Resumo

ZAREI, Ali Reza; GHOLAMIAN, Forouzan  e  CHALAVI, Soheila. Micelle-mediated extraction and cloud point pre-concentration for the spectrophotometric determination of phenol in water samples. S.Afr.j.chem. (Online) [online]. 2011, vol.64, pp.158-162. ISSN 1996-840X.

In this paper, a cloud point extraction method for the determination of trace amounts of phenol by spectrophotometry is described. The method is based on the colour reaction of phenol with diazotized p-nitroanilinean alkaline media and the cloud point extraction of azo dye product using of nonionic surfactant Triton X-114. The effects of reaction and extraction parameters were studied and optimum parameters were established. The calibration graph was linear in the range of 2.0-400 ng mL^-1 of phenol. Detection limit based on three times the standard deviation of the blank (3S_b) was 1.0 ng mL^-1 and the relative standard deviation (RSD) for 50 ng mL^-1 of phenol was 1.73 % (n = 10). The proposed method was applied for the determination of phenolin water samples.

Palavras-chave : Pre-concentration; cloud point extraction; phenol; spectrophotometry; water samples.

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