A cloud point extraction for spectrophotometric determination of ultra- trace antimony without chelating agent in environmental and biological samples
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- Samadi-Maybodi, A. & Rezaei, V. Microchim Acta (2012) 178: 399. doi:10.1007/s00604-012-0852-z
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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.