Article(id=1307086242022183107, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086088166732376, articleNumber=null, orderNo=null, doi=10.12401/j.nwg.2025113, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1716566400000, receivedDateStr=2024-05-25, revisedDate=1756051200000, revisedDateStr=2025-08-25, acceptedDate=1756310400000, acceptedDateStr=2025-08-28, onlineDate=1789563244586, onlineDateStr=2026-09-16, pubDate=1787155200000, pubDateStr=2026-08-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789563244586, onlineIssueDateStr=2026-09-16, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789563244586, creator=13701087609, updateTime=1789563244586, updator=13701087609, issue=Issue{id=1307086088166732376, tenantId=1146029695717560320, journalId=1306274195778404443, year='2026', volume='59', issue='4', pageStart='1', pageEnd='386', issueExtLink='null', onlineDate='null', pubDate='1787155200000', pubDateStr='2026-08-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1789563207904, creator='13701087609', updateTime=1789616196824, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1307308339885531645, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086088166732376, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1307308339885531646, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086088166732376, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=339, endPage=353, ext={EN=ArticleExt(id=1307086242697466052, articleId=1307086242022183107, tenantId=1146029695717560320, journalId=1306274195778404443, language=EN, title=Hydrogeochemical Characteristics and Human Health Risk Assessment of Groundwater in a Industrial and Agricultural Area of Guanzhong Plain, columnId=null, journalTitle=Northwestern Geology, columnName=null, runingTitle=null, highlight=null, articleAbstract=

The protection of groundwater environment is a critical foundation for the sustainable utilization of regional water resources. To address the issues of groundwater quality characteristics and human health risks in industrial and agricultural area of Guanzhong plain, this study systematically collected 38 groundwater samples and comprehensively applied mathematical statistics, Piper trilinear diagram, ion ratio analysis, and entropy-weighted water quality index (EWQI) methods to analyze hydrochemical characteristics and assess health risks. The results indicate that: ① The concentration order of cations is Na+>Mg2+>Ca2+>K+, while the concentration order of anions is HCO3−>SO42−>Cl−>NO3−, with the main hydrochemical types being Na-Cl-SO4 and Na-Ca-HCO3; ② The hydrochemical evolution is dominated by dolomite dissolution and cation exchange, and the distribution of NO3− concentrations is closely related to industrial activities; ③ EWQI evaluation shows that 92.1% of the samples are suitable for drinking, with poor-quality water mainly concentrated in the industrial agglomeration area in the central-southern part of the region; ④ Human health risk assessment of F− and NO3− indicates that the non-carcinogenic health risks for different populations follow the order: children>adult females>adult males. It is recommended to reduce health risks through targeted measures such as optimizing industrial layout and controlling agricultural non-point source pollution. The research results provide a scientific basis for groundwater pollution prevention and sustainable management in the Loess Tableland region.

, authors=Yingying QIAO1, Si WANG2, Xiaofeng LUO1, Yan WANG1, Xi WANG3, Yunhui ZHANG4, *, authorsList=Yingying QIAO, Si WANG, Xiaofeng LUO, Yan WANG, Xi WANG, Yunhui ZHANG, authorCompany=null, correspAuthors=Yunhui ZHANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Northwestern Geology. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1307086252365336827, articleId=1307086242022183107, tenantId=1146029695717560320, journalId=1306274195778404443, language=CN, title=关中平原某工农业区地下水水文地球化学特征及人体健康风险评估, columnId=1307047819974570720, journalTitle=西北地质, columnName=非主题, runingTitle=null, highlight=null, articleAbstract=

地下水环境保护是区域水资源可持续利用的关键基础。针对关中平原某工农业区地下水水质特征与人体健康风险问题,本研究系统采集38组地下水样品,综合运用数理统计、Piper三线图、离子比值分析及熵权水质指数法(EWQI)等方法开展水化学特征解析与健康风险评估。研究表明:①水化学阳离子的浓度顺序为Na+>Mg2+>Ca2+>K+,阴离子的浓度顺序为HCO3−>SO42−>Cl−>NO3−,主要水化学类型为Na-Cl-SO4和Na-Ca-HCO3型;②水化学演化受白云石溶解和阳离子交换作用主导,NO3−浓度高低分布与工业活动密切相关;③EWQI评价显示92.1%样品水质适宜饮用,劣质水集中分布于中南部的工业聚集区;④针对F−和NO3−人类健康风险评估表明,不同人群的非致癌人类健康风险顺序为:儿童>成年女性>成年男性。建议通过优化工业布局、控制农业面源污染等针对性措施降低健康风险。研究成果为黄土塬区地下水污染防治与可持续管理提供了科学依据。

, authors=乔英英1, 王斯2, 罗小凤1, 王艳1, 王西3, 张云辉4, *, authorsList=乔英英, 王斯, 罗小凤, 王艳, 王西, 张云辉, authorCompany=null, correspAuthors=张云辉, authorNote=

乔英英(1984−),女,高级工程师,主要从事地质试验及环境水和土壤污染来源、传播和污染控制研究。E-mail:

