南极土壤样品中汞同位素分布特征研究
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- 英文论文题名：Mercury stable isotope compositions in soils from the Antarctica
- 论文作者：刘洪伟 ; 刘成斌 ; 史建波 ; 江桂斌
- 英文论文作者：Hongwei Liu ; Chengbin Liu ; Jianbo Shi ; Guibin Jiang ; State Key Laboratory of Environmental Chemistry and Ecotoxicology ; Research Center for Eco-Environmental Sciences ; Chinese Academy of Sciences
- 年：2016
- 作者机构：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;
- 论文关键词：汞稳定同位素 ; 质量分馏 ; 非质量分馏
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X53
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：208k
- 原文格式：D
- 会议级别：全国
摘要
汞同位素分馏效应可以用来追溯污染源、生物地球化学反应及其过程[1]。多接收器电感耦合等离子体质谱仪(MC-ICP/MS)可以实现汞同位素比值的高精度测量。本研究对南极地区4个采样点土壤样品中汞的含量及同位素组成进行了分析。结果表明,南极地区土壤中总汞浓度范围为11.2~21.9ng/g,平均浓度为18.2±4.3 ng/g。δ202Hg范围为-1.3~-0.69‰,平均值为-0.96±0.22‰。Δ199Hg范围为-0.02~-0.12‰,平均值为-0.06±0.05‰。本研究采集的所有土壤样品中δxxxHg值均为负值,说明南极地区土壤样品中发生了轻同位素的富集。可以发生汞同位素非质量分馏的因素主要有无机汞的光化学还原与甲基汞的光致降解过程,研究表明两个过程样品中Δ199Hg/Δ201Hg的比值不同,无机汞的光化学还原过程约为1:1而甲基汞的光致降解过程约为1.36:1[2]。样品中Δ199Hg/Δ201Hg的比值为0.93,说明导致土壤中汞同位素非质量分馏的因素主要是无机汞的光化学还原过程。
Mercury stable isotope fractionation could trace the pollution sources,biogeochemical reaction and processes.Multicollector inductively coupled plasma mass spectrometry(MC-ICP/MS) has become the most precise tool for detecting the composition of mercury isotope ratios.In this study,soil samples were collected from four sites in the Antarctica.The isotope compositions of mercury were determined with CVG coupled with MC-ICP/MS.The concentrations of THg in soil samples ranged from 11.2 ng/g to 21.9 ng/g with the average of 18.2±4.3 ng/g.The δ202Hg was in the range-1.3‰ to-0.69‰ and the average was-0.96±0.22‰.All the δxxxHg values of the soils were negative,suggesting the enrichment of light isotopes.The ratios of Δ199Hg/Δ201Hg indicate that the photoreduction of inorganic mercury was probably the main process which caused the mercury stable isotope fractionation in soils.
Mercury stable isotope fractionation could trace the pollution sources,biogeochemical reaction and processes.Multicollector inductively coupled plasma mass spectrometry(MC-ICP/MS) has become the most precise tool for detecting the composition of mercury isotope ratios.In this study,soil samples were collected from four sites in the Antarctica.The isotope compositions of mercury were determined with CVG coupled with MC-ICP/MS.The concentrations of THg in soil samples ranged from 11.2 ng/g to 21.9 ng/g with the average of 18.2±4.3 ng/g.The δ202Hg was in the range-1.3‰ to-0.69‰ and the average was-0.96±0.22‰.All the δxxxHg values of the soils were negative,suggesting the enrichment of light isotopes.The ratios of Δ199Hg/Δ201Hg indicate that the photoreduction of inorganic mercury was probably the main process which caused the mercury stable isotope fractionation in soils.
引文
[1]Run-Sheng Y I N,Xin-Bin F,Foucher D,et al.Chinese Journal of Analytical Chemistry,2010,38(7):929-934.
[2]Bergquist B A,Blum J D.Elements,2009,5(6):353-357.
[2]Bergquist B A,Blum J D.Elements,2009,5(6):353-357.