Remove Lead from Food

Lead is an environmental heavy metal pollutant widely distributed in nature. Soil, air and water all contain certain amount of lead to varying degrees, form which the lead can also enter our food.

One of the costs of economic development around the world is environmental pollution. The lead in food is mainly brought into food raw materials by environmental pollution, so that it is absorbed into the body through diet. Therefore, the excessive lead in food is mainly because the production enterprises are not strict to the raw materials, the use of raw materials with excessive lead. And of course, the possibility of transferring from the production equipment into the food can not be ruled out.

When lead and its compounds enter the body, they will cause harm to nervous, hematopoietic, digestive, renal, cardiovascular and endocrine systems, and lead poisoning may occur if the amount is too high. Therefore, in some developed countries, there are clear rules on the amount of lead in some articles. For example, in the United States, children's products must contain no more than 100 ppm of lead; paint or other surface coating shall not contain more than 90 ppm of lead; lead content in leather shall not exceed 300 ppm; ethylene plastics shall not contain more than 200 ppm of lead. The lead content in other materials shall not exceed 300 ppm (except crystal) etc. "The guidelines for lead poisoning in children in developingg countries" (1982) state that a blood lead level of 100ug /L or more is a diagnosis of lead poisoning.

Therefore, removing lead from food is crucial. General lead removal methods include oxidation, co-precipitation, adsorption, reverse osmosis, etc. Unlike traditional adsorption materials (resin, activated carbon), Si-novation functional silica material has multi-functional groups that can effectively adsorb and remove lead and can be reused.

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