, correspAuthorsNote=
张云辉(1990−),男,副教授,博士,主要从事水文地质与环境地质教学科研工作。E−mail:。
, copyrightStatement=版权所有©《西北地质》编辑部 2026, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=awfKZFMr4bJg7KxS8DLcEg==, magXml=cXU/rvapBZw5Fg2Cj4c9tw==, pdfUrl=null, pdf=QE8T2XymccL8JmnZouaCzQ==, pdfFileSize=2198099, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=Y8UTzrbEfFDMz4IwVenUNA==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=yFkkSEk3T7pqa3D+f9aVEg==, mapNumber=null, fund=null)}, authors=[Author(id=1307086254953222409, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=350033031@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1307086255032914187, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, authorId=1307086254953222409, language=EN, stringName=Yingying QIAO, firstName=Yingying, middleName=null, lastName=QIAO, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1Comprehensive Analysis Test Co., ltd, Zhongshan Nuclear Industry Group, Xi’an 710038, Shaanxi, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1307086255100023052, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, authorId=1307086254953222409, language=CN, stringName=乔英英, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1中陕核工业集团综合分析测试有限公司,陕西 西安 710038, bio={"content":"

乔英英(1984−),女,高级工程师,主要从事地质试验及环境水和土壤污染来源、传播和污染控制研究。E-mail:

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Human and Ecological Risk Assessment, 2020a, 26(9): 2349−2366., articleTitle=null, refAbstract=null), Reference(id=1307086283449323929, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=53, rfOrder=78, authorNames=null, journalName=null, refType=null, unstructuredReference=Zhang Q Y, Xu P P, Qian H. Groundwater Quality Assessment Using Improved Water Quality Index (WQI) and Human Health Risk (HHR) Evaluation in a Semi-arid Region of Northwest China[J]. 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articleId=1307086242022183107, language=CN, label=图6, caption=地下水主要离子及其比值系数相关性图

a. Cl−与Na+;b. SO42−与Ca2+;c. HCO3−与Ca2+ ;d. Mg2+/Na+与Ca2+/Na+ ;e. HCO3−/Na+与Ca2+/Na+ ;f. HCO3−+ SO42−与Ca2+ + Mg2+;g. (Ca2+ + Mg2+)−(HCO3−+ SO42−) 与Na+ + K+−Cl−;h. CAI-Ⅱ与CAI-Ⅰ;i. SI与TDS

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Water quality grading standard based on EWQI value

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等级EWQI值水质评价
10<值<25优秀
225≤值<50良好
350≤值<100中等
4100≤值<150差
5值≥150极差
), ArticleFig(id=1307086264583344449, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, language=CN, label=表1, caption=

基于EWQI值的水质分级标准

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等级EWQI值水质评价
10<值<25优秀
225≤值<50良好
350≤值<100中等
4100≤值<150差
5值≥150极差
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Exposure parameters in human health risk assessment

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参数(非致癌)单位儿童成年女性成年男性
经口摄入Ci 污染物浓度mg/L−−−
IR 饮水摄取率L/day0.71.51.5
EF 暴露频率days/year365365365
ED 持续暴露时间years123232
BW 体重(平均)kg26.85969.6
AT 非致癌暴露时间days4 38011 68011 680
RfDoral F 直接摄入参考剂量mg/(kg·day)0.040.040.04
RfDoral NO3直接摄入参考剂量mg/(kg·day)1.61.61.6
经皮肤接触K 皮肤渗透系数cm/h0.0010.0010.001
Ci 污染物浓度mg/L−−−
t 接触持续时间h/day0.40.40.4
CF 转换因子−0.0010.0010.001
EV 洗漱频率times/day111
SA 皮肤接触面积cm28 905.4116 246.8218 230.74
BH 身高(平均)cm99.4158.00169.70
EF 暴露频率days/year200200200
ED 持续暴露时间years123232
BW 体重(平均)kg26.85969.6
AT 非致癌暴露时间days4 38011 68011 680
RfDderm F皮肤接触参考剂量mg/(kg·day)0.040.040.04
RfDderm NO3直接摄入参考剂量mg/(kg·day)1.61.61.6
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人体健康风险评估中的暴露参数

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参数(非致癌)单位儿童成年女性成年男性
经口摄入Ci 污染物浓度mg/L−−−
IR 饮水摄取率L/day0.71.51.5
EF 暴露频率days/year365365365
ED 持续暴露时间years123232
BW 体重(平均)kg26.85969.6
AT 非致癌暴露时间days4 38011 68011 680
RfDoral F 直接摄入参考剂量mg/(kg·day)0.040.040.04
RfDoral NO3直接摄入参考剂量mg/(kg·day)1.61.61.6
经皮肤接触K 皮肤渗透系数cm/h0.0010.0010.001
Ci 污染物浓度mg/L−−−
t 接触持续时间h/day0.40.40.4
CF 转换因子−0.0010.0010.001
EV 洗漱频率times/day111
SA 皮肤接触面积cm28 905.4116 246.8218 230.74
BH 身高(平均)cm99.4158.00169.70
EF 暴露频率days/year200200200
ED 持续暴露时间years123232
BW 体重(平均)kg26.85969.6
AT 非致癌暴露时间days4 38011 68011 680
RfDderm F皮肤接触参考剂量mg/(kg·day)0.040.040.04
RfDderm NO3直接摄入参考剂量mg/(kg·day)1.61.61.6
), ArticleFig(id=1307086265350902084, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, language=EN, label=Tab.3, caption=

Statistical analysis of main indexes of groundwater

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主要指标pHTH (mg/L)TDS (mg/L)K+ (mg/L)Na+ (mg/L)Ca2+ (mg/L)
最大值9.701583.0011024.001500.002117.50116.00
最小值7.1028.00274.000.4110.971.41
平均值7.68579.131461.5343.07301.2747.04
标准差0.43355.721683.70242.81321.6028.00
变异系数0.060.611.155.641.070.60
峰度13.370.9429.8637.9529.150.08
偏度2.980.955.196.165.090.93
主要指标Mg2+ (mg/L)Cl− (mg/L)NO3− (mg/L)SO42- (mg/L)F− (mg/L)HCO3− (mg/L)
最大值339.004576.5047.20988.003.284405.10
最小值0.763.160.0021.000.3166.04
平均值97.56310.459.80326.351.14661.82
标准差72.31723.2711.51202.170.60662.06
变异系数0.742.331.170.620.521.00
峰度2.4335.222.581.603.5029.28
偏度1.355.841.620.851.485.11
), ArticleFig(id=1307086265459953989, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086242022183107, language=CN, label=表3, caption=

