宿迁市地下水水化学特征及水质评价  

Hydro-chemical characteristics and water quality evaluation of groundwater in Suqian City

作　　者：冯丽敏 李文博[1] 李朗[1] 贺小桐 黄晓燕[1] FENG Li-min;LI Wen-bo;LI Lang;HE Xiao-tong;HUANG Xiao-yan(Geological Survey of Jiangsu Province,Nanjing 210018,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210018

出　　处：《地下水》2024年第4期39-43,154,共6页Ground water

基　　金：苏北黄泛区关键地段地质环境综合调查(宿迁城市地质调查)(苏财资环[2019]14号)。

摘　　要：为研究宿迁市地下水水化学特征及水质状况,以77组水样数据为基础,运用经典统计学、Piper三线图、相关性分析、Gibbs图、离子比值和氯碱指数等方法对宿迁市各层地下水水化学特征及成因进行分析,并对水质进行评价。水化学分析结果显示:研究区内地下水均为弱碱性水,阳离子以Ca^(2+)和Na^(+)为主,阴离子以HCO_(3)^(-)为主;潜水水化学类型以HCO_(3)·Cl-Na·Ca·Mg型为主,第Ⅰ承压水以HCO_(3)-Ca·Mg和HCO_(3)-Na·Ca·Mg型为主,第Ⅱ、Ⅲ承压水均以HCO_(3)-Ca·Na型为主;水化学组分主要受岩石风化作用影响,主要离子来源于碳酸盐岩、硅酸盐岩和蒸发盐岩的风化溶解,并受阳离子交换作用和反阳离子交换作用的影响。水质评价结果表明:第Ⅱ、Ⅲ承压水质优于潜水和第Ⅰ承压水,潜水水质以Ⅳ类水为主,其它含水层水质均以Ⅲ类水为主;影响地下水水质的主要化学组分是I^(-)、TH和Fe。In order to study the hydro-chemical characteristics and water quality status of groundwater in Suqian City,based on 77 groups of water sample data,hydro-chemical characteristics and genesis of groundwater at different aquifer in Suqian City were analyzed by classical statistics,Piper diagram,correlation analyses,Gibbs diagram,ion ratio and chloro alkaline indices method,and water quality was evaluated.The results of hydro-chemical analyses showed that groundwater in the study area was weakly alkaline,the main cation were Ca~(2+) and Na~+,and the main anion was HCO_3~-.The main hydro-chemical type of phreatic water was HCO_3·Cl-Na·Ca·Mg type,The main hydro-chemical types of the first confined groundwater were HCO_3-Ca·Mg and HCO_3-Na·Ca·Mg type,The main hydro-chemical types of the second and third confined groundwater was HCO_3-Ca·Na type.Hydro-chemical components were mainly affected by rock weathering,and the main ions were derived from the weathering and dissolution of carbonate,silicate and evaporative salt rock,and were affected by cation exchange and anti-cation exchange.The results of groundwater quality assessment showed that the second and third confined groundwater was better than that of the phreatic water and the first confined groundwater.The phreatic water quality was mainly Class IV water,and the groundwater quality of other aquifers were mainly Class III water.The main chemical components affecting groundwater quality were I~-,TH and Fe.

关 键 词：地下水 水化学特征 水质评价 宿迁市 

分 类 号：P641.12[天文地球—地质矿产勘探]