摘要
为客观评价重庆市地下水氟化物污染风险,通过水化学特征、Gibbs图、相关性、矿物饱和指数和氯碱指数分析了重庆市浅层地下水中氟离子的分布特征及影响因素,并结合USEPA健康风险评估模型进行了健康风险评价。结果表明:①重庆市潜水和微承压水中F-浓度范围分别为0.05~2.97 mg/L和0.04~4.46 mg/L,超标率为9.30%和22.86%,水化学类型以SO_(4)·Cl-Mg型为主,其次为SO_(4)·Cl-Ca·Mg型及HCO_(3)-Na型,氟离子易在HCO_(3)-Ca·Mg型地下水中出现较高浓度;②高氟地下水在水平方向主要分布于重庆市西部和北部,在垂直方向主要表现为潜水层F-含量小于微承压水层;③含氟矿物的溶解是地下水中F-的主要来源,氟化物浓度主要受到阳离子交换作用的控制。研究成果表明重庆市浅层地下水中F-主要来源于萤石等含氟矿物溶解,高氟地下水主要受到蒸发浓缩作用及水文地球化学因素的影响,在长期饮用水摄入的暴露条件下,合川区、南川区东南部及梁平区北部的健康风险较高,建议区域内地下水经处理后再利用。
In order to objectively assess the risk of fluoride contamination in groundwater in Chongqing,the distribution characteristics and influencing factors of fluoride ions in shallow groundwater in Chongqing were analyzed by hydrochemical characteristics,Gibbs diagram,correlation,mineral saturation index and chloride index,and the health risk evaluation was carried out in conjunction with the USEPA health risk assessment model.The results showed that:①The concentration range of Fˉin submerged and micro-pressurized water in Chongqing was 0.05~2.97 mg/L and 0.04~4.46 mg/L respectively,with the exceedance rate of 9.30%and 22.86%,and the water chemistry type was dominated by SO_(4)-Cl-Mg type,followed by SO_(4)-Cl-Ca-Mg type and HCO_(3)-Na type,and fluoride ions were easy to be found in HCO_(3) Ca-Mg type groundwater,and fluoride ions concentration tend to be high in HCO_(3)-Ca-Mg type groundwater;②In horizontal respect,the highly fluoridated groundwater was mainly distributed in the western and northern parts of Chongqing,and vertically the concentration in submerged water was less than that in slightly pressurized water;③The dissolution of fluoride-containing minerals was the main source of Fˉin the groundwater,and fluoride concentration was mainly controlled by cation-exchange effect.The research results showed that Fˉin shallow groundwater in Chongqing City mainly originated from the dissolution of fluoride-containing minerals such as fluorite,and highly fluoridated groundwater was mainly affected by evaporation and concentration effects and hydrogeochemical factors.Under the exposure conditions of long-term drinking water intake,the health risks in Hechuan District,southeastern Nanchuan District,and northern Liangping District were relatively high,and it was recommended that the groundwater in these region should be treated before utilization.
作者
吕平毓
兰峰
赵康
骆辉煌
LYU Pingyu;LAN Feng;ZHAO Kang;LUO Huihuang(Upper Changjiang River Bureau of Hydrological and Water Resources Survey,Bureau of Hydrological of Changjiang Water Resources Commission,Chongqing 400020,China;School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Institute of Water Ecological Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《人民长江》
北大核心
2023年第9期41-49,共9页
Yangtze River
基金
长江生态环境保护修复联合研究二期项目(2022-LHYJ-02-0303)。
关键词
地下水
氟化物
水化学
阳离子交换
重庆市
groundwater
fluoride
hydrogeochemistry
cation exchange
Chongqing City
