长江科学院院报 ›› 2017, Vol. 34 ›› Issue (4): 15-19.DOI: 10.11988/ckyyb.20160120

• 水资源与环境 • 上一篇    下一篇

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

王锦国,李 群,王碧莹,章 颖   

  1. 河海大学 地球科学与工程学院,南京 211000
  • 收稿日期:2016-02-17 出版日期:2017-04-01 发布日期:2017-04-10
  • 作者简介:王锦国(1974-),男,山西阳泉人,教授,博士,主要从事水文地质研究,(电话)025-83787140(电子信箱)wang_jinguo@hhu.edu.cn。
  • 基金资助:
    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)

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

WANG Jin-guo, LI Qun, WANG Bi-ying, ZHANG Ying   

  1. School of Earth Science and Engineering, Hohai University, Nanjing 211000, China
  • Received:2016-02-17 Online:2017-04-01 Published:2017-04-10

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(NH4+)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NH4+,其次为NO3-。通过对δ15N-NH4+同位素分析可知,地下水中约27.3%的NH4+来源于化肥,约72.7%NH4+来自于动物粪便、生活污水等高δ15N值的污染源;对δ15N-NO3-同位素分析可知,地下水中约有15.2%的NO3-来源于化肥和土壤有机氮,63.6%的NO3-来源于动物粪便和污水;约21.2%的地下水样本中δ15N-NO3-值超出了污染源的同位素值,可能产生了反硝化作用。

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

Abstract: 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 δ15N-NH4+ showed that 27.3% of NH4+ in the groundwater was from chemical fertilizer and the rest was from the sources with high δ15N, such as animal manure and domestic sewage, etc. On the other hand, isotopic analysis of δ15N-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 about 21.2% of samples were with higher isotope values than the pollution source, reflecting the denitrification in shallow groundwater at the study area.

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