地下水主要指标统计分析

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主要指标pHTH (mg/L)TDS (mg/L)K+ (mg/L)Na+ (mg/L)Ca2+ (mg/L)
最大值9.701583.0011024.001500.002117.50116.00
最小值7.1028.00274.000.4110.971.41
平均值7.68579.131461.5343.07301.2747.04
标准差0.43355.721683.70242.81321.6028.00
变异系数0.060.611.155.641.070.60
峰度13.370.9429.8637.9529.150.08
偏度2.980.955.196.165.090.93
主要指标Mg2+ (mg/L)Cl− (mg/L)NO3− (mg/L)SO42- (mg/L)F− (mg/L)HCO3− (mg/L)
最大值339.004576.5047.20988.003.284405.10
最小值0.763.160.0021.000.3166.04
平均值97.56310.459.80326.351.14661.82
标准差72.31723.2711.51202.170.60662.06
变异系数0.742.331.170.620.521.00
峰度2.4335.222.581.603.5029.28
偏度1.355.841.620.851.485.11
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Results of groundwater health risk assessment in the study area

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群体最小值最大值平均值标准差
HI-氟化物男性0.171.770.620.32
女性0.202.090.730.37
儿童0.202.150.750.38
HI-硝酸盐男性0.000.640.130.15
女性0.000.750.160.18
儿童0.000.770.160.19
HI-总男性0.181.780.750.28
女性0.212.100.880.33
儿童0.222.160.910.34
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研究区地下水健康风险评估结果

, figureFileSmall=null, figureFileBig=null, tableContent=
群体最小值最大值平均值标准差
HI-氟化物男性0.171.770.620.32
女性0.202.090.730.37
儿童0.202.150.750.38
HI-硝酸盐男性0.000.640.130.15
女性0.000.750.160.18
儿童0.000.770.160.19
HI-总男性0.181.780.750.28
女性0.212.100.880.33
儿童0.222.160.910.34
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关中平原某工农业区地下水水文地球化学特征及人体健康风险评估
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乔英英 1 , 王斯 2 , 罗小凤 1 , 王艳 1 , 王西 3 , 张云辉 4, *
西北地质 | 非主题 2026,59(4): 339-353
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西北地质 |非主题 2026 , 59 (4) : 339 -353
关中平原某工农业区地下水水文地球化学特征及人体健康风险评估
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乔英英1 , 王斯2, 罗小凤1, 王艳1, 王西3, 张云辉4, *
作者信息
  • 1中陕核工业集团综合分析测试有限公司,陕西 西安 710038
  • 2四川省自然资源实验测试研究中心,四川 成都 610000
  • 3中国地质调查局西安矿产资源调查中心,陕西 西安 710000
  • 4西南交通大学地球科学与工程学院,四川 成都 611756
通讯作者:
张云辉(1990−),男,副教授,博士,主要从事水文地质与环境地质教学科研工作。E−mail:。
作者简介:

乔英英(1984−),女,高级工程师,主要从事地质试验及环境水和土壤污染来源、传播和污染控制研究。E-mail:

Hydrogeochemical Characteristics and Human Health Risk Assessment of Groundwater in a Industrial and Agricultural Area of Guanzhong Plain
Yingying QIAO1 , Si WANG2, Xiaofeng LUO1, Yan WANG1, Xi WANG3, Yunhui ZHANG4, *
Affiliations
  • 1Comprehensive Analysis Test Co., ltd, Zhongshan Nuclear Industry Group, Xi’an 710038, Shaanxi, China
  • 2Sichuan Province Natural Resources Experimental Test Research Center, Chengdu 610000, Sichuan, China
  • 3Xi 'an Mineral Resources Survey Center of China Geological Survey, Xi’an 710000, Shaanxi, China
  • 4Faculty of Geosciences and Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China
出版时间: 2026-08-20 doi: 10.12401/j.nwg.2025113
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地下水环境保护是区域水资源可持续利用的关键基础。针对关中平原某工农业区地下水水质特征与人体健康风险问题,本研究系统采集38组地下水样品,综合运用数理统计、Piper三线图、离子比值分析及熵权水质指数法(EWQI)等方法开展水化学特征解析与健康风险评估。研究表明:①水化学阳离子的浓度顺序为Na+>Mg2+>Ca2+>K+,阴离子的浓度顺序为HCO3−>SO42−>Cl−>NO3−,主要水化学类型为Na-Cl-SO4和Na-Ca-HCO3型;②水化学演化受白云石溶解和阳离子交换作用主导,NO3−浓度高低分布与工业活动密切相关;③EWQI评价显示92.1%样品水质适宜饮用,劣质水集中分布于中南部的工业聚集区;④针对F−和NO3−人类健康风险评估表明,不同人群的非致癌人类健康风险顺序为:儿童>成年女性>成年男性。建议通过优化工业布局、控制农业面源污染等针对性措施降低健康风险。研究成果为黄土塬区地下水污染防治与可持续管理提供了科学依据。

