Analysis on Residue Dynamics of Cyhalothrin in Cabbage and Soil

A field experiment was conducted to reveal residue dynamics of cyhalothrin in cabbage and soil.The residues of cyhalothrin in cabbage and soil were determined by gas chromatography with ECD detector.The average recoveries of cyhalothrin were from 91.03% to 94.39% in cabbage and from 88.72% to 91.70% in soil.The results showed that the cyhalothrin dispelled rapidly in cabbage and soil.The half-life of cyhalothrin were from 5.53 to 7.37 days and from 3.09 to 7.15 days in cabbage and in soil,respectively.When the cabbage was sprayed three times with cyhalothrin EW,and the last application was done 7 days before harvesting,the final residues of cyhalothrin in cabbage was lower than 0.2 mg/kg,demonstrating that it is safe to apply cyhalothrin to cabbage with the recommended rate.