RESEARCH ARTICLE

 

Micelle-mediated extraction and cloud point pre-concentration for the spectrophotometric determination of phenol in water samples

 

 

Ali Reza Zarei^*; Forouzan Gholamian; Soheila Chalavi

Department of Chemistry, Faculty of Materials, Malek Ashtar University of Technology, Tehran, Iran

 

 

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ABSTRACT

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.

Keywords: Pre-concentration, cloud point extraction, phenol, spectrophotometry, water samples

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Received 6 September 2011
Revised 15 October 2011
Accepted 23 October 2011

 

 

* To whom correspondence should be addressed. E-mail: zarei1349@gmail.com