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Determination of mercury in aquatic systems by DGT device using thiol-modified carbon nanoparticles suspension as the liquid binding phase

Abstract

A diffusive gradients in thin-films technique (DGT) device using thiol-modified carbon nanoparticles (SH-CNPs) suspension as the liquid binding phase and cellulose acetate membrane as the diffusive layer was evaluated for determination of Hg2+ in waters. Laboratory DGT validation experiments gave linear mass uptake over time (R2 ≥ 0.99) for Hg2+ in different concentration solutions. The effect of pH, ionic strength and potential interfering ions on Hg2+ binding with DGT devices were investigated. The results showed that, the gathering amount of SH-CNPs-DGT for Hg2+ reached to the maximum when the pH of solution was close to neutral, the ionic strength of solution and the co-existing potential interfering ions such as Cd2+, Cr3+, Cu2+ and Pb2+ had no significant effect on the gathering of SH-CNPs-DGT for Hg2+. Finally, validation of the SH-CNPs-DGT devices was undertaken for Hg2+ in spiked local water systems (DongPu Reservoir and Nanfei River). For in situ measurements in Nanfei River water, the average labile Hg concentrations were (0.091±0.009), (0.053±0.003), (0.071±0.006) μg L-1 during the three, six and seven days, respectively, which were lower than the value of direct measurement concentration of the Nanfei River water samples by ICP-MS, for the DGT only measures ionic mercury and labile mercury species but the direct measurement measures total mercury including inert organic species and large colloids.

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Publication details

The article was received on 06 Jun 2017, accepted on 05 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ02007D
Citation: New J. Chem., 2017, Accepted Manuscript
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    Determination of mercury in aquatic systems by DGT device using thiol-modified carbon nanoparticles suspension as the liquid binding phase

    W. Tianxing, G. Wang, Y. Zhang, M. Kong and H. Zhao, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02007D

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