| 河北平原地下水硫酸盐34S和18O同位素演化特征 |
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| 引用本文：李小倩,周爱国,刘存富,蔡鹤生,武金博,甘义群,周建伟,余婷婷.2008.河北平原地下水硫酸盐34S和18O同位素演化特征[J].地球学报,29(6):745-751. |
| DOI：10.3975/cagsb.2008.06.14 |
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| 基金项目:国家自然科学基金“硫酸盐中17O和18O同时测试技术及其应用”和“微量水17O和18O同时测试新技术及其在水循环研究中的应用”项目(编号:40572140,40602030) |
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| 中文摘要:地下水中硫酸盐的34Ss和18O在探寻地下水的水质演化规律、赋存环境特征方面具有重要的研究意义,笔者选取保定-河间-沧州-黄骅剖面采集深层地下水水样,分析测试了其主要阴阳离子含量、δ18O、δD、14C及δ34Sso42-和δ18Oso42-各项指标,在此基础上首次探讨了河北平原地下水中硫酸盐的硫、氧同位素分布特征与演化机理.研究发现研究区地下水硫酸盐的δ34Sso42-值沿地下水流向增大,δ18Oso42-值则在一个较小的范围内波动,最终接近一个常数值,二者间呈现较好的负相关关系;δ34Sso42-值随地下水14C年龄的增加而增加,δ34Sso42-则随地下水14C年龄的增加而趋于稳定;34Sso42-值与r(so42-)/r(C1-)的值呈负相关关系,δ18Oso42-值与r(SO42-)/r(C1-)的值则呈正相关关系.在研究区地下水中硫酸盐的34S和18O同位素的分布演变特征主要由SO42-和水之间的同位素交换反应、微生物硫酸盐的还原作用、硫化氢的再氧化作用所影响,其中微生物硫酸盐的还原作用的结果使地下水中的硫酸盐富集34S,SO42-和水之间的同位素交换反应是影响地下水的δ18Oso42-值的主导因素,使地下水的δ18Oso42-取决于地下水的氧同位素组成. |
| 中文关键词:硫酸盐 34S 18O 地下水 河北平原 |
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| 34S and 18O Isotopic Evolution of Residual Sulfate in Groundwater of the Hebei Plain |
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| Abstract:Sulfur and oxygen isotopic compositions play a significant role in studying groundwater quality evolution and its environment characteristics.A section along Baoding-Hejian-Cangzhou-Huangye was selected to collect deep groundwater samples,and the samples were then analyzed for such items as main ions,δ18O,δD,14CO,δ34Ssulfate-residual and δ18Osulfate-residual.On this basis,this paper has discussed the distribution characteristics of 34S and 18O residual sulfate in deep groundwater and their potential evolution mechanism in Quaternary sediments of the Hebei Plain.It is pointed out that δ34Ssulfate-residual values rise in the groundwater flow direction and δ18Osulfate-residual values vary in a narrow range and finally tend to attain a constant value, that the two kinds of values show an obvious negative correlation, that δ34Ssulfate-residual values increase together with the older 14C age of groundwater and δ18Osulfate-residual values tend to attain a constant value with the increasing 14C age of groundwater, and that δ34Ssulfate-residual values have also a negative correlation with r(SO42-)/r(Cl-)mole ratios of groundwater while a positive correlation exists between δ18Osulfate-residual values and SO42-/Cl- mole ratios of groundwater. The fractors controlling 34S and 18O evolution of sulfate residuals in groundwater might be the isotope exchange reaction betwen SO42- and groundwater, the sulfate reduced by bacteria and the re-oxidation of H2S. The sulfate residuals in groundwater are likely to be rich in 34S as the sulfate is reduced by bacteria. The oxygen isotope exchange reaction between SO42- and groundwater is the controlling factor of δ18Osulfate-residual values, which cuases the dependency of δ18Osulfate-residual values on oxygen isotopic composition of groundwater. |
| keywords:sulfate 34S 18O groundwater Hebei plain |
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