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Sorption of trace metals on human hair and application for cadmium and lead pre-concentration with flame atomic absorption determination

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Abstract

Human hair shavings were characterized as a sorbent for trace metals. At pH 7.0 metal sorption follows the order Pb(II)>Cd(II)>Cr(VI)>Fe(III)>Cu(II)>Ni(II)>Mn(VI). Metal recovery is quantitative for Pb and Cd after 30 min of equilibration. Recovery of other metals is less quantitative and varies with pH. For example, while Cu is best recovered at pH 5, Ni and Mn are sorbed optimally in the basic pH region. Sorbed metals can be washed off the sorbent with 0.5 mol L–1 strong mineral acids or more completely with 0.1 mol L–1 ethylenediaminetetraacetic acid (EDTA). Typical sorption isotherms were obtained for Cd and Pb with sorption capacities of 39 and 26 μmol g–1, respectively.

Hair sorbent was used for 40-fold pre-concentration of Cd and Pb from treated wastewater samples followed by flame atomic absorption spectroscopic (FAAS) determination. Comparison of the data obtained for lead and cadmium by the proposed pre-concentration method with that by graphite furnace atomic absorption spectroscopy (GFAAS) showed 79 to 86% recovery and comparable analytical precision. Common cations and anions at the levels normally present in natural water do not interfere in the proposed pre-concentration-FAAS method.

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Acknowledgements

This work was conducted in part in Al-Albayt University laboratories. The technical help of Muhannad Musaad is highly appreciated. Mr Adel Mostafa did the graphite furnace atomic absorption analyses.

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Correspondence to Jamal A. Sweileh.

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Sweileh, J.A. Sorption of trace metals on human hair and application for cadmium and lead pre-concentration with flame atomic absorption determination. Anal Bioanal Chem 375, 450–455 (2003). https://doi.org/10.1007/s00216-002-1686-z

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  • DOI: https://doi.org/10.1007/s00216-002-1686-z

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