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Effect of post-harvest storage and house hold processing on reduction of human health risk index of pesticide in tomato

M.Alamgir Zaman Chowdhury, M.Saiful Islam, Nurul Karim, M.Mijanur Rahman, M.Abdur Rahman, M.K.Alam, A.N.M.Fakhruddin

Evaluation of post-harvest storage time with different household processes like washing and boiling/cooking on residual levels of cypermethrin, chlorpyrifos and diazinon in tomato was carried out. Three plots of tomato crop were sprayed separately with cypermethrin (10 EC; 20 ml/acre), chlorpyrifos (20 EC; 120 ml/acre) and diazinon (60 EC; 412.8 ml/acre) at a recommended dose.After treatment, the post- harvest tomato samples were subjected to house hold processings (washing and boiling/cooking) at zero day and 3rd day. Pesticide residues were extracted from tomato by solvent partitioning and cleaned up through florisil column chromatography. Cleaned samples were analyzed by HPLC equipped with PDA detector. Both washing and cooking reduced human risk index value ~12%-69% for chlorpyrifos, ~9-43% for cypermethrin and ~47-90% for diazinon on zero days. During 3 day of storage, washing and cooking reduced human risk index value ~26%-84%for chlorpyrifos, ~11-53%for cypermethrin and ~46- 95%for diazinon.Moreover, boilingwas foundmore effective thanwashing in reducing residual levels of pesticides.