the phenomenon of "defire" indicates that the air has passed through the gas. At this time, the stove damper can be adjusted appropriately. When the flame turns purple-blue, it means sufficient combustion.

2. When cooking, you should prepare the food before lighting the fire to avoid burning an "empty stove"; if you are making soup or stewing, boil it over high heat first, then turn down the heat and just keep Just bring the pot to a boil without overflowing.

3. When cooking, the size of the fire can be determined according to the size of the pot. It is best if the flame distribution area is flat with the bottom of the pot.

4. It is best not to use steaming when cooking. The time for steaming rice is three times that of stewing rice.

5. Wipe away the water stains on the surface of pots and kettles before putting them on the fire. This will allow heat energy to be transferred into the pot as quickly as possible and save gas.

6. If the wind blows the flames swaying, you can use a thin iron sheet to make a "windshield" to ensure the concentration of firepower.

3. Prevent home appliances from being on standby

Many people use the remote control to turn off the TV after watching the TV for convenience and everything will be fine. However, they do not know that this only puts the TV in standby mode, which still consumes a lot of money. electrical energy. The reporter learned from the Resources Department of the Hebei Provincial Development and Reform Commission that various home appliances will consume a lot of electricity if they are in standby mode for a long time.

Take a TV as an example. On average, each TV is on standby for 2 hours a day and consumes 0.02 kilowatt-hours of power. There are 350 million TV sets in my country, and the standby power consumption in a year is as high as 25.55%. 100 million degrees, equivalent to the total power generation of several large thermal power plants in a year.

In layman's terms, standby refers to turning off the remote control without turning off the electrical switch or power supply. Most of today's home appliances have a standby function. Each home appliance consumes about 10% of its power when in standby mode, about 5 to 15 watts. The total standby energy consumption of TVs, air conditioners, stereos, microwaves, etc. owned by ordinary urban residents is equivalent to turning on a 30-50 watt continuous light. According to statistical calculations, urban residents with a high penetration rate of home appliances consume 20-40 kilowatt hours of standby power per household per month.

It can be said that in daily life, behind the temporary convenience, there is waste. Therefore, everyone should try not to put home appliances in standby mode, but turn off the electrical switches or turn off the power supply completely.

Pollution in life

While modern life brings us enjoyment, it also creates pollution that harms our health. Many people often forget this when enjoying modern life and ignore various dangerous sources of pollution. Here we list several categories that are close to daily life to remind people to pay attention and pay attention.

One of the pollutions: napkins

People use napkins for hygiene reasons, but if the napkins themselves are unreliable, it will backfire.

Experts point out that since pesticides are inevitably used during the cultivation of crops, paper raw materials such as rice straw and wheat straw often contain pesticide residues. Some manufacturers also mix some recycled paper into the pulp. Although it has been decolorized, harmful substances such as aluminum and cadmium still remain in the pulp. Not all unclean matter, harmful substances, microorganisms, etc. in the recycled waste paper have been removed. Wash. In addition, the lack of scientific rigor in the production, packaging, transportation, storage, and sales of napkins is also the source of pollution. Under normal circumstances, napkins are easily contaminated by pathogenic pyogenic bacteria, Escherichia coli, fungi and hepatitis viruses, which can cause dysentery, purulent infection, hepatitis and other infectious diseases.

Pollution 2: Correction Fluid

The correction fluid often used by students currently contains substances such as methylene chloride, trichloroethane, and paraxylene, which are very easy to volatilize. Free in the air. After inhaling xylene, it can cause chronic poisoning, causing headaches, drowsiness, nausea, etc.; methylene chloride, trichloroethane, etc. damage the human nervous system, causing drowsiness, confusion, loss of appetite, slow movement, etc.

Someone once put cotton dipped in a small amount of the three reagents methylene chloride, trichloroethane and paraxylene next to two groups of mice. The group with the larger amount of reagents only lasted five minutes. The mice convulsed and died; the smaller group was tested for five to eight minutes every day. Within five days, the mice became panicked, ate less, moved slowly and lost weight. In view of this situation, scientists warn people not to use correction fluid anymore.

Pollution No. 3: Fluorescent Holders

The American "Consumer Products" magazine pointed out that most of the "fluorescent hold" children's toys produced in the United States and Taiwan, China, after being used during festivals, Discard immediately to avoid accidental injury to children.

