Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling. Meng, M.; Sun, R., y.; Liu, H., w.; Yu, B.; Yin, Y., g.; Hu, L., g.; Chen, J., b.; Shi, J., b.; and Jiang, G., b. Journal of Hazardous Materials, 2020.
abstract   bibtex   
Mercury (Hg) speciation and isotopic compositions in a large-scale food web and seawater from Chinese Bohai Sea were analyzed to investigate methylmercury (MeHg) sources and Hg cycling. The biota showed ∼5‰ variation in mass dependent fractionation (MDF, −4.57 to 0.53‰ in δ202Hg) and mostly positive odd-isotope mass independent fractionation (odd-MIF, −0.01 to 1.21‰ in Δ199Hg). Both MDF and odd-MIF in coastal biota showed significant correlations with their trophic levels and MeHg fractions, likely reflecting a preferential trophic transfer of MeHg with higher δ202Hg and Δ199Hg than inorganic Hg. The MDF and odd-MIF of biota were largely affected by their feeding habits and living territories, and MeHg in pelagic food web was more photodegraded than in coastal food web (21–31% vs. 9–11%). From the Hg isotope signatures of pelagic biota and extrapolated coastal MeHg, we suggest that MeHg in the food webs was likely derived from sediments. Interestingly, we observed complementary even-MIF (mainly negative Δ200Hg of −0.36 to 0.08‰ and positive Δ204Hg of −0.05 to 0.82‰) in the biota and a significant linear slope of −0.5 for Δ200Hg/Δ204Hg. This leads us to speculate that atmospheric Hg0 is an important source to bioaccumulated MeHg, although the exact source-receptor relationships need further investigation.
@article{
 title = {Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling},
 type = {article},
 year = {2020},
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 keywords = {E0658,GBMS},
 volume = {384},
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 abstract = {Mercury (Hg) speciation and isotopic compositions in a large-scale food web and seawater from Chinese Bohai Sea were analyzed to investigate methylmercury (MeHg) sources and Hg cycling. The biota showed ∼5‰ variation in mass dependent fractionation (MDF, −4.57 to 0.53‰ in δ202Hg) and mostly positive odd-isotope mass independent fractionation (odd-MIF, −0.01 to 1.21‰ in Δ199Hg). Both MDF and odd-MIF in coastal biota showed significant correlations with their trophic levels and MeHg fractions, likely reflecting a preferential trophic transfer of MeHg with higher δ202Hg and Δ199Hg than inorganic Hg. The MDF and odd-MIF of biota were largely affected by their feeding habits and living territories, and MeHg in pelagic food web was more photodegraded than in coastal food web (21–31% vs. 9–11%). From the Hg isotope signatures of pelagic biota and extrapolated coastal MeHg, we suggest that MeHg in the food webs was likely derived from sediments. Interestingly, we observed complementary even-MIF (mainly negative Δ200Hg of −0.36 to 0.08‰ and positive Δ204Hg of −0.05 to 0.82‰) in the biota and a significant linear slope of −0.5 for Δ200Hg/Δ204Hg. This leads us to speculate that atmospheric Hg0 is an important source to bioaccumulated MeHg, although the exact source-receptor relationships need further investigation.},
 bibtype = {article},
 author = {Meng, Mei and Sun, Ruo yu and Liu, Hong wei and Yu, Ben and Yin, Yong guang and Hu, Li gang and Chen, Jiu bin and Shi, Jian bo and Jiang, Gui bin},
 journal = {Journal of Hazardous Materials},
 number = {November}
}
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