中国岩溶2013，Vol.32Issue(1)：57-63,7.
基于15N同位素技术的岩溶地下河硝酸盐污染变化特征研究——以重庆青木关地下河为例
Variation features of nitrate pollution in karst underground river based on 15 N isotope techniques:A case study in the Qingmuguan underground river, Chongqing
摘要
Abstract
Groundwater in the Qingmuguan underground river is monitored with hydrochcmistry and 15N isotope techniques to investigate temporal and spatial variations of nitrate-nitrogen and its possible sources from May, 2010 to October, 2010. The results show that nitrate concentrations are 5. 077 mg/L at the Dingjia-longdong outlet and 0. 812 mg/L at the Tianchi inlet of the underground river. Nitrate concentrations of the groundwater are low at the Tianchi inlet, and the change range of the δ15 N concentration is low, from -7. 0475‰ to +7. 059 ‰, which proves that the Tianchi inlet only polluted by nitrogen slightly and the outside influence to groundwater also slight, and the sewage and fcce.s are not the major source of δ15N in this point. The concentration of δ15N at the Dingjialongdong outlet ranges, overall high and changes much more extensively, from -21. 453 ‰, to +37. 825 ‰. That proves the Dingjialongdong is affected more strongly by direct emission of feces from the pig farm and precipitation.关键词
地下河/15N同位素/硝态氮/变化特征Key words
underground river/ 15N isotope/ nitrate nitrogen/ change characteristics分类
资源环境引用本文复制引用
王开然,贾亚男,胡大超..基于15N同位素技术的岩溶地下河硝酸盐污染变化特征研究——以重庆青木关地下河为例[J].中国岩溶,2013,32(1):57-63,7.基金项目
国家自然科学基金项目(41101036、41102161) （41101036、41102161）