地下水  /  水化学特征  /  地下水质量  /  人体健康风险

The protection of groundwater environment is a critical foundation for the sustainable utilization of regional water resources. To address the issues of groundwater quality characteristics and human health risks in industrial and agricultural area of Guanzhong plain, this study systematically collected 38 groundwater samples and comprehensively applied mathematical statistics, Piper trilinear diagram, ion ratio analysis, and entropy-weighted water quality index (EWQI) methods to analyze hydrochemical characteristics and assess health risks. The results indicate that: ① The concentration order of cations is Na+>Mg2+>Ca2+>K+, while the concentration order of anions is HCO3−>SO42−>Cl−>NO3−, with the main hydrochemical types being Na-Cl-SO4 and Na-Ca-HCO3; ② The hydrochemical evolution is dominated by dolomite dissolution and cation exchange, and the distribution of NO3− concentrations is closely related to industrial activities; ③ EWQI evaluation shows that 92.1% of the samples are suitable for drinking, with poor-quality water mainly concentrated in the industrial agglomeration area in the central-southern part of the region; ④ Human health risk assessment of F− and NO3− indicates that the non-carcinogenic health risks for different populations follow the order: children>adult females>adult males. It is recommended to reduce health risks through targeted measures such as optimizing industrial layout and controlling agricultural non-point source pollution. The research results provide a scientific basis for groundwater pollution prevention and sustainable management in the Loess Tableland region.

