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Development of a new diffusive gradients in thin films (DGT) method for the simultaneous measurement of CH3Hg+ and Hg2+.

Abstract

Abstract: In this study, a Tulsion® CH-95 binding gel-based diffusive gradients in thin films (TCH DGT) method, was developed for the simultaneous measurement of CH3Hg+ and Hg2+. The binding kinetics of CH3Hg+ and Hg2+ in a mixed solution indicated rapid uptake to the TCH gel. The Hg2+ exhibited slower absorption rates compared to the CH3Hg+, which did not affect DGT uptake overall. Stable elution efficiencies were obtained for CH3Hg+ and Hg2+ using a mild reagent containing 0.1 M HCL and 2% thiourea. Diffusion coefficients of CH3Hg+ and Hg2+ in agarose gel were calculated on the basis of time-series deployment method and were 9.94 (×10-6 cm2·s-1, 25) and 7.65 (×10-6 cm2·s-1, 25), respectively. DGT uptakes were independent of pH for CH3Hg+ (pH 4.10-8.10) and Hg2+ (pH 4.10-10.03), with no effect of ionic strengths between 0.1-1000 mM NaCl. The capacity of TCH DGT for CH3Hg+ and Hg2+ according to linear and theoretical responses were calculated to be 33.97 μg·cm-2 and 30.34 μg·cm-2, respectively. The performance of this technique was further tested in sediments. Two distinct peaks of CH3Hg+ and Hg2+ appeared at the similar sediment depths, reflecting that the localized remobilization of CH3Hg+ and Hg2+ may occur through similar mechanisms. It confirms that the TCH DGT is a useful in-situ monitoring tool.

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Publication details

The article was received on 16 Jan 2018, accepted on 29 Mar 2018 and first published on 02 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ00211H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Development of a new diffusive gradients in thin films (DGT) method for the simultaneous measurement of CH3Hg+ and Hg2+.

    M. Ren, Y. Wang, S. Ding, L. Yang, Q. Sun and L. Zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00211H

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