, Volume 178, Issue 3-4, pp 399-404
Date: 26 Jun 2012

A cloud point extraction for spectrophotometric determination of ultra- trace antimony without chelating agent in environmental and biological samples

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Abstract

We report on a simple, sensitive and reliable method for the cloud point extraction of antimony (Sb) and its subsequent spectrophotometric detection. It is based on the color reaction of Sb (III) with iodide in acidic medium and subsequent micelle-mediated extraction of tetraiodoantimonate using a non-ionic surfactant in the absence of any chelating agent. The effects of reaction and extraction parameters were optimized. The calibration plot is linear in the range of 0.80–95 ng mL−1 of antimony in the sample solution, with a regression coefficient (r) of 0.9994 (for n = 9). The detection limit (at SNR = 3) is 0.23 ng mL−1, and the relative standard deviations at 10 and 70 ng mL−1 of antimony are 3.32 and 1.85 % (at n = 8), respectively. The method compared favorably to other methods and was applied to determine antimony in seawater, anti-leishmania drug (glucantime), and human serum.

Figure

This method is based on the extraction of yellow iodoantimonous acid (HSbI4) into surfactant-rich phase of Triton X-114 when trivalent antimony in sulfuric acid solution is treated with an excess of potassium iodide solution.