Persistence and metabolism of carbofuran in the soil and sugarcane plant

摘要

Persistence and metabolism of carbofuran in the soil and sugarcane plant were studied under tropical sugarcane ecosystem. Residues of carbofuran and its metabolites in the soil, sugarcane leaf, and juice were determined by employing matrix-specific sample preparation methods and gas chromatography equipped with mass spectrometry. The recoveries of carbofuran, 3-keto carbofuran, and 3-hydroxy carbofuran were in the range of 88.75 +/- 2.58-100.25 +/- 2.38, 90.38 +/- 2.61-98.24 +/- 4.78, and 89.25 +/- 3.11-98.10 +/- 3.19%, respectively, at three levels of fortification across the three matrices involved in the study. At recommended dose (carbofuran 3% CG at 2 kg a.i./ha), the initial deposit of carbofuran in the soil was 14.390 +/- 1.727 mu g/g. The total residues comprising both carbofuran and 3-hydroxy carbofuran were detected up to 105 days after treatment with the half-life of 10.83 days. The parent compound and its metabolite were detected and quantified in the sugarcane plant (leaves and juice) from 14 days after application of carbofuran in the soil. The total residues (carbofuran and 3-hydroxy carbofuran) were detected in the leaves and cane juice up to 75 and 30 days after treatment, respectively.