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• ALqadami, AA.
• Abdalla, MAbulhassan
• ALOthman, ZA.
• Omer, K
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• Abdalla, MAbulhassan
• ALOthman, ZA.
• Omer, K
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• Abdalla, MAbulhassan
• ALOthman, ZA.
• Omer, K

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Int. J. Environ. Res. Public Health 2013, 10(1), 361-374; doi:10.3390/ijerph10010361

Article

Application of Solid Phase Extraction on Multiwalled Carbon Nanotubes of Some Heavy Metal Ions to Analysis of Skin Whitening Cosmetics Using ICP-AES

Ayoub A. ALqadami, Mohammad Abulhassan Abdalla * , Zeid A. ALOthman and Kamal Omer

Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia

* Author to whom correspondence should be addressed.

Received: 13 August 2012; in revised form: 19 December 2012 / Accepted: 20 December 2012 / Published: 14 January 2013

Download PDF Full-Text [230 KB, Updated Version, uploaded 15 January 2013 15:59 CET]

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Abstract: A novel and highly sensitive method for the determination of some heavy metals in skin whitening cosmetics creams using multiwalled carbon nanotubes MWCNTs as solid phase extraction sorbent for the preconcentration of these heavy metals prior to their determination by inductively coupled plasma atomic emission spectrometry is described. Different practical parameters have been thoroughly investigated and the optimum experimental conditions were employed. The developed method was then applied for the determination of arsenic, bismuth, cadmium, mercury, lead and titanium in samples of skin whitening cosmetics. The detection limits under these conditions for As, Bi, Cd, Pb, Hg and Ti were 2.4, 4.08, 0.3, 2.1, 1.8, and 1.8 ng·mL⁻¹, respectively. The relative standard deviations (RSDs) were found to be less than 2.0%. For validation, a certified reference material of NIST SRM 1570a spinach leaves was analyzed and the determined values were in good agreement with the certified values. The recoveries for spiked samples were found to be in the range of 89.6–104.4%.

Keywords: cosmetics; heavy metals; ICP-AES; preconcentration; solid phase extraction; MWCNT

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