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Solid phase extraction of gold(III) on silica gel modified with benzoylthiourea prior to its determination by flame atomic absorption spectrometry

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Abstract

A new method has been developed for the determination of gold based on separation and preconcentration using silica gel modified with benzoylthiourea. The optimum experimental parameters for preconcentration of gold, such as acid concentration, sample flow rate, eluent and matrix ions, have been investigated. Gold could be quantitatively retained in the 0.25–2.0 mol L − 1 HCl and HNO3 concentrations, and then eluted completely with 0.5 mol L − 1 thiourea in 1.0 mol L − 1 HCl. The sorption capacity of gold(III) is 0.92 ± 0.04 mmol g − 1 with a high enrichment factor of 267. The relative standard deviation of the method, RSD%, was found as 1.2% for 0.1 μg mL − 1. The detection limit for gold was 1.4 μg L − 1. The validation of the proposed method was checked by the analysis of certified reference soil materials. The presented procedure was applied to the determination of gold in some environmental samples.

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  1. Faculty of Science and Arts, Chemistry Department, Dokuz Eylul University, Kaynaklar Campus, 35160, Izmir, Turkey

    Serap Seyhan Bozkurt & Melek Merdivan

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  1. Serap Seyhan Bozkurt
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  2. Melek Merdivan
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Correspondence to Melek Merdivan.

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Bozkurt, S.S., Merdivan, M. Solid phase extraction of gold(III) on silica gel modified with benzoylthiourea prior to its determination by flame atomic absorption spectrometry. Environ Monit Assess 158, 15–21 (2009). https://doi.org/10.1007/s10661-008-0561-6

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  • DOI: https://doi.org/10.1007/s10661-008-0561-6

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