摘要
为研究塔里木盆地西部地下水水质状况及氟化物富集特征,以阿克陶县为例,采集并分析该地区3个含水层的地下水水样。运用改进后内梅罗评价和健康风险评价模型对该地区地下水进行评估,接着研究氟化物的富集机制。结果表明:通过改进后内梅罗水质评价,可知研究区较多地下水含水层采样点水质分布在Ⅱ类水和Ⅲ类水之间,但也存在个别含水层水样为Ⅳ类水;经健康风险评价模型分析,氟化物和氯化物在浅层水、中层水和深层水中所引起的总体健康风险(成人:1.28×10^(-6)a^(-1)、1.02×10^(-6)a^(-1)和9.36×10-7a^(-1),儿童:1.63×10^(-6)a^(-1)、1.30×10^(-6)a^(-1)和1.19×10^(-6)a^(-1))低于美国环境保护署(US EPA)推荐最大可接受风险值。浅层、中层和深层地下水水样氟化物超标率分别为57.14%、40.00%和60.00%,均值都超过限值(1.0 mg·L^(-1))。研究区地下水氟化物富集具有偏向碱性、富含Na+、缺乏Ca2+的特点,岩石风化、硅酸盐矿物溶解和离子交换对氟富集起促进作用。
To study groundwater quality and fluoride enrichment characteristics in the western Tarim Basin,Xinjiang,China,groundwater samples were collected and analyzed from three aquifers in the region,using Akto County as an example.The improved Nemerow assessment and health risk assessment model was used to evaluate local groundwater and study fluoride enrichment mechanisms.The results show that,through improved Nemerow water quality assessment,the water quality in many aquifer sampling points in the study area is distributed between typesⅡandⅢ,whereas some aquifer samples are typeⅣ.Furthermore,based on risk assessment model analysis,the overall health risks posed by fluoride and chloride in shallow,medium,and deep water samples(adults:1.28×10-6 a^(-1),1.02×10^(-6)a^(-1),and 9.36×10^(-7)a^(-1),children:1.63×10^(-6)a^(-1),1.30×10^(-6)a^(-1),and 1.19×10^(-6)a^(-1))are lower than the maximum permissible risk values set by the US Environmental Protection Agency(US EPA).The above standard rates of fluoride in shallow,medium,and deep groundwater samples were 57.14%,40.00%,and 60.00%,respectively,with all average values exceeding the limit(1.0 mg·L^(-1)).Fluoride enrichment in groundwater in the study area is characterized by being alkaline,rich in Na+and deficient in Ca^(2+).Rock weathering,dissolution of silicate minerals,and ion exchange promote fluorine enrichment.
作者
刘圣锋
高柏
张海阳
樊骅
蒋文波
LIU Shengfeng;GAO Bai;ZHANG Haiyang;FAN Hua;JIANG Wenbo(State Key Laboratory of Nuclear Resources and Environment,School of Water Resources and Environmental Engineering,East China Institute of Technology,Nanchang 330013,Jiangxi,China;Energy-saving and Environmental Protection and Occupational Safety and Health Research Institute Base of China Academy of Railway Sciences,Beijing 100081,China)
出处
《干旱区地理》
CSCD
北大核心
2021年第5期1261-1271,共11页
Arid Land Geography
基金
国家自然科学基金(41162007,41362011)
江西省重点研发计划(2018ACG70023)。
