QuEChERS procedure and acetonitrile extraction, oscillation and ultrasonic procedure followed by GC–MS and LC–MS/MS (QqQ) detections were established for determination of diethyl aminoethyl hexanoate (DA-6) residues in pakchoi, cotton leaf, cotton seed and soil. At concentration levels of 0.005–1 mg kg−1, recoveries were in the range of 80.5%–103.3%, with a RSD less than 14.2%. The LOQs of methods were 0.005, 0.003, 0.005 and 0.001 mg kg−1 for the pakchoi, cotton leaf, soil and cotton seed samples, respectively. DA-6 was applied in supervised field trials at GAP conditions to pakchoi and cotton. It was found that the dissipation half-lives of DA-6 were 5.4–8.2 days and 1.1–2.2 days and 1.5–1.9 days in cotton crop, pakchoi and soil respectively. At harvest, no detectable residues (<LOD) were found in cotton samples. However, residues was detected in pakchoi (0.007–0.013 mg/kg) in Beijing and soil (0.008–0.014 mg/kg) in Changsha in 2008.
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This study was supported by Program for Science Research for the 11th Five-year Plan (No.2009BADB7B03-6), P. R. China.
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Jiang, Y., Jiang, Y., He, S. et al. Dissipation of Diethyl Aminoethyl Hexanoate (DA-6) Residues in Pakchoi, Cotton Crops and Soil. Bull Environ Contam Toxicol 88, 533–537 (2012). https://doi.org/10.1007/s00128-012-0565-3
- Diethyl aminoethyl hexanoate