| 稳定同位素53Cr在地下水污染研究中的应用 |
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| 引用本文：高永娟,马腾,刘存富,蔡鹤生.2005.稳定同位素53Cr在地下水污染研究中的应用[J].地球学报,26(z1):296-298. |
| DOI：10.3975/cagsb.2005.s1.96 |
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| 中文摘要:铬是地表水和地下水中的常见污染物，它被广泛应用于电镀、制革和防腐。在氧化条件下，Cr以Cr(Ⅵ)的阴离子铬酸盐（CrO2-4）和重铬酸盐（HCrO-4）形式存在，有很高的溶解性和流动性。Cr(Ⅵ)是一种可疑的致癌物。在还原条件下，Cr的分馏。所有地下水Cr(Ⅲ),它不溶解，并且强烈地吸附在固体表面上，而且毒性很小。Cr(Ⅵ)的还原作用可导致Cr稳定同位素轻同位素。因此，稳定铬同位素比值可以用作地下水中Cr(Ⅵ)还原程度的指示剂。笔者使用方程（1）确定了两个地下水样（MW-6和MW-12）的还原程度，它们分别为31%和68%。 |
| 中文关键词:铬53Cr/52Cr 地下水污染 |
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| The Application of Stable Chromium Isotope 53Cr to the Study of Groundwater Pollution |
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| Abstract:Chromium, a common pollutant in surface water and groundwater, is widely used in electroplating, leather tanning, and corrosion protection.Under the oxidizing condition, Cr is highly soluble and mobile in the forms of chromater (CrO2-4)and bichro-mate (HCrO2-4)of Cr(Ⅵ)anions.Cr(Ⅵ)is a suspicious carcinogen. Under the reduction condition, Cr(Ⅵ)may convert to Cr(Ⅲ), which is insoluble, strongly adsorbed on the solid surface, and lexx toxic. Thereduction of Cr(Ⅵ)results in Cr stable-isotope fractionation. The analyses of Cr(Ⅵ) in the roundwater show enrichment of the heavy isotopes relative to plating baths.Cr(Ⅵ) redution has preferentially removed lighter isotopes from the groundwater. Stable Cr isotope ratios can thus serve as indicatios of the extent of Cr(Ⅵ)reduction in groundwater. Eq.1 was used to determine the reduction extents of two groundwater samples MV-9 and. MV, which tumed out to be 12.31% and 68%, respectively. |
| keywords:chromium 53Cr/52Cr groundwater pollution |
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