Studies on degradation of glyphosate by several oxidative chemical processes: Ozonation, photolysis and heterogeneous photocatalysis

MARCIA R. ASSALIN; SANDRA G. DE MORAES; SONIA C. N. QUEIROZ; VERA L. FERRACINI; NELSON DURAN

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Studies on degradation of glyphosate by several oxidative chemical processes: Ozonation, photolysis and heterogeneous photocatalysis

机译：草甘膦通过几种氧化化学方法降解的研究：臭氧化，光解和非均相光催化

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Several different Advanced Oxidation Processes (AOPs) including ozonation at pH 6.5 and 10, photolysis and heterogeneous photocatalysis using TiO_2 as semiconductor and dissolved oxygen as electron acceptor were applied to study the degradation of glyphosate (N-phosphonomethyl glycine) in water. The degree of glyphosate degradation, the reactions kinetic and the formation of the major metabolite, aminomethyl phosphonic acid (AMPA), were evaluated. Ozonation at pH 10 resulted in the maximum mineralization of glyphosate. It was observed that under the experimental conditions used in this study the degradation of glyphosate followed the first-order kinetics. The half-life obtained for glyphosate degradation in the O_3/pH 10 process was 1.8 minutes.

机译：应用几种不同的高级氧化工艺（AOP），包括在pH 6.5和10的条件下进行臭氧氧化，以TiO_2为半导体和溶解氧作为电子受体的光解和非均相光催化，以研究草甘膦（N-膦酰基甲基甘氨酸）在水中的降解。评估了草甘膦的降解程度，反应动力学和主要代谢产物氨甲基膦酸（AMPA）的形成。 pH为10的臭氧作用导致草甘膦的最大矿化作用。据观察，在本研究中使用的实验条件下，草甘膦的降解遵循一级动力学。在O_3 / pH 10过程中草甘膦降解获得的半衰期为1.8分钟。

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来源
《Journal of environmental science and health》 |2010年第1期|89-94|共6页
作者
MARCIA R. ASSALIN; SANDRA G. DE MORAES; SONIA C. N. QUEIROZ; VERA L. FERRACINI; NELSON DURAN;
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作者单位

Empresa Brasileira de Pesquisa Agropecuaria - CNPMA - Rodovia SP 340 - Km 127,5 CP 69 Jaguariuna - SP - Brazil;

Instituto de Quimica da Unicamp-Campinas-SP-Brazil;

Laboratorio de Residuos e Contaminantes-Embrapa Meio Ambiente-Jaguariuna - SP - Brazil;

Laboratorio de Residuos e Contaminantes-Embrapa Meio Ambiente-Jaguariuna - SP - Brazil;

Instituto de Quimica da Unicamp-Campinas-SP-Brazil;

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正文语种 eng
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关键词
ozonation; pesticide; advanced oxidation process; heterogeneous photocatalysis; degradation; glyphosate;

机译：臭氧化农药;先进的氧化工艺;非均相光催化降解;草甘膦;

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Studies on degradation of glyphosate by several oxidative chemical processes: Ozonation, photolysis and heterogeneous photocatalysis

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