This study investigates residue behavior of beta-cypermethrin (�-CYP) after spraying in cabbage. This data adds important information for an evaluation dietary intake of �-CYP residues. Two independent field trials were carried out in 2011 at two trial sites located in Beijing and Anhui Province China, respectively. An analytical method for the determination �-CYP residue in cabbage and soil samples was developed using gas chromatography coupled with micro-cell electron capture detection. The accuracy was evaluated in terms of recoveries which were in the range of 74.8% to 97.6% with relative standard deviation (RSD) of 8.1% - 11.7%. The limit of quantification (LOQ) was 0.02 mg kg-1 for cabbage and 0.005 mg kg-1 for soil, at a signal-to-noise of 10. This method was applied for the characterizing the residue behavior of �-CYP after spraying under field conditions. In order to study the dissipation rate of �-CYP under open field conditions, the residue concentration was determined in cabbage and soil samples at different interval times. The initial deposition of �-CYP in cabbage plants grown in Beijing was 2.043 mg kg-1; the estimated half-life was about 3.3 d with the determination of coefficient R2 at 0.7861. However, the initial deposition of �-CYP in cabbage plants cultivated in Anhui province was 1.594 mg kg-1; the estimated half-life was about 4.6 d with the coefficient of determination R2 at 0.9317. The highest concentration of �-CYP found in cabbage plant was 0.221 mg kg-1 after 3 days. The Chinese government has set maximum residue limits (MRL) of CYP in cabbage at 5 mg kg-1 which suggest that if the residue in cabbage were lower than 5 mg kg-1, the risk of CYP in food possess to consumers will be acceptable.

Dissipation and residues of �-cypermethrin in cabbage and oil under field conditions

248th National Meeting (2014)

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