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Determination of ametryn in soils via microwave-assisted solvent extraction coupled to anodic stripping voltammetry with a gold ultramicroelectrode
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Orientador(es)
Resumo(s)
An extraction-anodic adsorptive stripping voltammetric
procedure using microwave-assisted solvent
extraction and a gold ultramicroelectrode was developed
for determining the pesticide ametryn in soil samples. The
method is based on the use of acetonitrile as extraction
solvent and on controlled adsorptive accumulation of the
herbicide at the potential of 0.50 V (vs. Ag/AgCl) in the
presence of Britton-Robinson buffer (pH 3.3). Soil sample
extracts were analysed directly after drying and redissolution
with the supporting electrolyte but without
other pre-treatment. The limit of detection obtained for a
10 s collection time was 0.021 µg g-1. Recovery experiments
for the global procedure, at the 0.500 µg g-1 level,
gave satisfactory mean and standard deviation results
which were comparable to those obtained by HPLC with
UV detection.
Descrição
Palavras-chave
Ametryn Gold ultramicroelectrode Stripping voltammetry Spiked soil samples Microwave-assisted solvent extraction
Contexto Educativo
Citação
Editora
Springer-Verlag