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Determination of arsenic species in rice samples using CPE and ETAAS.
Costa, Bruno Elias Dos Santos; Coelho, Nívia Maria Melo; Coelho, Luciana Melo.
Afiliação
  • Costa BE; Departamento de Química, Universidade Federal de Goiás, Campus Catalão, Av. Doutor Lamartine Pinto de Avelar, 1120 Setor Universitário, CEP 75704-020 Catalão, GO, Brazil.
  • Coelho NM; Instituto de Química, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, CEP 38400-902 Uberlândia, MG, Brazil.
  • Coelho LM; Departamento de Química, Universidade Federal de Goiás, Campus Catalão, Av. Doutor Lamartine Pinto de Avelar, 1120 Setor Universitário, CEP 75704-020 Catalão, GO, Brazil. Electronic address: lucianacatalao@hotmail.com.
Food Chem ; 178: 89-95, 2015 Jul 01.
Article em En | MEDLINE | ID: mdl-25704688
A highly sensitive and selective procedure for the determination of arsenate and total arsenic in food by electrothermal atomic absorption spectrometry after cloud point extraction (ETAAS/CPE) was developed. The procedure is based on the formation of a complex of As(V) ions with molybdate in the presence of 50.0 mmol L(-1) sulfuric acid. The complex was extracted into the surfactant-rich phase of 0.06% (w/v) Triton X-114. The variables affecting the complex formation, extraction and phase separation were optimized using factorial designs. Under the optimal conditions, the calibration graph was linear in the range of 0.05-10.0 µg L(-1). The detection and quantification limits were 10 and 33 ng L(-1), respectively and the corresponding value for the relative standard deviation for 10 replicates was below 5%. Recovery values of between 90.8% and 113.1% were obtained for spiked samples. The accuracy of the method was evaluated by comparison with the results obtained for the analysis of a rice flour sample (certified material IRMM-804) and no significant difference at the 95% confidence level was observed. The method was successfully applied to the determination of As(V) and total arsenic in rice samples.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio / Oryza / Espectrofotometria Atômica / Contaminação de Alimentos Idioma: En Revista: Food Chem Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio / Oryza / Espectrofotometria Atômica / Contaminação de Alimentos Idioma: En Revista: Food Chem Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido