Hydrolytic degradation of azimsulfuron, sulfonylurea herbicide

被引:44
作者
Boschin, Giovanna [1 ]
D'Agostina, Alessandra [1 ]
Antonioni, Cristina [1 ]
Locati, Daniela [1 ]
Arnoldi, Anna [1 ]
机构
[1] Univ Milan, Lab Food Chem & Mass Spectrometry, Dept Agri Food Mol Sci, I-20133 Milan, Italy
关键词
azimsulfuron; sulfonylurea herbicides; chemical hydrolysis; LC-ESI-MS;
D O I
10.1016/j.chemosphere.2007.01.036
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The chemical degradation of the herbicide azimsulfuron was investigated in aqueous solutions at different pH values. The hydrolysis rate, determined by HPLC analyses, was pH dependent and was much faster in acidic than in neutral or weakly basic conditions. The metabolites formed at different pH values were compared with standards when possible or isolated and identified using ESI-LC-MS/MS, H-1 NMR and C-13 NMR. The two main products of hydrolysis in mild acidic solution were identified as 2-amino-4,6-dimethoxy-pyrimidine and 2-methyl-4-(2-methyl-2H-tetrazol-5-yl)-2H-pyrazole-3-sulfonamide, both produced as a result of the sulfonylurea bridge cleavage. Under basic conditions, a new product, a substituted 2-pyrimidinamine, deriving from the contraction of the sulfonylurea bridge, was isolated and completely characterized for the first time. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1312 / 1317
页数:6
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