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Voltammetric determination of dialifos in soils with a mercury film ultramicroelectrode
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Orientador(es)
Resumo(s)
An extraction-adsorptive stripping voltammetric procedure for the determination
of the pesticide dialifos in soil samples using microwave-assisted solvent extraction
and a mercury film ultramicroelectrode was developed. The method is based on
the use of hexane-acetone solvent (1:1, v/v) and on controlled adsorptive accumulation
of the insecticide at the potential of -0.10V (versus Ag/AgCl) in the presence of
Britton-Robinson buffer (pH 2.0). Soil sample extracts were analyzed directly after
drying and redissolution with the supporting electrolyte, but without other pretreatment.
The limit of detection obtained for a 10sec collection time was
2.0x10-8 mol L-1. Recovery experiments for the global procedure, at the
0.100µgg-1 level, gave satisfactory average and standard deviation results for the
two different soils tested.
Descrição
Palavras-chave
Dialifos Mercury film ultramicroelectrode Microwave-assisted solvent extraction Soils
Contexto Educativo
Citação
Editora
Taylor & Francis