1. silver chloride titration: this method is a common method to determine the salt content in food. The principle is to use silver chloride to react with chloride ion to generate precipitation, and determine the salt content in food by titration. The specific operation steps are as follows: take a certain amount of food samples, add an appropriate amount of water to dissolve them, add silver chloride reagent to react with chloride ions in the samples to generate precipitates, titrate the silver chloride reagent until the precipitates disappear, record the dripping amount, and finally calculate the salt content in the samples according to the dripping amount.

2. Conductivity method: Conductivity method is a method to determine the salt content in food by using conductivity. The principle is that the higher the salt content, the higher the electrical conductivity in food. The specific operation steps include: taking a certain amount of food samples, adding a proper amount of water to dissolve them, inserting a conductivity meter into the samples to record the conductivity, and finally calculating the salt content in the samples according to the conductivity.

3. Food Salinity Meter: This is a device that can measure the salt content in food. It can not only measure the temperature of food, but also be used for multiple purposes. It can be used to detect the salinity of stews, marinades, sauces, salt water and so on. In home cooking, it can also be used to control the products in restaurants, thus reducing the cost of rework. Generally speaking, the salinity of stew is controlled at 0.8%~ 1.2%, and the salinity of brine is controlled at 1.2%~ 1.6%. In addition, it can also be used in aquaculture, pharmaceutical preparations, industrial production and other fields. This kind of equipment usually has the function of quick response and large-screen digital display, and can easily judge the salt content.

All the above methods can detect the salt in food, and the choice of which method mainly depends on the specific situation and needs. If accurate measurement results are needed, it is recommended to use professional laboratory equipment.