Isotopic tracing for nitrate pollution process of water body in the lower reaches of Fenhe River
MENG Zhi-long1, YANG Yong-gang1, QIN Zuo-dong1, JIAO Wen-tao2
1. Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China;
2. Research center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
The objectives of this study were to reveal the sources of nitrate and the contribution of each source, based on isotopic tracing and IsoSource. The results showed that NO3--N is the main nitrogen species in the sudied area, which ranges in 4.21~16.29mg/L, the spatial distribution of nitrate pollution are different greatly, 77.8% of the samples have exceeded the drinking water standard of China. The NH4+-N ranges from 0.31~9.47mg/L. The NO2--N have been found in all surface water samples and the groundwater sample of Guozhuang, which indicates that the coal mining activity of Liyazhuang has already affect the water quality of groundwater. δ15N-NO3- ranges in +2.28‰~+13.88‰, δ18O-NO3- ranges in-0.28‰~+10.14‰, respectively. Nitrate is mainly produced by nitrification. Denitrification has been found in the river reaches of Guangshengshi, longzici and Miaoqian. Manure and sewage are the main sources of nitrate in the river reach of Linfen and Hejin, the contribution rate are 69% and 62%, respectively. Chemical fertilizer is the main sources of nitrate in the river reach of Xiangfen due to the agricultural activities, the contribution rate is 57%. Soil organic nitrogen is the main sources of nitrate in the groundwater, the contribution rate is 48%.
孟志龙, 杨永刚, 秦作栋, 焦文涛. 汾河下游流域水体硝酸盐污染过程同位素示踪[J]. 中国环境科学, 2017, 37(3): 1066-1072.
MENG Zhi-long, YANG Yong-gang, QIN Zuo-dong, JIAO Wen-tao. Isotopic tracing for nitrate pollution process of water body in the lower reaches of Fenhe River. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 1066-1072.
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