groundwater  /  hydrochemical characteristics  /  groundwater quality  /  human health risk
乔英英, 王斯, 罗小凤, 王艳, 王西, 张云辉. 关中平原某工农业区地下水水文地球化学特征及人体健康风险评估. 西北地质, 2026 , 59 (4) : 339 -353 . DOI: 10.12401/j.nwg.2025113
Yingying QIAO, Si WANG, Xiaofeng LUO, Yan WANG, Xi WANG, Yunhui ZHANG. Hydrogeochemical Characteristics and Human Health Risk Assessment of Groundwater in a Industrial and Agricultural Area of Guanzhong Plain[J]. Northwestern Geology, 2026 , 59 (4) : 339 -353 . DOI: 10.12401/j.nwg.2025113
水资源是地球上生物体赖以生存的物质基础,在人类经济社会发展过程中不可或缺(Li et al., 2020)。地下水是十分重要的水资源,亦是地球上最充足、分布最广泛的淡水资源。因其具有水量稳定、水质清洁等优点,是居民饮用和工农业生产的重要水源(Xu et al., 2019;Gao et al., 2024)。西北地区地表水在水资源总量中占比较低,地下水是主要的供水水源,尤其在一些干旱地区甚至是唯一的水源(Li et al., 2018a)。然而,现今因气候变化和人类活动(工业生产、农业活动等)强度增大,包括中国在内的世界范围内地下水严重枯竭和污染,其极大地影响着农业生产和居民生活用水。因此,保证水资源质量成为当下最需要解决的问题之一。当前,开展地下水水文地球化学调查,评估水质质量和评价人体健康风险对于地下水资源的持续开发和利用、控制地下水污染和维护安全饮用水至关重要(Xu et al., 2019;Li et al., 2020;Adimalla et al., 2021;张帆等,2023;赵敏等,2025;李广英等,2026)。
中国西北地区大多属于干旱、半干旱气候,地表水季节性变化明显,地下水水质和水量相对稳定和有保障,成为该区主要供水水源之一。近年来,众多学者开展了干旱、半干旱地区地下水水化学特征、水质和人体健康风险评价等研究工作(苏贺,2018;Li et al., 2018b;Zhang et al., 2019;Wang et al., 2020;黄建军等,2021;杨明远等,2023;吴君毅等,2023;刘春燕,2024)。刘宜鑫等(2022)明确了西安市主城区地下水水化学特征并进行了水质评价;Zhang et al.(2020a)调查了中国泾惠渠灌区(陕西中部)地下水化学特征、过程和控制因素,还使用健康风险评估模型量化了Cr6+ 对人类健康的影响。Zhang et al.(2020b)对中国的半干旱地区使用水质指数(WQI)评估,并选取硝酸盐和氟化物等作为指标,进一步对人体健康风险进行了评估,认为儿童更容易受到污染。
关中平原是陕西省人口分布最多,经济发展水平最高的区域(李慧,2018;刘宜鑫等,2022)。研究区位于陕西省中部,人口约46万,区内第一产业和第二产业分别为农业和工业。地下水是本区居民生活、农业和工业的重要水源。牟海斌等(2022)对研究区的地下水水化学特征与形成作用开展了研究,但该研究样品点分布广泛,可能导致局部特征被平均化,难以准确反映地下水系统的空间差异性。目前,研究区地下水研究基础薄弱,尤其缺乏对该区地下水水化学类型、水质质量及其空间分布等方面的研究。因此,急需开展研究区地下水水文化学地球特征及人体健康风险评估的研究,以期推进研究区以及关中平原的地下水资源可持续利用。
通过收集和整理研究区地质、水文地质资料,本研究旨在:①明晰研究区地下水水文地球化学成分的总体特征及其空间分布态势;②探究区内地下水主要离子来源;③通过计算区内熵权水质指数评价研究区地下水水质及掌握其空间分布规律;④计算健康风险总指数(HI),通过成年男性、成年女性和儿童的经口摄入和皮肤接触途径评估非致癌风险。研究成果对研究区乃至关中平原地下水资源的开发利用和管理具有重要的科学价值和指导意义。
研究区位于陕西省关中平原腹地(图1),泾河、渭河两岸,西安市北部。研究区东西长为20.55 km,南北宽为20.1 km,总面积为294 km2。地势自西北向东南倾斜,海拔为275~446 m,相对高差为171 m。北部为平川,占总面积的76.7%,主要为淤土,灌溉条件良好;偏南部为塬地(占14%),主要为娄土,塬面略有起伏,沟壑发育;滩地(占3.7%),地势低平,主要为潮土,土壤疏松(黄建军等,2021;牟海斌等,2022)。研究区属暖温带季风气候,最高气温为41.4 ℃,最低气温为−20.8 ℃,年平均气温为13.2 ℃,年降水量为540 mm(牟海斌等,2022)。
研究区的水域主要包括泾河和渭河,水域占全境面积的5.6%。渭河自西向东流经境域南部,境内流长约为20 km。泾河自西北向东南在泾渭镇泾渭堡东北流入渭河,境内流长为13 km(牟海斌等,2022)。区域含水层主要由第四系松散堆积物组成,自上而下可分为潜水含水层和承压水含水层。潜水含水层厚度较大,分布广泛;承压水含水层则厚度较小,分布不均。区内地下水分布、富水性及补给条件受地形地貌、河流水系影响显著。本区地形地貌由北至南依次划分为山前冲洪积平原、一级冲洪积平原、二级冲洪积平原、渭河三级阶地及泾河一级阶地。由北至南,靠近渭河,含水层岩性颗粒逐渐变粗,由山前冲洪积平原的粉细砂为主,变为泾河一级阶地的中粗砂为主,富水性逐渐变好。地下水径流方向与地形倾向一致,由西北流向东南排泄于渭河(牟海斌等,2022)。研究区冲积平原的潜水主要由大气降水、河水以及人工地表水体的渗入、承压水等补给。地下水排泄主要由垂直蒸发与水平排泄为主。
研究区位于关中盆地中部,处第四系固市凹陷与西安凹陷之间(刘林等,2018)。地层属华北地区层、汾渭分区、渭河小区。地质构造简单,地表出露地层单一。全境地表均被第四系覆盖,局部地段有第三系出露,未见基底岩裸露(刘林等,2018)。其中,出露的第四系地层为上更新统至全新统地层。上更新统上部为马栏组风积层,岩性为灰黄色疏松状垂直节理发育的砂质黄土,底部可见厚4~5 m富含钙质结核的古壤层,厚度为20~30 m。下部为乾县组冲积层,岩性为粘质砂土、砂质黏土及砂卵石层(未见底)。全新统上部冲积层分布于泾、渭河的河漫滩地带, 岩性为冲积砂、砂砾卵石层及亚砂土、亚黏土,厚度为2~38 m;下部冲积层分布于泾、渭河一级阶地冲积平原内,岩性为砂质黏土、粘质砂土、砂、砂卵石层,厚度约80 m。
