Kinetics and mechanism of amitraz hydrolysis in aqueous media by HPLC and GC-MS.
Degradation processes of amitraz in aqueous media have been studied by spectrophotometry, HPLC and GC-MS. Amitraz undergoes hydrolysis reactions at any pH, but towards the acidic pH range hydrolysis proceeds at a faster rate. Depending on the pH value, different products of the hydrolysis have been identified. The main degradation products are 2,4-dimethylaniline at very acidic pH values (pH<3), N-(2,4-dimethylphenyl)-N'-methylformamidine and 2,4-dimethylphenylformamide at less acidic media (pH 3-6) and 2,4-dimethylphenylformamide at basic pH. The mechanisms of the different hydrolysis processes have been elucidated.
Corta
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Department of Analytical Chemistry, Faculty of Sciences, University of the Basque Country, P.O. Box 644, 48080 Bibao, Spain.
Bakkali
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Berrueta
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Gallo
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B
Vicente
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