北京城市地表河流硝酸盐氮来源的氮氧同位素示踪研究  

Application of nitrogen and oxygen isotopes in study of nitrate sources in Beijing urban rivers

作　　者：任玉芬[1] 张心昱[2] 王效科[1] 贺成武[1,3] 侯培强[1] 徐志伟[2] 欧阳志云[1] 

机构地区：[1]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [2]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京100101 [3]河南理工大学资源环境学院,焦作454003

出　　处：《环境工程学报》2013年第5期1636-1640,共5页Chinese Journal of Environmental Engineering

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-EW-310);国家自然科学基金面上项目(41030744和40901265)

摘　　要：为了有效防治城市地表河流硝酸盐氮的污染并进行针对性水体治理,利用δ15N和δ18O双同位素示踪技术,对北京城区地表河流硝酸盐污染进行了溯源。选取北京9条河流的10个监测点,分析了硝酸盐氮污染的浓度分布特征,并运用MAT253氮氧双同位素技术解析了硝酸盐的各种来源。研究结果表明,北京城区地表河流硝酸盐氮污染自上游至下游逐渐加重,上游8个监测点的硝酸盐氮平均浓度在0.7～3.4 mg/L之间,下游东护城河和通惠河2处硝酸盐氮的浓度均值分别达7.6 mg/L和7.0 mg/L。利用同位素质谱MAT253分析,得知北京城区地表河流δ15N值总体分布范围为-1.2‰～+28.88‰,δ18O值分布范围为+0.09‰～+6.62‰,依据δ15N和δ18O的特征范围,得出北京城区地表河流硝酸盐来源主要是粪肥和污水。In order to protect urban surface water quality and provide proper solutions to reduce nitrate pol-lution, nitrogen and oxygen isotopes δ（ ^15 N and ^180） were used to trace sources of nitrate in urban rivers. 10 sampling sites on 9 rivers in Beijing were selected to analyze the spatial pattern of nitrate pollution. Results showed that the rivers were seriously polluted by nitrate, especially in the downstream. Mean nitrate concentra-tion was between 0.7 mg/L and 3.4 mg/L for the 8 sites in the upstream, and 7. 6 mg/L and 7.0 mg/L respec-tively for Donghucheng River and Tonghui River in the downstream. Using isotope mass spectrometer MAT253, the nitrogen and oxygen isotope values were measured. The values of δ^15N and δ^180, which explained different sources of nitrate of urban rivers in different river segments, ranged from - 1.2‰ to ＋ 28.88‰ and from ＋ 0.09‰ to ＋ 6.62‰, respectively. The results of δ^15 N and and δ^18O indicate that manure and sewage are the two main sources of nitrate in Beijing urban surface waters.

关 键 词：城市地表河流 硝酸盐污染 氮氧同位素 来源示踪 

分 类 号：X522[环境科学与工程—环境工程]