title: Combination of diffusive gradient in a thin film probe and IC-ICP-MS for the simultaneous determination of CH3Hg+ and Hg2+ in oxic water.
abstract: A diffusive gradient in thin film technique (DGT) was combined with ion chromatography and inductively coupled plasma mass spectrometry (IC-ICP-MS) for the in situ simultaneous quantification of CH(3)Hg(+) and Hg(2+) in aquatic environments. After diffusing through an agarose diffusive layer, the Hg species accumulated in a thiol-functionalized resin layer and were extracted using acidic thiourea solution to form stable thiourea-Hg complexes that were separated and detected via ion chromatography and ICP-MS, respectively. The effective diffusion coefficients of CH(3)Hg(+) and Hg(2+) complexes in the agarose diffusion layer with chloride were 5.26 (±0.27) × 10(-6) and 4.02 (±0.10) × 10(-6) cm(2) s(-1), respectively. The effective diffusion coefficients of CH(3)Hg(+) and Hg(2+) complexes in the agarose diffusion layer with dissolved organic matter was 3.57 (±0.29) × 10(-6) and 2.16 (±0.19) × 10(-6) cm(2) s(-1), respectively. The practical method detection limits are 0.1 and 0.7 ng L(-1) for CH(3)Hg(+) and Hg(2+) respectively for three weeks deployment. Lower detection limits would be possible by employing a thinner agarose diffusive layer and/or by deploying the probes longer. The method can measure time averaged CH(3)Hg(+) and Hg(2+) concentrations simultaneously in oxic water, making it useful as an in situ monitoring tool.
authors.affiliation: Department of Geography and Environmental Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States.
authors.forename: Yong Seok
authors.initials: YS
authors.lastname: Hong
authors.forename: Erik
authors.initials: E
authors.lastname: Rifkin
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Bouwer
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004058:Diffusion; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis*; D010100:Oxygen / Q000737:chemistry*; D054712:Salinity; D013054:Spectrophotometry, Atomic; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D007477:Ions; D008767:Methylmercury Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D008628:Mercury; D010100:Oxygen