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Mercury species have aroused wide concern in the past several decades due to their high toxicity. However, it is still difficult to detect ultra-trace mercury species due to their biochemical transformation in complex samples. To establish a simpler and more sensitive method for pre-concentration and determination of trace mercury species, molybdenum disulfide (MoS 2 ) nanosheets with sulfur-rich characteristics and enlarged interlayer spacing were prepared by a hydrothermal method coupled with a sonication-assisted liquid exfoliation method and acted as solid-phase extraction adsorbent. The nano-MoS 2 had high adsorption capacity, fast adsorption rate and excellent selectivity towards mercury ions (Hg 2+ ), methyl mercury (MeHg + ) and ethyl mercury (EtHg + ) in a wide pH range and complex matrices. And it could be easily regenerated by 4 mol L -1 HCl and reused several times. After optimizing HPLC-UV-HG-AFS conditions, a great linearity (1.0-10.0 μg L -1 , R  2 = 0.999 for Hg 2+ , MeHg + and EtHg + ), lower detection limits (0.017, 0.037 and 0.021 ng mL -1 for Hg 2+ , MeHg + and EtHg + , respectively), relative standard deviations (&lt;5%) and addition recoveries of the samples within 82.75-113.38% were observed. In summary, trace inorganic and organic mercury species in environmental and biological samples could be selectively enriched by the prepared nano-MoS 2 and efficiently seperated and detected by HPLC-UV-HG-AFS. The present study will help provide a better strategy for environmental monitoring and health assessment of mercury pollutants.

Synthesis of MoS2 nanosheets for mercury speciation analysis by HPLC-UV-HG-AFS

Synthesis of MoS₂ nanosheets for mercury speciation analysis by HPLC-UV-HG-AFS