Monitoring of pesticide residues in a cotton crop soil |
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Authors: | L C Luchini T B Peres M M de Andréa |
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Institution: | Institute Biológico , Centra de Prote??o Ambiental , Av. Conselheiro Rodrigues Alves, 1252 CEP ‐ 04014–002, S?o Paulo, SP, Brazil |
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Abstract: | Abstract This paper reports on the residues of methyl parathion (O,O‐dimethyl O‐4‐nitrophenyl phosphorothioate), trifluralin (α, α, α‐trifluoro‐2, 6‐dinitro‐N, N‐dipropyl‐p‐toluidine), endosulfan (1, 4, 5, 6, 7, 7‐hexachloro‐8, 9, 10‐trinorborn‐5‐en‐2, 3‐ylenebismethylene) sulfite] and dimethoate (O, O‐dimethyl S‐methylcarbamoylmethyl phosphorodithioate) in a cotton crop soil. Soil samples (0–15 cm) were collected at different periods from the cotton crop farm and subjected to Soxhlet extraction. The extracted material was analysed after clean‐up by a HP5890 II gas Chromatograph equipped with a 63Ni electron‐capture detector (ECD‐63Ni) and fitted with a 25m x 0,2mm i.d. fused silica capillary column Ultra‐2 (5% phenylmethyl polysiloxane)]. The recoveries of the pesticide residues from the spiked control soil were determined after Soxhlet extraction and C18 cartridges clean‐up by using radiotracer techniques with the corresponding 14C‐pesticides. The results show that in the cotton crop soil the pesticide residues under study were present in the range of 0.1 to 0.4 mg ? kg‐1. Endosulfan was found to be rapidly degraded in the soil and formed a sulfate metabolite. |
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Keywords: | Multiresidue analysis clean up recovery pesticides soil |
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