碳同位素和水化学在示踪贵阳地下水碳的生物地球化学循环及污染中的应用
Chemical and stable carbon isotopic compositions of the ground waters of Guiyang City,China:Implications for biogeochemical cycle of carbon and contamination
查看参考文献23篇
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文摘
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地下水污染影响碳的生物地球化学循环，碳的演化也能够反映地下水的污染状况。对贵阳城区地下水的水化学、溶解无机碳含量及其碳同位素进行了分析。研究结果表明，地下水化学以SO_4·HCO_3-Ca·Mg型和HCO_3-Ca· Mg型为主，化学组分分析结果表明，水化学特征主要受岩性控制。地下水中溶解无机碳表现形式主要为HCO_3~-，丰水期由于稀释作用其含量减少。而丰水期δ_(13)C_(DIC)较枯水期偏负，生物成因无机碳占比重大。结合碳同位素和NO_3~-等人为活动输入物质的负相关性尝试对城区地下水污染分区，结论为贵阳市区中部、东北部以及西郊农业区地下水受污染较为严重。 |
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其他语种文摘
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Variations in concentration and isotopic composition (δ~(13)Cmc) of dissolved inorganic carbon (DIC) reflect the contamination and biogeochemical cycle of the carbon in ground water. With a main purpose to understand the contamination and biogeochemical cycle of the DIC, a research on the geochemistry of the ground waters of Guiyang City is carried out. The results show that the ground waters are mainly characterized by SO4 o HC0_3-Ca o Mg and HC0_3-Ca· Mg chemical composition. The hydrochemical characteristics of these types of water are mainly controlled by lithology of the aquifers. The average concentrations of Ca~(2+) , Mg~(2+) , HCO_3~- and SO_4~(2-) in the high-flow season are lower than those in the low-flow season, which shows a dilution process during the wet season by the mixing of infiltrated meteoric water of low solute content with the aquifer ground water. HCO3 is the dominant species of the DIC in the ground waters, and has lower concentrations and more negative values of δ~(13)CDIC in high-flow season than low-flow season. This indicates that more DIC has biogeochemical origin in the high-flow season than the low-flow season, and that biological activities are the predominant control on shifts of stable carbon isotope values. The δ~(13)Cmc compositions of the ground waters vary in accordance with change in concentration of human activity-induced species, this indicates that the anthropogenic input into the ground water systems may have an influence on the aquatic ecosystem of the ground water system. In according with spatial distributions of δ~(13)CDIC and the chemistry of the ground waters, it can be concluded that there is a significant amount of contaminants from human activities put especially into the groundwater in center, northeast and western suburb of Guiyang city. |
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来源
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地球化学
,2004,33(2):165-170 【核心库】
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关键词
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碳同位素
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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中国科学院知识创新工程重要方向项目
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国家自然科学基金
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文献收藏号
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CSCD:1635263
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