Abstract:
: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, (1)H NMR and (13)C 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.
journal_name
Chemospherejournal_title
Chemosphereauthors
Boschin G,D'Agostina A,Antonioni C,Locati D,Arnoldi Adoi
10.1016/j.chemosphere.2007.01.036subject
Has Abstractpub_date
2007-07-01 00:00:00pages
1312-7issue
7eissn
0045-6535issn
1879-1298pii
S0045-6535(07)00141-5journal_volume
68pub_type
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