Pesticide residues are a general term for trace amounts of pesticides, toxic metabolites, degradants and impurities that have not been decomposed and remain in organisms, harvests, soils, water, and the atmosphere for a period of time after use. It is a phenomenon in which some pesticides directly or indirectly remain in grains, vegetables, fruits, animal products, aquatic products, soils and water bodies after pesticides are applied in agricultural production.
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The problem of pesticide residues is caused by the mass production and widespread use of pesticides. Some pesticides applied to crops, some of which are attached to crops, some are scattered in the environment of soil, atmosphere and water, and some of the pesticides left in the environment are absorbed by plants. Residual pesticides are directly passed to the human or animal body through plant fruits or water, the atmosphere, or finally passed to people and animals through the environment and food chain. A large number of pesticides, especially organic pesticides, cause serious pesticide pollution problems and become a serious threat to human health. 
The meaning of pesticide residues