水资源与水工程学报2017，Vol.28Issue(6)：83-89,7.DOI:10.11705/j.issn.1672-643X.2017.06.15
滹沱河源头地下水硝酸盐污染的氮氧同位素示踪
Traceability of Nitrogen-Oxygen isotope on nitrate-contaminated groundwater of Hutuo River Source
摘要
Abstract
In order to determine the characteristics of nitrate pollution found in loose rock pore water in the source of the Hutuo River and its migration process, eight groundwater sampling points in Fanshi County were selected and analyzed,and the results are as follows:The content of constant element Ca2+in the groundwater is significantly larger than that of Na+, and there is a significant negative correlation between them. There is a significant positive correlation of the content between Na+ and Cl-. Along the groundwater flow, the HCO3-content, which is the main anion component, tends to decrease, but the rel-ative amplitude is small. The Cl-content increases with the increase of groundwater flow, and the relative variation is large. Basically, the dynamic of groundwater is mainly characterized by infiltration-runoff, with infiltration-runoff-evaporation as supplement, and the chemical reaction of groundwater is domi-nated by leaching and filtration mixed with concentration action. The nitrate - nitrogen pollution of groundwater in the source of Hutuo River is serious. The content of the NO3- from the sampling points is from 3 . 6 to 28 . 7 mg/L , with an average value of 14 . 3 mg/L and exceeding rate of 75％, and all the samples below Haojiawan exceeded the standard;With the increase of nitrate content,δ15 N shows no ob-vious decreasing trend , and the sampling of δ15 N/δ18O doesn' t form the proportional formula 2: 1. Com-bined with active alternation of surface water and groundwater environment, it can be inferred that there is basically no denitrification in the study area;Traceability analysis of δ15 N,δ18O shows that 12. 5％ of the samples are polluted by the domestic sewage and livestock excrement , 87 . 5％ of the samples are pollu-ted by soil, domestic sewage, livestock excrement , chemical fertilizer and rainfall, and the correspond-ing contribution rates are 62％, 22％, 16％ respectively. It also shows that the mineralization and nitrifi-cation of organic matter are taking place in this area.关键词
氮氧同位素/硝酸盐污染/迁移转化/松散岩类孔隙水/地下水/滹沱河源头Key words
Nitrogen-Oxygen isotope/nitrate pollution/migration and transformation/loose rock pore water/groundwater/Hutuo River Source分类
资源环境引用本文复制引用
赵鹏宇,翟召怀,步秀芹,刘晓东,王翠萍..滹沱河源头地下水硝酸盐污染的氮氧同位素示踪[J].水资源与水工程学报,2017,28(6):83-89,7.基金项目
2014年忻州师范学院专题研究项目(ZT201405) （ZT201405）
2015年忻州市科技发展计划项目(2015忻科发[9]号) （2015忻科发[9]号）
