LEAD (addendum)

摘要

Lead (Pb) occurs in Earth's crust primarily as the mineral galena (lead(ll) sulfide) and, to a lesser extent, as anglesite (lead(ll) sulfate) and cerussite (lead carbonate). It occurs in the environment both naturally and, to a greater extent, from anthropogenic activities such as mining and smelting, battery manufacturing and the use of leaded petrol (gasoline). Lead contamination of food arises mainly from the environment or from food processing, food handling and food packaging. Atmospheric lead can contaminate food through deposition on agricultural crops. Water is another source of lead contamination of food. Although lead exists in both organic and inorganic forms, only inorganic lead has been detected in food.