Chlormequat residues and dissipation rates in cotton crops and soil.
A simple and reliable analytical method for chlormequat residues in cotton and soil was established in this study. The residual levels and dissipation rates of chlormequat in cotton crops and soil were determined by High Performance Liquid Chromatography-Mass Spectroscopy (HPLC-MS). The limit of quantification (LOQ) was 0.05, 0.1, 0.1mg/kg for soil, cotton seeds and cotton leaves, respectively. The mean half-life of chlormequat was 4.47 days in cotton plants and was 4.34 days in soil. The final residues of chlormequat in cotton seeds were below 0.5mg/kg (the MRL of China), while the chlormequat residues could not be detected in soil. Low residues in cotton seed and soil suggest that this pesticide may be safe to use under the recommended dosage.
Guo
Xing-li
XL
China Agricultural University, College of Science, Beijing 100193, China.
Xu
Yan-jun
YJ
Zhang
Fan-hua
FH
Yu
Shuang
S
Han
Li-jun
LJ
Jiang
Shu-ren
SR
D002716:Chlormequat / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D003368:Gossypium / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D053719:Tandem Mass Spectrometry
D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D002716:Chlormequat