研究区所处大地构造位置为汾渭断陷渭河断陷区域,地表覆盖层深厚,基底隐伏断层较多,主要有宝鸡−咸阳−渭南断层及泾阳−高陵−渭南断层组成地垒式结构的构造形式(曹建平等,2017;刘林等,2018)。宝鸡−咸阳−渭南断层为秦岭地槽褶皱带与陕甘宁台坳的分界,呈NEE向由宝鸡经咸阳延伸至渭南。该断层是一早期为压性,后期为张性的活跃性深层断裂,倾向南,倾角为70°~75°,断距大于1 000 m;泾阳−高陵−渭南断层经高陵南、零口、渭南东至华县附近,西段NW向,东段EW向,断层面北倾,倾角68°,断距大于1 000 m。其中,西段推测断层位置处地面平坦,仍处于隐伏状态,活动不明显,断层通过处黄土塬区有清楚陡坎,属晚近时期活动断裂(苏英等,2013;曹建平等,2017;黄建军等,2021)。
本研究采集包括民井和监测井(井深为21~70 m)在内的38件水样,样品主要集中在人类活动较多的西南地区(图1b)。采集水样前,使用手持GPS设备记录水样点地理位置。为了确保水质参数的准确结果,且尽量减少井眼积水的影响。现场采用贝勒管抽水法,使用大于三倍井眼积水的水量清洗生活井。用DS500系列便携式多参数水质仪实时监测水样,确保参数稳定后,采集水样,当采集井较深时采用贝勒管取水。水样采用550 ml高密度聚乙烯瓶保存,用DS500系列便携式多参数水质仪原位测量温度及pH等。所有样品收集后于4 ℃冷藏保存,送回中陕核工业集团测试分公司实验室后一周内进行分析。结合检测参数标准分析方法和《地下水环境监测技术规范》(HJ 164—2020)要求,在分析测试过程中从空白分析、精密度分析、准确度分析、中间点校准分析、 标准样品分析等方面进行质量控制。质量控制方式、频次及检测结果均满足标准分析方法和《地下水环境监测技术规范》(HJ 164—2020)的要求。研究区地下水TH采用玻璃电极法(GB/T 6920—1986),TDS采用溶解性固体总量测定的重量法(DZ/T 0064.9—2021)。阳离子(K+、Ca2+、Na+和Mg2+)采用电感耦合等离子体发射光谱法(HJ 776—2015)测定。阴离子(Cl−、SO42−和NO3−)采用离子色谱法(HJ 84—2016)测定,HCO3−采用滴定法(DZ/T 0064.49—1993)测定。研究区所有地下水样品按照《水质采样技术规范样品保存和处理(2019)》中相应方法采集和储存,均满足相应要求。据公式(1)计算所采集水样主要阳离子和阴离子的电荷平衡误差(CBE),其误差均为±5%。
$ CBE=\frac{{\displaystyle \sum 阳离子浓度-{\displaystyle \sum 阴离子浓度}}}{{\displaystyle \sum 阳离子浓度+{\displaystyle \sum 阴离子浓度}}} \times 100{\text{%}} $
本研究采用改进的WQI方法,利用熵权法对地下水质量进行评价。熵权法是一种客观赋权方法,是利用信息熵的工具计算各指标的权重,可以减少因忽略权重而带来的误差,为多个指标的综合评价提供依据。该方法将信息熵引入水质指标的定量评价中,以此消除人为主观对数据分析的影响,达到定量分析的目的(Li et al., 2010;Wang et al., 2022)。EWQI计算过程主要分为5个步骤。
(1)建立初始矩阵Xij,计算过程表达为公式(2)。
$ {X_{{\text{ij}}}} = {\left( {{x_{ij}}} \right)_{m \times n}} = \left[ {\begin{array}{*{20}{c}} {{x_{11}}}& \cdots &{{x_{1n}}} \\ \vdots & \ddots & \vdots \\ {{x_{m1}}}& \cdots &{{x_{mn}}} \end{array}} \right] $
式中:xij为原始测量数据;m为地下水样品个数;n为评价水化学指标个数。
(2)数据标准化,计算方法为公式(3)和公式(4)。
$ {y_{ij}} = \left\{ {\begin{array}{*{20}{l}} {\dfrac{{{x_{ij}} - {{({x_{ij}})}_{\min }}}}{{{{({x_{ij}})}_{\max }} - {{({x_{ij}})}_{\min }}}}} \\ {\dfrac{{{{({x_{ij}})}_{\max }} - {x_{ij}}}}{{{{({x_{ij}})}_{\max }} - {{({x_{ij}})}_{\min }}}}} \end{array}} \right. $
$ Y = {\left( {{y_{ij}}} \right)_{m \times n}} = \left[ {\begin{array}{*{20}{c}} {{y_{11}}}& \cdots &{{y_{1n}}} \\ \vdots & \ddots & \vdots \\ {{y_{m1}}}& \cdots &{{y_{mn}}} \end{array}} \right] $
式中:(yij)max为最大值,(yij)min为最小值。
(3)计算信息熵“ej”和熵权“wj”,计算过程表达为公式(5)~公式(7)。
$ {e_j} = - \frac{1}{{\ln m}}\sum\limits_{i = 1}^m {({P_{ij}} \times \ln } {P_{ij}}) $
$ {P_{ij}} = \frac{{{y_{ij}}}}{{\displaystyle \sum\nolimits_i^m {{y_{ij}}} }} $
$ {w_j} = \frac{{1 - {e_j}}}{{\displaystyle \sum\nolimits_{i = 1}^n {(1 - {e_j})} }} $
式中:Pij为样品i的第j个指标值。
(4)质量评定量表(qj),计算过程表达为公式(8)~公式(9)。
$ {q_{\text{j}}} = \frac{{{C_j}}}{{{S_j}}} \times 100 $
$ {q}_{\text{pH}}=\left\{\begin{array}{l}\dfrac{{C}_{\text{pH}}-7}{8.5-7}\times 100\text{,}\text{pH}>\text{7}\\ \dfrac{\text{7}-{C}_{\text{pH}}}{\text{7}-\text{6}\text{.5}}\times 100\text{,}\text{pH} \leqslant 7\end{array}\right. $
