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Selective solid-phase extraction of trace mercury(II) using a silica gel modified with diethylenetriamine and thiourea

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Abstract

We describe a solid phase extractor for selective separation and preconcentration of Hg(II) ion. It was prepared by immobilizing the adduct of diethylenetriamine and thiourea on silica gel. The effects of solution acidity, preconcentration time, sample flow rate and volume were optimized. The results show that Hg(II) can be selectively extracted from acidic solutions and in presence of common other metal ions. The adsorbent is stable, can be reused more than 10 times, and the maximum adsorption capacity is 23 mg g−1. Hg(II) was quantified by inductively coupled plasma optical emission spectrometry. The method has a detection limit of 23 ng L−1, and the relative standard deviation is <2 %. The procedure was validated by analyzing two standard materials (river sediment and hair powder), and was successfully applied to the preconcentration of Hg(II) in real samples.

A solid phase extractor was firstly prepared by immobilizing DETA-TU (equimolar adduct of diethylenetriamine and thiourea) on the silica gel, which was applied to selectively separate/preconcentrate trace Hg(II) from real samples

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Authors and Affiliations

  1. Department of Chemistry, Lanzhou University, Lanzhou, 730000, People’s Republic of China

    Yin Jiang, Qun He, Zheng Hu & Xijun Chang

  2. Department of Chemistry, Nankai University, Tianjin, 300071, People’s Republic of China

    Huatang Zhang

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  1. Yin Jiang
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  3. Qun He
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  4. Zheng Hu
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  5. Xijun Chang
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Correspondence to Xijun Chang.

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Jiang, Y., Zhang, H., He, Q. et al. Selective solid-phase extraction of trace mercury(II) using a silica gel modified with diethylenetriamine and thiourea. Microchim Acta 178, 421–428 (2012). https://doi.org/10.1007/s00604-012-0858-6

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  • DOI: https://doi.org/10.1007/s00604-012-0858-6

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