中国地质调查2025，Vol.12Issue(1)：98-108,11.DOI:10.19388/j.zgdzdc.2024.199
华南沿海地区地下水硝酸盐分布特征及来源识别
Distribution characteristics and source identification of nitrate in the underground water of coastal areas of South China:A case study of Zhuhai City
摘要
Abstract
Nitrate pollution could present in the underground water due to the human activities like agriculture,industry,residents and mariculture in coastal areas.In order to find out the distribution characteristics and sources of nitrate in the underground water of the coastal areas of South China,the authors in this paper took a typical coastal city-Zhuhai as an example.The mathematical statistics,ion ratio and principal component analy-sis were adopted to study the distribution characteristics of water chemical,nitrate,nitrite and ammonia nitrogen,and the sources of nitrate in the underground water.The results show that the underground water is mainly weak acid,and conductivity of deep confined underground water is obviously higher than that of shallow underground water.The chemical type of underground water is mainly Ca2+·Mg2+-HCO3 and Na+-Cl-·SO4-type.The dissolved inorganic nitrogen(DIN)of pore confined groundwater in loose rocks is mainly composed of NH4+,and the DIN of other types of underground water is mainly NO3.Nitrate and nitrite exceed the standard in sporadic water samples,and the concentration of nitrate is relatively high in the water samples of hilly areas and intermoun-tain valleys.The ammonia nitrogen of 18.01％underground water samples in loost rocks exceeds the standard,and the high concentration ammonia nitrogen water samples are mainly distributed in the coastal plain area.The chemical characteristics of underground water in the study area is mainly controlled by the weathering,evaporation and seawater mixing of silicate and sulfate minerals.Nitrate in the underground water is mainly from atmospheric precipitation and human activities.Nitrate in clastic pore fissure groundwater,granite metamorphic rook fissure groundwater and pore unconfined groundwater mainly comes from atmospheric precipitation,and agricultural activ-ities.Nitrate in pore confined groundwater in loose rocks and carbonate fissure karst water comes from domestic sewage and mariculture wastewater.This research results could provide scientific basis for the development,utili-zation and protection of the underground water in the coastal areas of South China.关键词
滨海地区/地下水/硝酸盐/水化学/成因Key words
coastal zone/underground water/nitrate/hydrochemistry/genesis分类
地质学引用本文复制引用
何军,黎义勇,吴盼,曾敏,陈晨,赵信文..华南沿海地区地下水硝酸盐分布特征及来源识别[J].中国地质调查,2025,12(1):98-108,11.基金项目
中国地质调查局"粤港澳大湾区资源环境承载能力监测评价(编号:DD20221729)"和珠海市财政项目"珠海市城市地质调查(含信息化)(编号:MZCD-2201-008)"联合资助. （编号:DD20221729）