式中:“qj”是水化学指标分级的定量标度,由水化学组分浓度Cj及其相关饮水标准Sj计算得出。由于pH为无量纲数据,且规范为范围值,所以对其作单独计算公式qpH,其中CpH为pH的实测浓度值。
(5)计算EWQI值,计算过程表达为公式(10)。
$ {\text{EWQI}} = \sum\limits_{j = 1}^m {({w_j} \times {q_j})} $
按照EWQI分级(表1;Zhang et al., 2021)标准,规定EWQI>100时水体不适合人体饮用。
非致癌风险评价方法适用于评估长期暴露于低浓度污染物对人体健康的潜在影响(USEPA, 2009)。长期摄入过量氟离子导致氟斑牙和氟骨症等健康问题,但通常不直接引发癌症,属于非致癌健康风险;高浓度硝酸盐在体内可能转化为亚硝酸盐,进而引发蓝婴综合征,但其致癌性较弱,主要被视为非致癌健康风险。因此,本研究主要针对地下水中的F−和NO3−采用非致癌风险对研究区地下水的人体健康风险进行评价,采用美国环境保护署(USEPA)提出的健康风险评估数学模型对研究区潜在危害进行定量评估(USEPA, 2009)。污染水体可以通过多种途径对人体健康造成风险,例如皮肤接触(沐浴)和摄入水(口服)这两个直接途径(Jayarajan et al., 2021)。因此,本研究主要根据人体健康风险评估中的暴露参数(表2)和公式(11)~公式(16)对皮肤接触和经口摄入的非致癌风险进行评估(Wu et al., 2018;He et al., 2020;Zhang et al., 2021),选择儿童、成年男性和成年女性作为受体评估对象,分析过多接触和过量摄入研究区地下水中的F−和NO3−对儿童、成年男性和成年女性的健康危害程度。
(1) 计算饮用水中污染物的长期每日摄入量(CDI),计算过程表达为公式(11)。
$ CDI = \frac{{Ci \times IR \times EF \times ED}}{{BW \times AT}} $
(2) 计算经口摄入的危害商数HQoral,计算过程表达为公式(12)。
$ H{Q_{{\text{oral}}}} = \frac{{CDI}}{{R{\text{f}}{D_{{\text{oral}}}}}} $
(3) 计算用水中污染物的长期每日皮肤接触量(CDD),计算过程表达为公式(13)。
$ \begin{array}{c}CDD=(Ci\times K\times C\times t\times CF\times EV\times \\ SA\times EF\times ED)/(EW\times AT)\end{array} $
(4) 计算皮肤接触的危害商数HQderm,计算过程表达为公式(14)。
$ H{Q_{{\text{derm}}}} = \frac{{CDD}}{{R{\text{f}}{D_{{\text{derm}}}}}} $
(5) 计算健康风险总指数HI,计算过程表达为公式(15)~公式(16)。
$ HQ = H{Q_{{\text{oral}}}} + H{Q_{{\text{derm}}}} $
$ HI = \sum\limits_i^n {H{Q_i}} $
水文地球化学成分的统计分析通常用于分析水文地球化学的一般特征(Yidana et al., 2018;Feng et al., 2020)。本次对研究区地下水的pH、TH、TDS、K+、Ca2+、Mg2+、Na+、Cl−、F−、NO3−、HCO3−和SO42−共12个指标,对其最小值、最大值、均值、标准差、变异系数、峰度和偏度等参数进行统计分析(图2、表3)。此外,利用ArcGIS 10.7(地理信息系统软件)软件,采用反距离权重插值法(IDW)绘制了研究区地下水中TDS、K+、Mg2+、Ca2+、Na+、Cl−、NO3−、SO42−、HCO3−和F−质量浓度空间分布插值图(图3)。
研究区地下水pH值呈现出7.10~9.70的波动区间(均值为7.68),整体表现为弱碱性特征。总硬度(TH)范围为25~1 583 mg/L(均值为579.13 mg/L),参考《地下水质量标准》(GB/T 14848-2017),研究区大部分地下水样品总硬度超过 450 mg/L,主要处于硬水范围。TH异常值位于较大一侧(图2),表明数据分布呈右偏态,且其离散程度较为显著。溶解性总固体(TDS)范围为274.00~11 024.00 mg/L(均值为1 461.53 mg/L),其中有一处TDS浓度高达11 024.00 mg/L,未达到世界卫生组织(WHO, 2011)所规定的饮用标准(1 000 mg/L),箱体较扁代表TDS数据波动性较小(图2),说明大部分样品数据较稳定且离散程度小。TDS浓度较高区域主要分布在研究区东南部和东北部(图3)。地下水中阳离子K+、Ca2+、Mg2+和Na+的浓度范围分别为0.41~1 500.00 mg/L、1.41~116.00 mg/L、0.76~339.00 mg/L和10.97~2 117.50 mg/L(其均值依次为43.07 mg/L、47.04 mg/L、97.56 mg/L、301.27 mg/L)。Ca2+浓度数据的离散程度相对较大,并且主要集中在研究区西北部(图1,图2)。Mg2+浓度数据存在较多异常值且分布在较大值一侧,表明Mg2+的浓度数据不遵循正态分布,呈右偏态分布,其浓度空间分布主要集中在研究区西部。Na+浓度数据波动较小,数据稳定;其浓度空间分布主要集中在研究区东南部。阴离子Cl−、F−、NO3−、HCO3−和SO42−的浓度分别为3.16~4 576.50 mg/L、0.31~3.28 mg/L、0.00~47.20 mg/L、66.04~4 405.10 mg/L和21.00~988.00 mg/L(均值为310.45 mg/L、1.14 mg/L、9.80 mg/L、661.82 mg/L和326.35 mg/L)。其中,Cl−和HCO3−的浓度数据波动小且较为稳定,HCO3−浓度较高区域主要集中在研究区东南部。F−浓度较高区域主要分布在研究区西南部和东南部。NO3−数据存在较多异常值且集中在较大值一侧,表明NO3−浓度数据的分布呈右偏态分布,其浓度空间分布主要集中在研究区西北部。SO42−浓度较高区域主要集中在研究区东北部。值得注意的是,K+和Cl−浓度的空间分布相似,主要分布在研究区东南部,这暗示它们可能源于相同的人类活动。
基于研究区地下水中Na+、K+、Ca2+、Mg2+、Cl−、HCO3−和SO42−等测试数据绘制Piper三线图,以分析区域地下水水化学类型和组分特征(图4)。