According to this, the magazine received a complaint, and after testing, it was found that the ingredients of the fluorescent cup include dimethyl phthalate and dibutyl phthalate, which have low toxicity. If you accidentally break it, you will be exposed to it. The above-mentioned chemical substances that are leaked should be washed quickly and seek medical attention. If accidentally inhaled or touched, it may cause nausea, dizziness, paralysis or even coma.

Pollution No. 4: Fluorescent Screens

Fluorescent screens such as televisions and computers produce a harmful gas that may cause cancer, which has been confirmed by German researchers.

According to reports, this harmful gas is called brominated dibenzofuran. Tests have shown that after a TV was used continuously for three days, the content of this gas measured in the room was equivalent to the content of brominated dibenzofuran measured at an intersection. Therefore, scientists recommend that people stay as far away from the TV as possible when watching TV; the room where the TV is placed should be kept ventilated, especially after the TV has been used for many hours, the room must be ventilated for a long time. If it is a new TV This is all the more reason to do so.

Pollution No. 5: "stagnant water" in tap water

When you turn on the faucet for the first time in the morning, sometimes the tap water that flows out is often yellow. The reason why tap water turns yellow is because the "stagnant water" in the water pipes that has not flowed for a long time is contaminated by metal substances after contact with the metal pipes. According to analysis, this water contains a variety of harmful substances to the human body. It is neither drinkable nor suitable for rinsing your mouth and brushing your teeth. In addition, faucets that have been out of service overnight or used infrequently may harbor bacteria called "Legionella" under the influence of "stagnant water", which is the main culprit of acute respiratory infectious diseases.

Therefore, this "stagnant water" should be drained off in the morning, and it can only be used after clear water flows out.

Pollution No. 6: Morning Air

Many people are accustomed to opening windows immediately in the early morning, thinking that this can bring fresh air from the outside into the room. Little did they know that doing so would be counterproductive. Since 5 million tons of carbon dioxide and harmful gases are emitted into the atmosphere every day on the earth, and early morning is the peak period of air pollution, opening windows for ventilation at this time is obviously not good for the human body. Health experts tell us that the best time to open windows for ventilation is between 9:00 and 11:00 in the morning or between 14:00 and 16:00 in the afternoon, because the temperature has risen during these two periods and the countercurrent layer phenomenon has disappeared. The innocuous gases deposited in the lower layers of the atmosphere have also dissipated. At this time, it is most scientific to open windows for ventilation.

Tips on home decoration and environmental protection

1. What is home decoration and environmental protection?

Home decoration environmental protection refers to the indoor air quality index after decoration, which meets or is better than various environmental protection testing standards stipulated by the country. It mainly includes four indicators: physical, chemical, biological and radioactive.

2. What does “home decoration pollution” usually mean?

The materials used in interior decoration emit harmful and toxic pollutants, polluting the indoor environment. This kind of indoor pollution from the decoration itself is called home decoration pollution. If the content of home decoration pollutants is too high and remains unresolved for a long time, it will cause people's physical discomfort and affect their health.

3. Briefly introduce several major home decoration pollutants

According to the use of construction, decoration and furniture materials in my country, indoor home decoration pollutants mainly fall into the following categories:

Formaldehyde

Benzene series: benzene, toluene, xylene

Total volatile organic compounds (TVOC)

Free toluene diisocyanate (TDI )

Soluble lead, cadmium, chromium, mercury and other heavy metal elements

4. The sources of most home decoration pollution

There are mainly three aspects: the building itself and the decoration Materials and new furniture purchased.

Formaldehyde contaminants are present in most decorative materials and furniture. Such as: inferior artificial boards, adhesives and substandard coatings, etc.

Benzene series compounds are found in organic solvents of various building materials and various paint thinners, and are also present in large amounts in some waterproof materials that do not meet the standards.

Materials containing total volatile organic compounds (TVOC) pollution components include paint, latex paint, etc.

Toluene diisocyanate (TDI) contaminants are mostly found in polyurethane paint products.

Paints and adhesives containing heavy metal contaminated materials.

Radioactive substances such as radon are contained in marble floors and stones.

5. Are home decoration pollutants the root cause of illness?

Pollutants in home decoration can cause people to get sick, but there are many reasons why people get sick. The content of home decoration pollutants in newly renovated houses is too high and cannot meet the new national environmental protection standards. If it is not solved for a long time, it will obviously affect your health.

