摘要
High Cr(VI) concentration is a potential serious risk to environment and ecologic system.Thus,it is essential to effectively monitor Cr contamination in water systems and scientifically evaluate its evolution trend.A new method of in-situ tracer technique by Cr isotopic analysis for quantitatively estimating Cr-contamination and its regional evolution in natural waters as well as a case application are reported in this paper.Based on documented literatures,an experimental procedure for chemical separation and purification of Cr in water samples and its analytical method for Cr isotopic measurement by thermal ionization mass spectrometry(TIMS) are established.Eleven samples collected around a chemical factory in Hubei Province were analyzed by this technique.These samples showδ53Cr values ranging from-1.7‰to 7.3‰and an elevating trend with an increasing in distance from the sampling site to pollution source.A functional correlation following Rayleigh fractionation law was established between sample'sδ53Cr value and its extent of Cr contamination.This study suggests that Cr isotopic analysis is an effective method to reveal the spatial distribution and its evolution trend of Cr contamination in the regional water system.It is thus helpful to assessing the self-purifying ability of local water system according to Cr isotopic fractionation.
High Cr （VI） concentration is a potential serious risk to environment and ecologic system. Thus, it is essential to effectively monitor Cr contamination in water systems and scientifically evaluate its evolution trend. A new method of in-situ tracer tech- nique by Cr isotopic analysis for quantitatively estimating Cr-contamination and its regional evolution in natural waters as well as a case application are reported in this paper. Based on documented literatures, an experimental procedure for chemical separation and purification of Cr in water samples and its analytical method for Cr isotopic measurement by thermal ionization mass spectrometry （TIMS） are established. Eleven samples collected around a chemical factory in Hubei Province were analyzed by this technique. These samples show 853Cr values ranging from -1.7‰ to 7.3‰ and an elevating trend with an increasing in distance from the sampling site to pollution source. A functional correlation following Rayleigh fractionation law was established between sample＇s 853Cr value and its extent of Cr contamination. This study suggests that Cr isotopic analysis is an effective method to reveal the spatial distribution and its evolution trend of Cr contamination in the regional water system. It is thus helpful to assessing the self-purifying ability of local water system according to Cr isotopic fractionation.
作者
GAO YongJuan 1,2,3,MA Teng 4,5,LING WenLi 1,2,LIU CunFu 4,5 & LI Li 4,5 1Faculty of Earth Science,China University of Geosciences,Wuhan 430074,China
2State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China
3 Graduate School,China University of Geosciences,Wuhan 430074,China
4 Biogeological and Environmental Geology Laboratory of Ministry of Education(China University of Geosciences) ,Wuhan 430074,China
5 Sino-Hungary Joint Laboratory of Environmental Sciences and Health,China University of Geosciences,Wuhan 430074,China
基金
supported by the National Natural Science Foundation of China(Grant No. 40402021)
