Silver nanoparticle-modified electrode for the determination of nitro compound-containing pesticides.
Anal Bioanal Chem
; 408(10): 2595-606, 2016 Apr.
Article
em En
| MEDLINE
| ID: mdl-26873207
ABSTRACT
This paper reports the electroanalytical determination of pendimethalin and ethyl parathion by square-wave adsorptive stripping voltammetry using a material comprised of chitosan-stabilized silver nanoparticles to modify a glassy carbon electrode. Under optimized experimental conditions, the peak current was found to vary linearly with the concentration of pendimethalin in the range of 70 to 2000 nmol L(-1) and with concentration of ethyl parathion in the range of 40 to 8000 nmol L(-1). Detection limits of 36 and 40 nmol L(-1) were obtained for pendimethalin and ethyl parathion, respectively. The silver - nanoparticle-modified electrode was successfully employed for the analysis of pesticides in tap and mineral water (pendimethalin) and in lettuce and honey (ethyl parathion) samples. Pendimethalin recovery was between 94 and 100 %, and ethyl parathion recovery was between 97 and 101 %, indicating no significant matrix interference effects on the analytical results. The accuracy of the electroanalytical methodology using the proposed modified electrode was also compared to that of the UV-vis spectrophotometric method.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Paration
/
Praguicidas
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Prata
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Eletrodos
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Nanopartículas Metálicas
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Compostos de Anilina
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Nitrogênio
Idioma:
En
Revista:
Anal Bioanal Chem
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Brasil