Degradation of Herbicide Diuron in Water Employing the Fe/H2O2 System

نویسندگان

  • Liziara C. Cabrera
  • Sergiane S. Caldas
  • Sandra Rodrigues
  • Adalto Bianchini
  • Fábio A. Duarte
  • Ednei G. Primel
چکیده

O sistema de degradação utilizando ferro metálico e peróxido de hidrogênio (reação de Fenton) foi empregado para a degradação do herbicida diurom. Visando obter as melhores condições de degradação, foram otimizados parâmetros que influenciam no processo, como pH, concentração de peróxido de hidrogênio (H 2 O 2 ) e quantidade de ferro. A degradação do herbicida foi acompanhada por cromatografia líquida com detecção por arranjo de diodos (CLAE-DAD) e cromatografia líquida com detecção por espectrometria de massas sequencial (LC-ESI-MS/MS), além da determinação de carbono orgânico total (COT). Nas melhores condições de degradação, pH = 2,5; 2 g de ferro e 2 mmol L de H 2 O 2 , uma solução aquosa de diurom comercial (10 mg L), alcançou valores não detectáveis ao tempo de 10 min, para diurom e para o metabólito monitorado, 3,4-DCA. Ainda os valores de COT foram reduzidos, chegando a valores menores que 5 mg L, mostrando a eficiência e rapidez do sistema.

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تاریخ انتشار 2010