Many patients with lead poisoning admitted to the Poisoning Department drink acidic drinks in crystal glass containers.
There are two kinds of crystal glass containers in circulation in the market: lead-free crystal glass and lead-containing crystal glass. The former generally contains potassium, mostly high-grade handicrafts and marked on the outer packaging; The latter contains lead, that is, crystal glassware common in some supermarkets and stalls, and its lead oxide content can reach 24%.
In daily life, if the cup made of artificial crystal containing lead is filled with acid drinks such as alcohol, cola, honey, fruit juice or other acid foods, lead ions may form soluble lead salts, which will be ingested by the human body with the drinks or foods, seriously endangering health. According to Professor Zhu, lead mostly passes through the blood-brain barrier in the form of free or inorganic compounds, which is harmful to the vascular-rich central nervous system-hippocampus and cerebral cortex. When the blood lead concentration reaches 30 μ g/L, women will have neurotoxic reactions such as general weakness, dizziness, headache, anemia, memory loss, muscle and joint pain, constipation and irregular menstruation. Symptoms such as arteriosclerosis, digestive tract ulcer and fundus hemorrhage are also related to lead pollution. When the blood lead level is high, the patient's mouth has a metallic taste, and the water in the patient's blood vessels penetrates into the brain stroma, which will lead to brain edema, cerebral hemorrhage, demyelination and other diseases. Long-term intake of lead and its compounds, excessive lead will be deposited in bones, burying hidden dangers of fractures.
However, early lead poisoning is often difficult to find, especially when long-term use of lead-containing glassware to drink acidic drinks leads to long-term chronic poisoning, but it is misdiagnosed because there is no obvious lead exposure history. When people use lead-containing glassware in daily life, they should try to avoid holding acidic drinks or food, and it is best to use ordinary glassware. If possible, it is safer and more reliable to use lead-free crystal glass as wine glasses and kitchen utensils.
So how to identify whether there is lead?
Crystal glass, including crystal bottom, all-crystal, vacuum-insulated double-layer crystal glass, nano-molecular crystal glass, ordinary white glass and high-white glass. According to the price level, it is not easy to buy a glass with a crystal bottom of 20-30 unless the seller retails at the wholesale price. Not to mention all-crystal. As for some crystal glasses bought for 20 yuan, they should be thrown away. The lead content must be around 20%, 10 yuan can be ignored. There is another way to determine the pros and cons. Smell it. If the crystal glass you buy has a pungent smell and will not disappear after a long time, try not to use it. Although the low-grade crystal cup sometimes smells, it disappears after washing, which shows whether it is the smell of the cup itself. Youdeli Cup Industry Suggestions:
Be careful when buying crystal glasses, beware of crystal glasses containing lead!
Precautions for glass purchase teach you to identify whether glass contains lead.
Glass is divided into ordinary glass and crystal glass, and crystal glass is divided into lead-free crystal glass and lead-containing crystal glass. So how do we identify lead-free glasses?
The method is actually very simple. We can distinguish lead-containing glass from lead-free glass by looking at weight, logo, color and heat resistance.
How to identify lead-free glass
1, look at the logo: lead-free glass generally contains potassium, mostly high-grade handicrafts and has a logo on the outer packaging; Lead-containing glass contains lead, which is a common crystal glassware in some supermarkets and stalls, and its lead oxide content can reach 24%.
2, look at the color: lead-free glass has better refraction than traditional lead-containing crystal glass, which perfectly shows the refraction performance of metallic glass; For example, some ornaments of various shapes, crystal wine glasses, crystal lamps and so on. It is made of lead-containing glass.
3, look at heat resistance: glasses can generally withstand high temperatures, but generally have poor resistance to extreme cold and extreme heat. Lead-free crystal glass is a kind of glass with high expansion coefficient, and its extreme cold resistance and heat resistance are worse. If you make tea with boiling water in an extremely cold lead-free glass, it will burst easily.
4. Weight: Compared with lead-free crystal glass products, lead-containing crystal glass products are slightly heavier.
5. Listening to the sound: Beyond the metallic sound made by lead-containing crystal glass, the sound of lead-free glass is better, and it is known as the "music" cup.
6, look at toughness: lead-free glass is more toughness than lead-containing crystal glass, that is, impact resistance.
The national standard for lead-free crystal glass has not yet been formulated.
At present, there is no national standard for crystal glass in China, so many enterprises are producing according to EU standards.
In EU standards, crystal glass is divided into lead-free, lead-containing and high lead. The lead oxide content of lead glass reaches 24%; The lead oxide content of high lead glass reaches 36%.
If crystal glass containers are produced according to EU standards, no matter what kind of products and the lead content, there are strict regulations in the world, which should be safe for human body. However, due to the lack of domestic standards, it is not excluded that individual manufacturers produce at will, and the product quality is difficult to guarantee.
Therefore, it is suggested that when using lead-containing glassware in daily life, acidic drinks or food should be avoided as much as possible, and it is best to use ordinary glasses. If possible, it is safer and more reliable to use lead-free crystal glass as wine glasses and kitchen utensils.