【摘 要】
：
Methylated mercury compounds(MeHg)are ubiquitous neurotoxins that exist in natural waters typically at ultra-trace level(<1.0 ng L-1).In contrast to traditional methods,the relatively newly developed
【机 构】
：
the state key laboratory of environmental geochemistry,Institute of Geochemistry,Guiyang,China
【出 处】
：
The 17th International Conference on Heavy Metals in the Env
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Methylated mercury compounds(MeHg)are ubiquitous neurotoxins that exist in natural waters typically at ultra-trace level(<1.0 ng L-1).In contrast to traditional methods,the relatively newly developed diffusive gradients in the thin-films(DGT)technique have been demonstrated capable of in situ measuring trace metals in aqueous matrices.The DGT technique employs a membrane,a diffusive gel and a binding gel.For Hg determination,however,prevalently used polyacrylamide diffusive gel has proven unsuitable,due to the affinity of mercuric compounds to the polymers amine groups.By implementing an agarose-based diffusive gel,we aimed in this study to optimize the DGT method for measuring MeHg concentration in natural waters.The experimental work included: 1)performance test of agarose-based gels of various preparation formulae; 2)determination of the MeHg diffusivity in various gel formula matrices; 3)assessment of the adsorption rate for MeHg in-between polyacrylamide and agarose gels; 4)measurement of the DGT uptake and elution efficiencies for MeHg.The results are in support of that such modified DGT device can be used for biogeochemical exploration of MeHg in aqueous systems.The developed method will be applied in paddy ecosystem to investigate the transportation pathways of MeHg between paddy pore water and rice plants.
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