Dissipation and residues of N-(2-bromophenyl)-2-(4,6-dimethoxypyrimidin-2-yloxy)benzylamine residues in rape and soil under field conditions.
N-(2-Bromophenyl)-2-(4,6-dimethoxypyrimidin-2-yloxy)benzylamine, compound A, is a highly active herbicide. Field trials indicate that it controls major weeds with a good tolerance on rape by postemergence application. In the present study, it was studied the dissipation behavior of compound A residues in rapes and soils. Analyses were carried out using high performance-liquid chromatography with diode array detection. The limits of detections (LOD) of compound A in rape plant and rape seed samples were 0.03 mg kg(-1) and its in soil was 0.02 mg kg(-1). At three different spiking levels mean recoveries and relative standard deviation (RSD) from spiked samples in five replicated experiment for each matrix were in the range 87.3%-96.4% and 2.9%-8.7%, respectively. The dissipation rate was found to vary with the nature of the studied sample. In soil, half-live were 33 and 25 days in Yunnan and Zhejiang, respectively, while in rape, it was 7.2 and 8.5 days. The residual amounts of compound A in rape and soil samples were below LOD after the recommended dosage and two times dosage. According to the calculation of the ADI of compound A and other data, the result suggest that the MRL for compound A in rape is 1 mg kg(-1).
Liu
Dan
D
Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, China. dliu@cau.edu.cn
Qin
Dongmei
D
Ji
Ran
R
D001596:Benzylamines / Q000737:chemistry*; D001673:Biodegradation, Environmental; D029741:Brassica rapa / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D007700:Kinetics; D011743:Pyrimidines / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility
D001596:Benzylamines; C513547:N-(2-bromophenyl)-2-(4,6-dimethoxypyrimidin-2-yloxy)benzylamine; D011743:Pyrimidines; D012987:Soil; D012989:Soil Pollutants