Characteristics of Stable Mercury Isotopic Compositions in the Food Web of the Caohai Lake

被引：0
|
作者：
Xu Y.-Y. [1 ]
He T.-R. [1 ]
机构：
[1] Key Laboratory of Karst Environment and Geohazard Prevention, Guizhou University, Guiyang
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 01期
关键词：
Caohai Lake; Food web; Mass-dependent fractionation; Mass-independent fractionation; Mercury isotope;
D O I：
10.13227/j.hjkx.201804143
中图分类号：
学科分类号：
摘要：
Caohai Plateau Wetland is a National Nature Reserve. The characteristics of stable mercury isotopic compositions in the food web were studied by comprehensively analyzing the concentrations of Hg species (MeHg, THg), δ 13 C, and δ 15 N, and the isotopic compositions of Hg in different aquatic organisms. The main results are as follows: all samples of the food web show mass-dependent fractionation (MDF) and mass-independent fractionation (MIF) and a negative δ 202 Hg(-0.93‰±1.32‰, n=14)and positive Δ 199 Hg(0.79‰±0.76‰, n=14). The δ 199 Hg values are significantly positively correlated with δ 15 N (r=0.65, P<0.05) and the δ 202 Hg values also exhibit a positive correlation with δ 15 N, except for Myriophyllum spicatum(δ 15 N=-1.88‰), indicating that the bioaccumulation of mercury leads to an enrichment with heavier isotopes. The Δ 199 Hg values increase with δ 15 N(r=0.67, P<0.05). Nevertheless, the Δ 199 Hg values correlate with %MeHg (r=0.58, P<0.05), indicating that the increase of the MIF level in the samples with the food web might be related to%MeHg. © 2019, Science Press. All right reserved.
引用
收藏
页码：461 / 469
页数：8
相关论文
共 40 条
  • [1] Selin N.E., Global biogeochemical cycling of mercury: a review, Annual Review of Environment and Resources, 34, pp. 43-63, (2010)
  • [2] Lindqvist O., Johansson K., Bringmark L., Et al., Mercury in the Swedish environment-recent research on causes, consequences and corrective methods, Water, Air, and Soil Pollution, 55, 1-2, pp. 1-261, (1991)
  • [3] Lauretta D.S., Klaue B., Blum J.D., Et al., Mercury abundances and isotopic compositions in the Murchison (CM) and Allende (CV) carbonaceous chondrites, Geochimica et Cosmochimica Acta, 65, 16, pp. 2807-2818, (2001)
  • [4] Feng X.B., Yin R.S., Yu B., Et al., Mercury isotope variations in surface soils in different contaminated areas in Guizhou Province, China, Chinese Science Bulletin, 58, 2, pp. 249-255, (2013)
  • [5] Sherman L.S., Blum J.D., Keeler G.J., Et al., Investigation of local mercury deposition from a coal-fired power plant using mercury isotopes, Environmental Science & Technology, 46, 1, pp. 382-390, (2012)
  • [6] Zhang J.L., Wu H., Yu L.F., Et al., Structure feature of typical Karst forest plant community in Caohai wetland watershed of Guizhou Province, Journal of Southern Agriculture, 44, 3, pp. 471-477, (2013)
  • [7] Yan H.Y., Feng X.B., Li Z.G., Et al., A methodological development in measuring total mercury in fish using semi-closed digestion and CVAFS, Earth and Environment, 33, 1, pp. 89-92, (2005)
  • [8] Qiu G.L., Feng X.B., Liang L., Et al., Determination of methylmercury in moss by ethylation-gas chromatography-cold vapor atomic fluorescence spectrometry with solvent extraction, Journal of Instrumental Analysis, 24, 1, pp. 29-32, (2005)
  • [9] Yan H.Y., Feng X.B., Liang L., Et al., Determination of methyl mercury in fish using GC-CVAFS, Journal of Instrumental Analysis, 24, 6, pp. 78-80, (2005)
  • [10] Yin R.S., Feng X.B., Foucher D., Et al., High precision determination of mercury isotope ratios using online mercury vapor generation system coupled with multicollector Inductively coupled plasma-mass spectrometer, Chinese Journal of Analytical Chemistry, 38, 7, pp. 929-934, (2010)
1234