Removal of Two Pesticide Residues on Spinach by Several Home Processing Procedures

The chlorpyrifos and cyhalothrin residues on spinach were determined after home processing procedures.The different processing methods were compared.The results showed that rinsing with clear water could only remove 19.09% of chlorpyrifos and 9.66% of cyhalothrin,and waterlogging for 10 min could eliminate 70% of chlorpyrifos but 20% of cyhalothrin.Increasing waterlogging time couldn't increase the eliminating rate for both of the pesticides.Waterlogging with boiling water for 1 min could get rid of more than 50% of chlorpyrifos and 20% of cyhalothrin.Three detergents were tested and the removal effects were not satisfying.Cooking is the best way to remove the pesticide residues on the vegetable with eliminating rate of more than 50% for the two pesticides.The daily intake(ng·kg-1·d-1) of the pesticides can be estimated according to the residue levels of pesticides on the vegetables together with the amount of vegetables consumed,and the potential risk consuming the polluted vegetables could be assessed.The assessment result showed that the acceptable daily intuke(ADI) of the pesticides in eastern countries were higher than those in western countries.It's found that the ADI of chlorpyrifos was higher than that of cyhalothrin.