奎河两岸污灌区浅层地下水氮污染特征及同位素示踪分析  

Characteristics of Nitrogen Pollution and Isotopic Tracer Analysis of Shallow Groundwater in the Sewage Irrigation Area of Kuihe River

作　　者：王锦国[1] 李群[1] 王碧莹[1] 章颖[1] 

机构地区：[1]河海大学地球科学与工程学院,南京211000

出　　处：《长江科学院院报》2017年第4期15-19,32,共6页Journal of Changjiang River Scientific Research Institute

基　　金：水利部公益性行业科研专项经费项目(200901064);江苏省"六大人才高峰"高层次人才项目(2014-JY-001)

摘　　要：地下水中氮污染主要包括铵态氮和硝态氮,特别是当铵(NH_4^+)作为地下水的主要污染物时,由于其在含水层中迁移规律复杂,且难以去除,成为研究该问题的难点。在奎河徐州段两岸通过钻孔对浅层地下水进行取样测试分析,研究区浅层地下水中氮的存在形式主要为NH_4^+,其次为NO_3^-。通过对δ^(15)N-NH_4^+同位素分析可知,地下水中约27.3%的NH_4^+来源于化肥,约72.7%NH_4^+来自于动物粪便、生活污水等高δ^(15)N值的污染源;对δ^(15)N-NO_3^-同位素分析可知,地下水中约有15.2%的NO_3^-来源于化肥和土壤有机氮,63.6%的NO_3^-来源于动物粪便和污水;约21.2%的地下水样本中δ^(15)N-NO_3^-值超出了污染源的同位素值,可能产生了反硝化作用。Nitrogen pollution in groundwater is mainly caused by the intrusion of ammonium nitrogen and nitrate nitrogen. Especially when ammonium（ NH4^＋） is the major pollutant in groundwater,studying its distribution characteristics will be difficult as its migration law in aquifers is complicated and the pollutant is hard to be removed.Through boring holes at both banks of Kuihe River in Xuzhou city,we collected water samples to analyze nitrogen pollution. Test results showed that the main existence form of nitrogen in the study area was NH4^＋,followed by NO3^-. Isotopic analysis of δ^15N-NH4^＋showed that 27.3% of NH4^＋in the groundwater was from chemical fertilizer and the rest was from the sources with high δ^15N,such as animal manure and domestic sewage,etc. On the other hand,isotopic analysis of δ^15N-NO3^-showed that 15.2% of NO3^-was from chemical fertilizer and soil organic nitrogen and 63.6% of that was from animal manure and sewage. Test and analysis of groundwater also showed that about21.2% of samples were with higher isotope values than the pollution source,reflecting the denitrification in shallow groundwater at the study area.

关 键 词：奎河两岸污灌区 地下水 硝态氮 铵态氮 同位素 反硝化 

分 类 号：X523[环境科学与工程—环境工程]