Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling
	Meng, Mei; Sun, Ruo-yu; Liu, Hong-wei; Yu, Ben; Yin, Yong-guang; Hu, Li -gang; Chen, Jiu-bin; Shi, Jian-bo; Jiang, Gui-bin
刊名	JOURNAL OF HAZARDOUS MATERIALS
	2020-02-15
卷号	384 页码:1-7
关键词	Mercury isotope fractionation Trophic transfer Methylmercury source Photo-demethylation Atmospheric Hg-0
ISSN号	0304-3894
英文摘要	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 similar to 5 parts per thousand variation in mass dependent fractionation (MDF, -4.57 to 0.53 parts per thousand in delta Hg-202) and mostly positive odd-isotope mass independent fractionation (odd-MIF, -0.01 to 1.21 parts per thousand in Delta Hg-199). 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 delta Hg-202 and Delta Hg-199 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 Delta Hg-200 of -0.36 to 0.08 parts per thousand and positive Delta Hg-204 of -0.05 to 0.82 parts per thousand) in the biota and a significant linear slope of -0.5 for Delta Hg-200/Delta Hg-204. This leads us to speculate that atmospheric Hg-0 is an important source to bioaccumulated MeHg, although the exact source-receptor relationships need further investigation.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44731]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Meng, Mei,Sun, Ruo-yu,Liu, Hong-wei,et al. Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling[J]. JOURNAL OF HAZARDOUS MATERIALS,2020,384:1-7.
APA	Meng, Mei.,Sun, Ruo-yu.,Liu, Hong-wei.,Yu, Ben.,Yin, Yong-guang.,...&Jiang, Gui-bin.(2020).Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling.JOURNAL OF HAZARDOUS MATERIALS,384,1-7.
MLA	Meng, Mei,et al."Mercury isotope variations within the marine food web of Chinese Bohai Sea: Implications for mercury sources and biogeochemical cycling".JOURNAL OF HAZARDOUS MATERIALS 384(2020):1-7.