Source of nitrate in groundwater based on hydrochemical and dual stable isotopes
FU Xue-mei1,2, SUN Yuan-yuan1, SU Jing1, ZHENG Ming-xia1, XI Bei-dou1, QIAN Guang-ren2
1. Chinese Research Academy of Environmental Science, State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012, China;
2. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
The groundwater samples of the north bank of Yanghe, Xuanhua District, Zhangjiakou City, Hebei Province were selected, to identify the pollution source, ratio, migration and transformation characteristics of nitrogen in groundwater by qualitative and quantitative methods. Land type analysis, hydrogeochemistry analysis, and isotope tracer technique of δ15N-NO3- and δ18O-NO3- were used in the study. The results showed that the main contaminant of nitrogen pollution was NO3- in the study area, and 77% samples during four sampling sessions at 12 sampling points exceeded World Health Organization standard value 10mg/L. The serious pollution period was in August 2018. According to spatial concentration interpolation results, the lower nitrate concentration was along the river and the offshore area, and the higher was in the middle area. Different land use type had different concentration, dry land had highest and urban system had higher concentration. The results of stable isotope model (SIAR) showed that the proportion of groundwater nitrate pollution sources were 45.37%, 41.39%, and 13.24% for manure and domestic sewage, soil nitrogen, and NH4+ in rainfall and fertilizers. The result was consistent with the land use types. Besides, nitrification was dominated migration and transformation process of nitrogen. The study can provide more accurate and comprehensive analysis method for groundwater nitrogen pollution sources analysis, and recommendation for groundwater pollution control.
傅雪梅, 孙源媛, 苏婧, 郑明霞, 席北斗, 钱光人. 基于水化学和氮氧双同位素的地下水硝酸盐源解析[J]. 中国环境科学, 2019, 39(9): 3951-3958.
FU Xue-mei, SUN Yuan-yuan, SU Jing, ZHENG Ming-xia, XI Bei-dou, QIAN Guang-ren. Source of nitrate in groundwater based on hydrochemical and dual stable isotopes. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3951-3958.
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