However, experts point out that there is still no scientific evidence that certain diseases are caused by indoor air pollution. Therefore, preventing excessive air pollution is more important and effective than pursuing responsibility afterwards.

Classification of domestic waste

Domestic waste can generally be divided into four major categories: recyclable waste, kitchen waste, hazardous waste and other waste. Currently commonly used garbage disposal methods include comprehensive utilization, sanitary landfill, incineration and composting.

1. Recyclable garbage includes paper, metal, plastic, glass, etc. Through comprehensive treatment and recycling, pollution can be reduced and resources saved. For example, every ton of waste paper recycled can make 850 kilograms of good paper, save 300 kilograms of wood, and reduce pollution by 74% compared with the same amount of production; every ton of plastic beverage bottles recycled can obtain 0.7 tons of secondary raw materials; every ton of waste paper recycled Steel can produce 0.9 tons of steel, which saves 47% of the cost compared with ore smelting, reduces air pollution by 75%, and reduces water pollution and solid waste by 97%.

2. Kitchen waste, including leftovers, bones, roots and leaves, and other food waste, can be composted on-site through biotechnology and can produce 0.3 tons of organic fertilizer per ton.

3. Hazardous waste includes waste batteries, waste fluorescent tubes, waste mercury thermometers, expired medicines, etc. These wastes require special safe handling.

4. Other garbage includes bricks, ceramics, slag, toilet paper and other difficult-to-recycle waste other than the above categories of garbage. Sanitary landfill can effectively reduce the impact on groundwater, surface water, Soil and air pollution.

Beware of the "Five Killers" in Fresh Vegetables

Killer One: Undercooked Green Beans

According to experts, green beans are also called dragon sprouts Beans contain mainly nitrites, saponins, etc. that can cause human poisoning. The main causes of poisoning are improper processing methods, insufficient heating, and undestroyed toxins. Studies have shown that cooking green beans to about 80°C will increase the toxicity in the beans. Undercooked beans are more toxic than uncooked beans. The poisoning time of kidney beans is half an hour to five hours after eating, and poisoning can occur within up to ten hours. The main symptoms of poisoning are nausea, vomiting, abdominal pain, diarrhea, dizziness, etc.

Expert tip: Cook thoroughly at high temperature. The saponin contained in green beans can destroy its toxicity when heated to 100°C or for more than 30 minutes. It must be cooked and stir-fried thoroughly during cooking and processing. It is best to use the stewing method, and boiling water must be fully heated before frying. When frying, don't stir-fry it quickly, don't be greedy for crispiness and save time. When processing green beans in a large pot, pay more attention to stir-frying evenly, cooking and simmering thoroughly, so that the green beans lose their original green color and beany smell.

Killer 2: Fresh Daylily

According to reports, fresh daylily is also called daylily. It tastes fresh and sweet. In recent years, some consumers like to buy back the freshly picked ones. Make soup and boil fresh day lily. But in fact, fresh daylilies contain the toxic component colchicine, which is oxidized into colchicine in the body, which has a strong stimulating effect on the digestive system and urinary system, and an inhibitory effect on the nervous system. Severe poisoning can damage the kidneys and cause hematuria and anuria. It can paralyze the spinal cord and brain. If ascending paralysis occurs, death will occur due to respiratory paralysis within one or two days. Clinical manifestations include nausea, vomiting, abdominal pain, etc. After eating improperly processed fresh daylilies, the disease will occur in 12 to 30 minutes or 4 to 8 hours in the elderly.

Expert tips: Fully soak in water for 30 minutes before cooking; when processing fresh day lilies, be careful not to fry them directly. They must be cooked thoroughly in boiling water, squeeze out the water after boiling, and then use clean water Rinse several times and stir-fry. Experts suggest that fresh day lily can be steamed and dried in the sun, soaked in water before eating, and then further processed for consumption.

Killer Three: Germinated Potatoes

The toxic substance in germinated potatoes is solanine, which is highly irritating and corrosive to the gastrointestinal mucosa and has central nervous system effects. Paralyzing effect. The incubation period for poisoning from eating sprouted potatoes is usually 10 minutes to several hours, with symptoms such as scratching and burning in the throat, burning or pain in the upper abdomen, followed by severe nausea, vomiting, vomiting, diarrhea, etc. In severe cases, death can occur.

