Determination and study on dissipation and residue of bismerthiazol and its metabolite in Chinese cabbage and soil.
A simple and accurate method for the determination of bismerthiazol and its metabolite 2-amino-5-mercapto-1,3,4-thiadiazole was developed in Chinese cabbage and soil by high-performance liquid chromatography-diode array detection in this study. The limits of detection were 0.06 mg/kg for bismerthiazol and 0.03 mg/kg for 2-amino-5-mercapto-1,3,4-thiadiazole, respectively. Recoveries of cabbage and soil were investigated at three spiking levels and were in the range of 84.0-96.0% for bismerthiazol and 71.0-74.6% for 2-amino-5-mercapto-1,3,4-thiadiazole, with relative standard deviations below 7.0%. For field experiments, the half-life of bismerthiazol was 2.4-2.5 days in Chinese cabbage and 2.5-4.8 days in soil at the two experimental locations in China. Dissipation residues of 2-amino-5-mercapto-1,3,4-thiadiazole were lower than 0.72 mg/kg. Terminal residues of bismerthiazol and its metabolite were less than 3.0 and 0.3 mg/kg in Chinese cabbage, respectively. No bismerthiazol or metabolite residues were detected in soil on days 5, 7, 10, and 14 after the last spraying at the two dosage levels.
College of Science, China Agricultural University, Beijing, 100193, People's Republic of China.
Junxue
J
Wu
Hongyan
H
Zhang
Kai
K
Wang
Chengju
C
Wang
D001937:Brassica / Q000737:chemistry*; D002681:China; D004784:Environmental Monitoring; D005659:Fungicides, Industrial / Q000032:analysis*; D006207:Half-Life; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D013830:Thiadiazoles / Q000032:analysis*
D005659:Fungicides, Industrial; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D013830:Thiadiazoles; C538720:bismerthlazol