内陆核电站拟选厂址附近浅层地下水水化学特征及同位素指示意义  

Hydrogeochemical Characteristics and Isotopic Indication of Shallow Groundwater in the Vicinity of a Proposed Inland Nuclear Power Plant

作　　者：董一慧 邸齐梦 刘显辉 刘春篁 李佳乐 高柏[1,2] 陈功新[1,2] 孙占学[1,2] DONG Yihui;DI Qimeng;LIU Xianhui;LIU Chunhuang;LI Jiale;GAO Bai;CHEN Gongxin;SUN Zhanxue(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学水资源与环境工程学院,南昌330013 [2]东华理工大学核资源与环境国家重点实验室,南昌330013

出　　处：《有色金属工程》2023年第7期158-168,共11页Nonferrous Metals Engineering

基　　金：国家自然科学基金国际(地区)合作研究项目(51861145308);国际原子能机构协调研究项目(F33024、F33026)。

摘　　要：以江西何魁核电站拟选厂址附近为研究区,采集地表水样品5个和浅层地下水(泉水和井水)样品37个,进行水化学及同位素分析。结果表明:拟选址周边地表水为淡水,呈弱碱性,主要阴、阳离子为HCO_(3)^(-)和Ca^(2+);泉水为弱酸性,主要阴、阳离子为HCO_(3)^(-)和Na^(+);井水呈弱碱性,主要阴、阳离子为HCO_(3)^(-)、Cl^(-)、SO_(4)^(2-)和Ca^(2+)、Na^(+)。水-岩相互作用和大气降水是影响该区浅层地下水化学特征的主要因素,Na^(+)和K^(+)来源于盐岩和硅酸岩溶解,Ca^(2+)来源于碳酸岩和石膏溶解,HCO_(3)^(-)、Cl^(-)和SO_(4)^(2-)分别来源于碳酸岩、盐岩和石膏溶解。饱和指数分析与离子比值结果共同显示,浅层地下水的主要组分来源于硅酸岩和碳酸岩风化溶解。氢氧稳定同位素组成显示,研究区井水主要受大气降水补给和混合作用影响,与碳氢化合物、硅酸岩矿物、CO_(2)及围岩、黏土发生交换,地表水受蒸发作用影响明显,泉水和井水受蒸发作用不明显。井水中氚浓度在2.1~3.6 TU,推测其年龄大于50 a。本研究为何魁内陆核电站拟选厂址提供天然环境背景值,为核电站附近地下水资源开发利用、环境保护和核电厂建设设计方案的优化提供理论依据,同时在突发事件中对水污染控制具有参考意义。The vicinity of the proposed site of Hekui NPP in Jiangxi Province was taken as the study area,and the shallow groundwater was chosen as the research object.Five surface water and thirty-seven shallow groundwater samples,including spring and well water,were collected for hydrochemical and isotopic analysis.The major results obtained from this study were as follows:the surface water in the study area was fresh water and weakly alkaline,and the major anions and cations were HCO_(3)^(-)and Ca^(2+);The spring water was weakly acidic,and the major anions and cations were HCO_(3)^(-)and Na^(+);The well water was weakly alkaline,and the major anions and cations were HCO_(3)^(-),Cl^(-),SO_(4)^(2-),and Ca^(2+)and Na^(+).Water-rock interaction and atmospheric precipitation were the dominant factors affecting the chemical characteristics of shallow groundwater in this area.Na^(+)and K^(+)came from halite and silicate dissolution.Ca^(2+)came from carbonate and gypsum dissolution.HCO_(3)^(-),Cl^(-),and SO_(4)^(2-)were from carbonate,halite,and gypsum dissolution,respectively.The saturation index results showed that major components of shallow groundwater were from the weathering and dissolution of silicate and carbonate.Stable hydrogen and oxygen isotope compositions showed that well water was mainly recharged by atmospheric precipitation and affected by mixing reactions.Groundwater exchanged with hydrocarbon and silicate minerals,CO_(2),wall rocks,and clay.Unlike spring water and well water,surface water was significantly affected by evaporation.Tritium concentration was between 2.1—3.6 TU,and it was speculated that the age of shallow groundwater was over 50 years.This study provides not only the natural environment background value for the proposed site of Hekui Inland NPP but also a theoretical basis for the development and utilization of groundwater resources,as well as environmental protection and the optimization of the design scheme for the construction of the NPP.Meanwhile,this study has reference significance for w

关 键 词：何魁核电站 浅层地下水 水化学特征 氢氧稳定同位素 氚同位素 

分 类 号：X75[环境科学与工程—环境工程]