Expert tips: Do not eat the sprouted parts and discolored potato flesh. If a potato has only one or two sprouts, you can pull out the buds, dig out the discolored potato flesh, and then soak it in cold water. Leave for more than half an hour to dissolve the remaining toxins in the water. If there are too many sprouts or the skin and flesh are blue and purple, they can no longer be eaten. Adding a little vinegar when frying potatoes can speed up the destruction of toxins and prevent poisoning.

Killer Four: Wild Mushrooms of Unknown Origin

There are many cases of people in Guangdong being poisoned by accidentally eating poisonous wild mushrooms. There are more than 200 kinds of toadstools in my country, and more than 100 kinds of toadstools are known in Guangdong. The toxins of poisonous wild mushrooms can damage the human nervous system and cause hallucinations, coma, and convulsions in the poisoned person. Some toxins harm the human liver and kidneys, causing fever, diarrhea, and in severe cases, hemolysis.

Expert tips: When buying edible or wild mushrooms, go to large shopping malls, or when buying at farmers' markets, buy products that are packaged and have the factory address, phone number, and brand marked on the packaging bag. Experts believe that buying artificially grown mushrooms is safer and more reliable.

Killer Five: The humble little broad bean

Bava beans are not suitable for consumption by a certain group of people. According to experts, among the people in the Hakka area of ??Guangdong, some people are born with a lack of G6PD enzyme in their blood. If they accidentally eat broad beans, it will cause hemolysis, with symptoms such as anemia, fever, and renal failure.

Expert advice: It is best to know in advance whether you are lacking G6PD enzyme in your body. You can know this by checking your blood. If you are indeed lacking G6PD enzyme, you should stay away from broad beans.

Special reminder

According to Director Dai of the Public Health Research Institute of the Guangdong Provincial Center for Disease Control and Prevention, in Guangdong, there are more cases of poisoning caused by excessive pesticides in vegetables than the vegetables themselves. There are more cases of poisoning caused by toxins. It is estimated that there are more than a dozen cases of poisoning in Guangdong every year due to eating vegetables containing excessive pesticide residues.

So, in order to ensure food safety, how do consumers handle freshly purchased vegetables? Director Dai told reporters that as an ordinary consumer, the best steps for cleaning vegetables are: first washing; second soaking, soaking for at least half an hour; third blanching, first scalding with boiling water; fourth stir-frying.

Pure drinking water is not always better

In recent years, people have put forward higher requirements for water hygiene. Distilled water, pure water, and space water are becoming commodities and entering people's lives. . Some units also supply pure water to residential areas and guide people to use this type of water as basic drinking water. In fact, this approach is inappropriate.

Water in nature is in contact with the atmosphere, soil, rocks, etc. at all times. During the contact process, some substances are dissolved or suspended in them, causing natural water to often contain various "Impurities" such as calcium, magnesium, potassium, sodium, iron, manganese, carbon, ammonia, silicon, aluminum, phosphorus and other compounds. In addition, there are many microorganisms living in natural water, such as various fungi. Many of the "impurities" in natural water are necessary for the human body, such as calcium, fluorine and other trace elements. Water is one of the main sources for the human body to obtain these trace elements.

In certain environments, such as arid and desert areas, due to insufficient drinking water, people use distilled water as a supplement, which will not have adverse effects on health. But if you use this kind of water as drinking water for a long time, it is not good for your health. After pure water enters the human body, it will also take away trace elements in the body. It can be seen that the purer the drinking water, the better. People should still drink more natural water. Of course, it should be clean water.

How to identify polluted fish

The polluted fish mentioned here mainly refers to chemical pollution. With the development of human science, technology and production, especially the widespread application of pesticides and fertilizers, the discharge of numerous industrial waste gases, wastewater and waste residues, some toxic substances, such as mercury, phenol, cyanide, organochlorine, organophosphorus, and sulfide , nitrogen compounds, fluorides, arsenides and p-nitrobenzene, etc., are mixed in the soil and air, and are continuously injected into fish ponds, rivers or lakes, or even directly into the water system, causing large-scale water pollution and causing fish be harmed. Contaminated fish may have a foul smell and develop deformities; or they may die. When people accidentally eat contaminated fish, toxic substances will be transferred to the human body and gradually accumulate in the human body, causing diseases. For example, organic pesticides can cause developmental delays, low intelligence, and susceptibility to dwarfism in children; heavy metal salts can cause joint pain and cancer. Some substances are more toxic and more harmful to human health.

