| 硫酸对乌江中上游段岩溶水化学及δ13 CDIC的影响 |
| 摘要点击 2323 全文点击 1136 投稿时间：2015-03-31 修订日期：2015-04-25 |
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| 中文关键词 岩溶地下水 地表水 H2SO4 δ13 CDIC 乌江中上游 |
| 英文关键词 Karst groundwater surface water H2SO4 δ13 CDIC Upper and Middle Reaches of Wujiang River |
| 作者 | 单位 | E-mail | | 黄奇波 | 中国地质大学环境学院, 武汉 430074
中国地质科学院岩溶地质研究所, 桂林 541004
国土资源部/广西岩溶动力学重点实验室, 桂林 541004 | qbohuang0108@163.com | | 覃小群 | 中国地质科学院岩溶地质研究所, 桂林 541004
国土资源部/广西岩溶动力学重点实验室, 桂林 541004 | | | 刘朋雨 | 中国地质科学院岩溶地质研究所, 桂林 541004
国土资源部/广西岩溶动力学重点实验室, 桂林 541004 | | | 张连凯 | 中国地质科学院岩溶地质研究所, 桂林 541004
国土资源部/广西岩溶动力学重点实验室, 桂林 541004 | | | 苏春田 | 中国地质大学环境学院, 武汉 430074
中国地质科学院岩溶地质研究所, 桂林 541004
国土资源部/广西岩溶动力学重点实验室, 桂林 541004 | |
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| 中文摘要 |
| 对乌江中上游段地表和地下水水化学、溶解无机碳 (DIC)同位素组成 (δ13 CDIC) 进行了测试,探讨流域水化学特征及主要影响因素,利用化学计量法对硫酸溶蚀碳酸盐岩的比例及对HCO3-离子的贡献比例进行了计算. 结果表明:1乌江上游段地表和地下水优势阳离子均为Ca2+,分别占全部阳离子的50%以上,阴离子以HCO3-、SO42-为主,两者占总阴离子的85%以上,水化学类型主要为HCO3-Ca,部分为HCO3 ·SO4-Ca型,反映出部分地下水和地表水可能受到人类源的SO42-影响; 2地下水和地表水的δ13 CDIC值介于-12.98‰~-6.36‰,且[Ca2++Mg2+]/[HCO3-]当量比值介于1.11~1.90,H2SO4对流域水化学和δ13 CDIC具有重要影响; 3硫酸溶解碳酸盐岩对地下水(Ca2++Mg2+)和HCO3-的贡献变化分别介于20.59%~92.87%(平均贡献率为51.50%)和11.47%~86.69%(平均贡献率为36.90%); 对地表水(Ca2++Mg2+)和HCO3-的贡献变化分别介于56.14%~94.55%(平均贡献率为76.89%)和39.02%~89.66%(平均贡献率为64.24%),显示硫酸显著地影响到流域碳酸盐岩的风化过程. 研究结果对乌江流域水资源的保护和开发利用及岩溶碳循环研究意义重大. |
| 英文摘要 |
| Groundwater and surface water from the Upper and Middle Reaches of the Wujiang River were sampled and analyzed for the hydrochemistry and Carbon isotope in DIC. Then hydrochemical characteristics and the main influencing factors were investigated, and the contributions of carbonate dissolution by sulphuric acid to total(Ca2++Mg2+) and HCO3- were calculated using the stoichiometry method. The results showed that the advantage cations of groundwater and surface water is Ca2+, which accounted for more than 50%, and the advantage anions is HCO3- and SO42-, which accounted for more than 85%. The hydrochemical characteristics of most samples were of Ca-HCO3 type, and a small part of HCO3 ·SO4-Ca, reflecting a few samples affected by SO42- from human source. The δ13 CDICof groundwater and surface water, varying from -12.98‰ to -6.36‰ with a changeable molar ratio between (Ca2++Mg2+) and HCO3- of 1.11 to 1.90, indicated that sulfuric acid has an important influence on hydrochemistry and δ13 CDIC. The contributions of carbonate dissolution by sulphuric acid to total (Ca2++Mg2+) and HCO3- in groundwater ranged from 20.59% to 92.87% (average 51.50%), and from 11.47% to 86.69% (average 36.90%). While the contributions of carbonate dissolution by sulphuric acid to total (Ca2++Mg2+) and HCO3- in surface water ranged from 56.14% to 94.55% (with an average of 76.89%), and 39.02% to 89.66% (with an average of 64.24%), respectively, demonstrated that sulphuric acid is an important agent of carbon rock weathering. The results of this study have a great significance for the protection and development and utilization of water resources in the Wujiang River basin and for karst carbon cycle research. |
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