| 运用硫同位素、氮氧同位素示踪里湖地下河硫酸盐、硝酸盐来源 |
| 摘要点击 3309 全文点击 1507 投稿时间：2015-02-01 修订日期：2015-04-07 |
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| 中文关键词 岩溶地下河 水化学 硫同位素 氮氧同位素 示踪来源 |
| 英文关键词 karst underground water hydrochemistry sulfur isotope nitrate-oxygen isotope trace source |
| 作者 | 单位 | E-mail | | 李瑞 | 西南大学地理科学学院,重庆 400715
中国地质科学院岩溶地质研究所,联合国教科文组织国际岩溶研究中心,国土资源部/广西岩溶动力学重点实验室,桂林 541004 | 616569272@qq.com | | 肖琼 | 中国地质科学院岩溶地质研究所,联合国教科文组织国际岩溶研究中心,国土资源部/广西岩溶动力学重点实验室,桂林 541004 | xiaoqiong-8423@163.com | | 刘文 | 西南大学地理科学学院,重庆 400715
中国地质科学院岩溶地质研究所,联合国教科文组织国际岩溶研究中心,国土资源部/广西岩溶动力学重点实验室,桂林 541004
山东省地矿工程勘察院,济南 250014 | | | 郭芳 | 中国地质科学院岩溶地质研究所,联合国教科文组织国际岩溶研究中心,国土资源部/广西岩溶动力学重点实验室,桂林 541004 | | | 潘谋成 | 中国地质科学院岩溶地质研究所,联合国教科文组织国际岩溶研究中心,国土资源部/广西岩溶动力学重点实验室,桂林 541004 | | | 于奭 | 中国地质科学院岩溶地质研究所,联合国教科文组织国际岩溶研究中心,国土资源部/广西岩溶动力学重点实验室,桂林 541004
中国地质大学环境学院,武汉 430074 | |
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| 中文摘要 |
| 为揭示里湖地下水水质的时空变化规律,结合硫同位素及氮氧同位素分析水质变化原因,为开发和保护岩溶水资源提供科学依据. 于2010年1月至12月,2014年5月、10月对里湖地下河进行监测,分析其常规水化学组成及δ34S-SO42-、δ15N-NO3-、δ18O-NO3-特征. 结果表明:1地下河水化学类型为HCO3-Ca型,受到大气降水、人类活动等影响,各离子表现出明显的时空变化规律; 2自污水处理厂运营以来,地下河中硫酸盐浓度略有降低,但仍然偏高,与2010年相比,硝酸盐污染加剧. 受人类活动影响上游拉易洞、南丹河,中游凉风洞、甘田坝等地硫酸盐、硝酸盐浓度较高,下游小龙洞处浓度较低; 3地下河δ34S-SO42-值在-4.12‰~-0.93‰之间,通过与潜在硫源的δ34S比对,推断由工业和居民生活燃煤产生的大量硫氧化物引起雨水酸化,以酸雨的形式向当地地下水输入大量SO42-; 4δ15N-NO3-值在0.26‰~11.58‰之间,平均为7.61‰,δ18O-NO3-在-2.33‰~21.76‰之间,平均为9.38‰,结合硝酸盐氮氧同位素组成分析,认为土壤氮、人畜粪便和污水是研究区硝酸盐的主要贡献者,也是地下水中硝酸盐污染加剧的主要原因. |
| 英文摘要 |
| To reveal the temporal and spatial variation pattern of groundwater chemistry in Lihu Lake and explore the causes for the change of water quality through analysis of sulfur isotope and nitrogen-oxygen isotope, so as to provide scientific basis for reasonable exploitation and protection of karst water resources. Several groundwater samples, collected from January to December in 2010 and May, October in 2014 were monitored to analyze the chemical composition of conventional water and the characteristics of δ34S-SO42-,δ15N-NO3-, and δ18O-NO3-. The results showed that: 1 The hydrochemical type of the underground water was HCO3-Ca type and effected by the seasonal precipitation and human activity, the temporal and spatial variation of the main cations was obvious. 2 The sulfur concentration in the underground river was slightly decreased since the operation of the sewage plant, however, the sulfur concentration was still high. The nitrate pollution aggravated in the year 2014 compared to 2010. Impacted by human activity, the concentration of sulfur and nitrate was higher in the upstream Nandan river, Layi cave and the midstream Liangfeng cave, and Gantianba than in the downstream Xiaolong cave. 3 The δ34S-SO42- value ranged from -4.12 ‰ to-0.93 ‰. It was inferred that the emission of sulfur oxides through burning coal resulted in the rainwater acidification, which input a large amount of SO42- into the underground water in the form of acid rain. 4 The δ15N-NO3- value ranged from 0.26 ‰ to 11.58 ‰, with an average value of 7.61 ‰, the δ18O-NO3- value ranged from-2.33 ‰ to 21.76 ‰, with an average value of 9.38 ‰. In combination of the composition analysis of nitrogen-oxygen isotope of nitrate, it was believed that soil organic nitrogen, manure and sewage were the main sources of nitrate in the groundwater and the main causes for aggravation of nitrate pollution of the underground water. |
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