Synthesis of MoS 2 nanosheets for mercury speciation analysis by HPLC-UV-HG-AFS

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 an...

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Bibliographic Details
Published in:RSC advances 2018-05, Vol.8 (33), p.18364-18371
Main Authors: Gao, Xingsu, Dai, Jiayong, Zhao, Hongyan, Zhu, Jun, Luo, Lan, Zhang, Rui, Zhang, Zhan, Li, Lei
Format: Article
Language:English
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Summary: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 ) 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 had high adsorption capacity, fast adsorption rate and excellent selectivity towards mercury ions (Hg ), 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 HCl and reused several times. After optimizing HPLC-UV-HG-AFS conditions, a great linearity (1.0-10.0 μg L , = 0.999 for Hg , MeHg and EtHg ), lower detection limits (0.017, 0.037 and 0.021 ng mL for Hg , MeHg and EtHg , respectively), relative standard deviations (
ISSN:2046-2069
2046-2069
DOI:10.1039/c8ra01891j