Produção Nacional
Revisado por pares
Determination of disulfoton in surface water samples by cloud-point extraction and gas chromatography
2007; Taylor & Francis; Volume: 87; Issue: 4 Linguagem: Inglês
10.1080/03067310601068841
ISSN1029-0397
AutoresAnízio M. Faria, Raquel Pellanda Dardengo, Cláudio F. Lima, Antônio Augusto Neves, Maria Eliana Lopes Ribeiro de Queiroz,
Tópico(s)Pharmaceutical and Antibiotic Environmental Impacts
ResumoThis article proposes an alternative method, using cloud-point extraction and gas chromatography, for extraction and determination of disulfoton in water samples. For cloud-point extraction, the nonionic surfactant Triton X-114 was used. Before gas chromatography, a cleanup stage for surfactant removal from the extracts was optimized. Cleanup used two columns, in series, containing silica gel and Florisil, with methanol:hexane (1 : 1) as eluent, resulting in the removal of more than 95% of the Triton X-114. Factors such as ionic strength (>0.5 mol L−1) and surfactant concentration (1.0% w/v) increased the extraction efficiency of the cloud-point methodology, yielding disulfoton recoveries of almost 100%. Compared with liquid–liquid extraction, the cloud-point methodology was more efficient, with a better detectability, and resulted in a significant reduction in solvent volume.
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