1. Deformity

The important characteristic of contaminated fish is deformity. Because fishermen are very familiar with the body shapes of various fish, it is not difficult to identify them as long as they observe carefully. Polluted fish tend to have shorter and taller bodies, with the back of the base of the dorsal fin bulging, the base of the starting point of the anal fin protruding, and the vertical distance from the starting point of the anal fin to the base of the dorsal fin increasing; the dorsal fin is shorter, the fin rays are tight, and the pelvic fin is slender; the pectoral fin generally exceeds the base of the pelvic fin; The scales above the base of the anal fin are tightly arranged and irregularly arranged; the lateral line of the fish body is irregularly curved at the rear of the body. In severe cases, the rear part of the fish body is uneven, and the lateral line behind the starting point of the anal fin disappears. Another important feature is that most polluted fish have fins that are crispy and break when touched, making them the easiest to identify.

2. Fish containing phenol

The fish has prominent eyes, a sallow body color, and dull scales. When the gill cover is opened, a distinct smell of kerosene can be smelled. When cooking, even if heavy condiments are used to cover it, it will still taste pungent and unpleasant, numbing the mouth and making people feel nauseous. Fish contaminated with phenol should not be eaten.

3. Fish containing benzene

The fish body is dull and the eyes are protruding. When the gill cover is opened, there is a strong smell of "666" powder. It is still pungent and astringent after being cooked. Fish containing benzene is more toxic than fish containing phenol and should not be eaten.

4. Fish containing mercury

Fish eyes generally do not protrude. The body of the fish is gray and dull. The muscles tighten and become hard when pressed. Open the gill cover and you can't smell any peculiar smell. After high-temperature heating, part or most of the mercury can be volatilized, but there is still a lot of mercury toxin remaining in the fish and it is not suitable for consumption.

5. Fish containing phosphorus and chlorine

The eyes of the fish are protruding, the scales are loosened, and the fish body is swollen. When the gill cover is opened, a spicy smell can be smelled, and the gill filaments It is covered with mucus and blood. If you press it with your hands, bloody pus will spurt out, and you will feel numb at the entrance. Fish contaminated with phosphorus and chlorine should be avoided.

Eating contaminated fish may cause chronic poisoning, acute poisoning, or even induce various diseases, including teratogenesis and cancer. If you find symptoms of poisoning, you should go to the hospital for diagnosis and treatment in time.

How harmful are preservatives?

Preservatives are the most controversial among all types of food additives. Preservatives are needed to preserve food for a long time, and people’s use of preservatives is unclear. There is concern. How are preservatives used in common foods? What kind of safety risks will it pose to consumers? The China Consumers Association recently issued Consumer Warning No. 2 of 2001, pointing out that "preservatives" in food are related to health.

■What are preservatives? According to experts, preservatives are food additives used to maintain the original quality and nutritional value of food. It can inhibit microbial activity, prevent food from spoilage and extend the shelf life.

■Are preservatives harmful to the human body? Since most of the preservatives currently used are artificially synthesized, excessive use will cause certain damage to the human body.

Therefore, my country has strict regulations on the use of preservatives, and it is clear that preservatives should meet the following standards: 1. Harmless to human health when used rationally; 2. Do not affect the flora of the digestive tract; 3. Can be degraded into food in the digestive tract Normal ingredients; 4. Does not affect the use of pharmaceutical antibiotics; 5. Does not produce harmful ingredients during heat treatment of food.

■What are the food preservatives approved in my country? So far, my country has only approved 32 types of food preservatives that are allowed to be used, among which the most commonly used ones are benzoic acid, sorbic acid, etc. Benzoic acid is more toxic than sorbic acid, and its antibacterial effect is only 1/3 of sorbic acid at the same acidity value. Therefore, many countries have gradually switched to sorbic acid. However, due to the low price of benzoic acid and its sodium salt, it is still used as the main preservative in my country, mainly in carbonated drinks and fruit juices. Sorbic acid and its salts have strong antibacterial power and low toxicity. They are unsaturated fatty acids that can participate in the normal metabolism of the human body and are converted to produce carbon dioxide and water. Due to its good preservative effect, sorbic acid has no adverse effect on the taste of food. , has become increasingly popular. In addition, judging from the development trend of preservatives in the future, natural preservatives will become the protagonist of development.

■ Is "This product does not contain any preservatives" credible? After some manufacturers add preservatives to food, they do not indicate the use of preservatives on the label because they are afraid that consumers will have doubts; some even use preservatives and advertise on the packaging that "this product does not contain any preservatives." , in order to mislead and deceive consumers, seriously infringing on consumers' right to know. According to the test results of a recent comparative test of 121 canned carbonated drinks conducted by the China Consumers Association, 7 types of drinks use preservatives but are not marked on the label, accounting for 8% of the total number of drinks containing preservatives tested.

■How to correctly understand preservatives in food? Consumers should view preservatives rationally and make it clear that in addition to preventing food deterioration, preservatives can sometimes prevent food poisoning, which is undoubtedly beneficial to consumers' safe consumption. However, preservatives are artificially synthesized and may cause serious health problems if used improperly. There are certain side effects, and long-term excessive intake will cause certain damage to consumers' health. Children, pregnant women and other special groups who are in a special period of physical development should focus on protecting their food intake. It is recommended not to feed them foods that use too many preservatives.

■ Call on government management departments to intensify the crackdown on illegal abuse of preservatives, continuously improve laws and regulations on synthetic additives, especially preservatives, and control the production and use of preservatives to the most reasonable level. within the range. Make more detailed provisions on labeling, such as requiring food manufacturers to clearly indicate "Contains preservatives: XXX, XXX" on product labels, and indicate the dosage used, so that consumers can clearly understand when purchasing Objective and clear judgment.

"Green food" may not necessarily be "purely natural"

In the minds of ordinary consumers, green food must be pure natural and free of chemical fertilizers and pesticides

. But experts say that's not the case.

Chen Dawei, an expert from the China Environmental Labeling Product Certification Committee, said: "Developed countries do not have green food certification, and the so-called green food certified in China is not purely natural food."

"Ten Before the National Day, more than 80 kinds of agricultural products with the "Green A" logo appeared on the Beijing market, with the slogan "purely natural, pollution-free". Chen Dawei believes that green food certified by the Ministry of Agriculture should be accurately called "safe food." This type of agricultural products is not pollution-free, but the pollutants do not exceed the prescribed standards. Developed countries have a strict set of pollutant standards for agricultural products. Only when all indicators meet the standards will they be allowed to be put on the market. Some domestic green products actually implement some of the most basic international safety standards, which are by no means high standards. They only mean that the chemical substances in their products are within acceptable limits.

Which plastic bags are toxic?

The food bags on the market can be used to hold dry, wet, raw and cooked food, and are safe and non-toxic. The plastic bags used to package food in food factories and preserves factories are of course non-toxic. Plastic bags used to package daily necessities, clothes, footwear, electrical appliances, and hardware parts may be toxic and should not be used to hold food.

Non-toxic plastic bags are generally made of polyethylene, while toxic plastic bags are made of polyvinyl chloride. Because polyvinyl chloride resin contains unpolymerized vinyl chloride monomer, which is a compound that is toxic to the human body. Furthermore, during the process of processing polyvinyl chloride resin into plastic bags, some auxiliary materials such as plasticizers, stabilizers, and pigments must be added. Some auxiliary materials are toxic. These toxic substances are easily contaminated during use. Extracting the oil or water from food and eating it together will be harmful to human health.

Polyvinyl chloride resin itself is non-toxic. If the free vinyl chloride monomer is reduced to a very small amount when producing PVC resin, and non-toxic auxiliary materials are strictly selected when making the finished product, non-toxic PVC plastic can be made. bag.

It is generally difficult to distinguish between polyethylene plastic bags and polyvinyl chloride plastic bags. It can be easily identified by burning. Polyethylene can burn, the flame is blue, the upper end is yellow, and it emits the smell of paraffin when burning; PVC is extremely difficult to burn, it is yellow on fire, green on the outside, and emits the pungent smell of hydrochloric acid.

Whether plastic bags are toxic during use is also related to the method of use.

Some food bags have trademarks and other characters printed on the outside. It is unsafe to turn the food bag over when using it and allow the food to be stained with these pigments.