Analytical method of Cr stable isotope and its application to water pollution survey
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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 show δ 53Cr 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 δ 53Cr 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.
KeywordsCr contamination Cr isotope analytical protocol case application pollution assessment
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- 1.Zhao W Y, Zheng Y L, Guan L Z. A mechanism study on the Cr-waste pollution of groundwater and vegetables (in Chinese). Environ Prote Sci, 1994, 20: 15–19Google Scholar
- 2.Qin J M, Pei J G, Guo H X. Secondary Cr-pollution by powdery coal ash: a case study of Cr6+ contamination in groundwater surrounding an ash-hill of power station (in Chinese). Carsol Sin, 2001, 20: 189–195Google Scholar
- 3.Wu S H, Zhou D P, Lu W G, et al. A study on remediation of hexavalent chromium-contaminated soil by sulphate-reducing bacteria (in Chinese). J Agro-Environment Sci, 2007, 26: 467–471Google Scholar
- 5.Liu X L, Hu H K, Liu X Q, et al. A case study in Huangshi on soil reduction capacity to Cr(VI) in eluviated solutions from Cr slag (in Chinese). J Huangshi Polytechnic College, 2000, 16: 9–12Google Scholar
- 6.Chang W Y, Chen X D, Fen X B, et al. Contaminated natures of soil and groundwater within terrains of Cr-bearing waste piels and a primary experimental study on biological detoxication by aboriginal microbe (in Chinese). Environ Protec Sci, 2002, 28: 31–33Google Scholar
- 7.Meng F S, Wang Y Y. An experiment study on PRB remediation of Cr-polluted groundwater (in Chinese). Groundwater, 2007, 29: 96–99Google Scholar
- 8.Gao Y J. Analytical method of Cr stable isotope and its application in water pollution survey (in Chinese). Master Dissertation. Wuhan: China University of Geosciences, 2007Google Scholar
- 10.Ellis A S. Selenium and chromium stable isotopes and the fate of redox-active contaminants in the environment. Doctoral Dissertation. Illinois: University of Illinois at Urbana-Champain, 2003, 33–42Google Scholar
- 14.Lugmair G W, Shukolyukov A. 53Mn-53Cr isotope systematics of the HED parent body. In: Lunar Planet. Science XXVIII. Houston: The Lunar and Planetary Institute, 1997. 851–852Google Scholar
- 19.Daniel J B. Chromium isotope fractionation during oxidation of Cr (III) by manganese oxides. In: Goldschmidt Conference. Moscow. Pittsburgh: University of Pittsburgh, 2005. A212Google Scholar