摘要
延安组地下水是神东矿区重要的地下饮用含水层,其F^(-)含量的高低,直接影响着饮水的安全和周边的生态环境。然而,该地区延安组地下水中F^(-)的含量特征,空间分布和形成机制则很少被关注。项目组2020年8—9月系统采集了30组延安组地下水,采用Piper图、相关性分析、PHREEQC模拟等手段,在矿物溶解与沉淀,蒸发浓缩,阳离子交换,竞争吸附和人为污染作用等方面探讨了延安组地下水中F^(-)的含量特征,空间分布和形成机制。结果表明,神东矿区延安组地下水中F^(-)含量浓度范围为ND~17.60 mg/L,平均值为4.55 mg/L,相比国家生活饮用水卫生标准(GB 5749—2006)(1.0 mg/L),有73.3%的样品超标。高TDS、Cl^(-)、HCO_(3)^(-)、Na^(+)和低Ca^(2+)和Mg^(2+)水环境有利于F^(-)的富集,Na-HCO_(3)型、Na-HCO_(3)-Cl型和Na-HCO_(3)-SO_(4)型是高氟水的主要水化学类型。含氟矿物溶解是延安组地下水F^(-)的重要来源。蒸发岩溶解、硅酸盐风化下产生的盐效应降低了含氟矿物的溶解度,促进了F^(-)的溶出;阳离子交换通过钠钙转移进一步加快了含氟矿物的溶解;竞争吸附作用下吸附态氟也为地下水F^(-)提供了另外的来源。然而,蒸发浓缩与人类活动作用对延安组地下水F^(-)含量的升高影响较小,可忽略不计。该成果为当地饮水用水质安全和生态环境可持续发展提供了科学依据。
Yan'an Formation groundwater is an important underground drinking aquifer in the Shendong mining area,and the level of its F^(-) content directly affects the safety of drinking water and the surrounding ecological environment.However,the characteristics of F^(-) content,spatial distribution and formation mechanism in groundwater of the Yan'an Formation in this region have received little attention.The project team systematically collected 30 groups of Yan'an Formation groundwater in August-September 2020,and explored the characteristics of F^(-) content,spatial distribution and formation mechanism in Yan'an Formation groundwater in terms of mineral dissolution and precipitation,evaporation,cation exchange,competitive adsorption and anthropogenic pollution effects by using Piper diagram,correlation analysis,PHREEQC simulation,etc.The results showed that the concentration of F^(-) in groundwater of the Yan'an Formation in the Shendong mining area ranged from ND to 17.60 mg/L,with an average value of 4.55 mg/L.Compared with the national sanitary standard for domestic drinking water(GB 5749—2006)(1.0 mg/L),73.3%of the samples exceeded the standard.High TDS,Cl^(-),HCO_(3)^(-),Na^(+) and low Ca^(2+) and Mg^(2+) water environment are favorable for F^(-) enrichment,and Na-HCO_(3) type,Na-HCO_(3)-Cl type and Na-HCO_(3)-SO_(4) type are the main hydrochemical types of high fluoride water.Fluoride-bearing mineral dissolution is an important source of groundwater F^(-) in the Yan'an Formation.The salt effect under evaporite dissolution and silicate weathering reduces the solubility of fluoride-bearing minerals and promotes the dissolution of F;cation exchange further accelerates the dissolution of fluoride-bearing minerals through sodium-calcium transfer,adsorbed state fluorine under competitive adsorption also provides an additional source of groundwater F^(-).However,the effects of evaporation and human activities on the elevated F^(-) content of groundwater in the Yan'an Formation are small and negligible.The results pro
作者
解国强
张伟
郝春明
XIE Guo-qiang;ZHANG Wei;HAO Chun-ming(National EnergyShenhua Shendong Coal Group Co., Ltd., Geological Survey Company, Ordos 017209, China;School of Safety Engineering, North China Institute of Science and Technology, Langfang 065201, China)
出处
《科学技术与工程》
北大核心
2022年第19期8554-8561,共8页
Science Technology and Engineering
基金
河北省自然科学基金(D2021508004)
“煤炭开采水资源保护与利用”国家重点实验室开放课题项目(SHJ-17-42.17)
河北省硕士研究生创新项目(CXZZSS2021166)。
关键词
氟化物
空间分布
来源
富集机制
延安组含水层
fluoride
spatial distribution
source
enrichment mechanism
Yan'an aquifer
