Simultaneous Determination of Mercury(Ⅱ) and Silver(Ⅰ) Ions in Water by Near-Infrared Spectroscopy with Preconcentration by Thiol-functionalized Polysilsesquioxane Microspheres

doi:10.3969/j.issn.0251-0790.2012.04.006

Abstract

Abstract: A method for simultaneous determination of metal ions in water samples was developed using adsorption preconcentration and near-infrared diffuse reflectance spectroscopy(NIRDRS). A high capacity adsorbent of thiol-functionalized polysilsesquioxane microspheres(PMPSQ) was prepared for preconcentration of Hg²⁺ and Ag⁺ in aqueous solutions. After adsorbing the analytes onto the adsorbent, NIRDRS was measured and partial least squares(PLS) models were established for fast and simultaneous quantitative prediction. Because the interaction of the ions with the functional groups of the adsorbent can be revealed from the spectra, the models built with the water samples were proven efficient enough to predict Hg²⁺ and Ag⁺ in a range of 0.16—1.80 mg/L and that of 0.15—1.70 mg/L respectively. The wavenumber changes of C—H group are thought to be the quantitative basis.

Key words: Near-infrared spectroscopy, Heavy metal ion, Enrichment, Adsorbent, Mechanism

CLC Number:

O655

TrendMD:

NING Yu, CAI Wen-Sheng, SHAO Xue-Guang. Simultaneous Determination of Mercury(Ⅱ) and Silver(Ⅰ) Ions in Water by Near-Infrared Spectroscopy with Preconcentration by Thiol-functionalized Polysilsesquioxane Microspheres[J]. Chem. J. Chinese Universities, 2012, 33(04): 673.

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