A simple and efficient approach for preconcentration of some heavy metals incosmetic products before their determinations by ame atomic absorptionspectrometry

In the current study, a simple and efficient analytical method for preconcentration and determination ofCd(II), Pb(II), and Sn(II) in some cosmetic samples, using ultrasonic assisted-cloud point extraction and ame atomicabsorption spectrometry, was developed. The method is based on the ternary complex formations of Sn(II), Pb(II), andCd(II), which are available in the form of neutral and/or anionic hydroxo complexes (Sn(OH)3, Pb(OH)3, Cd(OH)2,and/or Cd(OH)3), with Victoria Pure Blue BO (VPB+) in the presence of cetylpyridinium chloride at pH 8.5, and thenextraction of the formed ternary complexes into the micellar phase of polyoxyethylene sorbitan monostearate (Tween60). Using the optimized conditions, a linear relationship was observed in the ranges of 12{330 g L1for Cd(II), 4{200 g L1for Pb(II), and 1{275 g L1for Sn(II). The detection limits for Cd(II), Pb(II), and Sn(II), respectively, were3.70, 1.35, and 0.45 g L1, with a preconcentration factor of 50, and the precision as relative standard deviations waslower than 4.2% for each analyte. The validity was veri ed by analysis of two certi ed reference materials. Finally, themethod was successfully applied to the determination of these metals in various cosmetic samples.

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