区内水样阳离子的离子优势为Na+>Mg2+>Ca2+>K+,阴离子的离子优势为HCO3−>SO42−>Cl−>NO3−,阳离子和阴离子主要以Na+和HCO3−为主(表3,图4)。地下水化学类型主要为Na-Cl-SO4型和Na-Ca-HCO3型,前者占总体的31.6%,后者占总体的39.5%。
Gibbs图被广泛用于分析水体溶质组分成因类型(Gibbs, 1970),其构建原理是以TDS质量浓度值为对数纵坐标,以Cl−/(Cl−+HCO3−)和Na+/(Na++Ca2+)为横坐标,反映大气降水、岩石风化、蒸发结晶等天然因素对水化学形成过程的影响(刘林等,2023;郭高轩等,2024;朱春芳等,2025)。所测定的Cl−/(Cl−+HCO3−)和Na+/(Na++Ca2+)的离子比值分别为0.01~0.66和0.26~1.00。研究区域的样品离子主要集中分布于水岩作用影响区域(图5),揭示了水岩相互作用是研究区地下水化学形成的主要原因。部分水样呈现出向蒸发作用影响区域漂移的态势,可推断在该区域由于潜水埋深相对较浅,地下水化学组分亦受到蒸发作用影响。
水体中各离子组分的比值在研究水体离子来源方面具有关键作用,通过绘制研究区域内主要离子比值图,能够深入剖析研究区水文地球化学的演化进程(吴嘉铃等,2022;蔡磊等,2023)。岩盐溶解产生的Na+和Cl−的摩尔比为1∶1,所以Cl−/Na+常用来揭示地下水中Na+和Cl−的来源(Liu et al., 2022;Wu et al., 2018)。研究区大部分地下水样品处于盐岩溶解y=x线以下(图6a)。Cl−/Na+值为0.02~1.40,平均值为0.53,且Na+浓度显著高于Cl−浓度。由此可推断,Na+和Cl−并非源于盐岩溶解过程,过量的Na+可能来源于矿物风化作用或离子交换过程。假设SO42−和Ca2+比值接近于1,可判断地下水中SO42−和Ca2+主要来源于硫酸盐矿物的溶解反应(李晓等,2018;Wang et al., 2023)。研究区大部分地下水样品分布于石膏溶解的y=x线之上,且未在y=x溶解线附近(图6b),表明样品中SO42−和Ca2+的主要来源为石膏溶解,但并非唯一来源,推测可能存在阳离子交换作用,导致Ca2+ 浓度降低,或者存在其他硫酸盐矿物的溶解,导致SO42−浓度升高。通过分析Ca2+和HCO3−的比值图(图6c),可知研究区多数样本处于白云石溶解y=2x线上方,仅有极少部分样品处于白云石溶解线y=2x和方解石溶解线y=x的过渡区域,意味着研究区地下水中Ca2+和HCO3−主要来源于白云石溶解(Yao et al., 2022),极少部分受到方解石溶解的影响。为进一步探究水岩相互作用的影响方式,利用端元法,依据Mg2+/Na+、Ca2+/Na+以及HCO3−/Na+值,将样品离子的主要来源划分为碳酸盐岩、硅酸盐岩和蒸发盐岩这3种类型(Xing et al., 2013)。在Mg2+/Na+和Ca2+/Na+的离子比图(图6d、图6e)中,地下水样品集中分布于硅酸盐岩和蒸发岩之间的过渡区域且围绕硅酸盐岩端分布;HCO3−/Na+和Ca2+/Na+的离子比值图中,研究区地下水样品主要位于硅酸盐岩与碳酸盐岩的过渡区域,且靠近硅酸盐岩端元,这充分表明研究区地下水主要受硅酸盐矿物风化作用的显著影响。
HCO3−+SO42−和Ca2++Mg2+二者的比值图可用于分析水中碳酸盐岩和硅酸盐岩的反应情况,如果仅受此两类岩石控制平衡,样点会分布在y=x溶解线上(黄珣等,2024;罗欢等,2024)。地下水样品主要分布在y=x线上方(图6f),进一步证实了硅酸盐风化对地下水化学组成具有显著影响,与上述分析一致。(Na++K+−Cl−)与(Ca2++Mg2+)−(HCO3−+SO42−)的比值也反映了离子交换的存在。氯碱指数CAI-I和CAI-II是判定含水层中发生离子交换的重要指标(Kumar et al., 2018),可由公式(17)和公式(18)来计算。
$ CAI-\mathrm{Ⅰ}=(C{l}^--(N{a}^++{K}^+))/C{l}^- $
$ CAI-\mathrm{Ⅰ}=(C{l}^--(N{a}^++{K}^+))/(HC{O}_{3}^-+S{O}_{4}^{2-}+C{O}_{3}^{2-}+N{O}_{3}^-) $
地下水中的CAI值大多数小于零(图6h),表示在研究区中各样品存在阳离子交换过程。矿物饱和指数(SI)作为衡量水与矿物之间处于溶解或沉淀状态的关键参数,在水文地球化学研究领域具有重要意义(袁兴成等,2023;邓承东等,2025)。本研究借助PHREEQC 3.9软件计算方解石、白云石、石膏和岩盐的饱和指数(图6i),地下水样品中方解石的SI平均值为0.10,白云石的SI平均值为0.77,表明研究区地下水方解石、白云石表现出较饱和的特征;地下水样品中的石膏和岩盐的SI平均值分别为–0.83和–6.14,表明石膏和岩盐均处于未饱和状态。
在地下水环境遭受人为活动显著影响的情形下,其中的NO3−和Cl−的浓度会呈现升高态势,并且NO3−/Na+和Cl−/Na+值越高,则表明人为活动对研究区地下水影响程度越大(彭红霞等,2021)。在NO3−/Na+和Cl−/Na+值图(图7a、图7b )中,地下水样品主要分布在城市污水端和农业活动端之间的区域,然而其分布态势较分散;在SO42−/Na+和NO3−/Na+值图中,研究区域内SO42−浓度大于NO3−浓度,且样品点偏向工业活动一侧。由此推断地下水中的NO3−和Cl−的浓度主要受到城市工业污水的影响,同时部分受到农业活动污水的作用。
熵权水质指数(EWQI)是评估地下水是否适合饮用的重要工具,可以减少因忽略权重而带来的误差,为多个指标的综合评价提供依据(Xiao et al., 2021)。根据本研究实验结果,可将水质指标等级分为5级,分别为优秀(25)、良好(25~50)、中等(50~100)、差(100~150)和极差(≥150)。其中,水质等级为“优秀”和“良好”的地下水水质较好且适合饮用。本研究计算结果表明,EWQI值波动范围在10.56~703.53,平均值为70.17。研究区大部分地下水样品都处于“良好”和“中等”区域(图8a),13.16%的样品处于“优秀”区域,34.21%的样品属于“良好”类别,44.74%的样品属于“中等”范畴。存在3个样品的EWQI值大于100,其水质表现为极差,不适宜人体饮用。
利用ArcGIS 10.7软件对EWQI开展反距离权重插值分析可知,研究区水质整体呈现出以中良为主的特征(图8b)。地下水样品EWQI值超过安全饮用限值的区域主要集中在研究区中南部,该区域以城镇区为主(涵盖工矿用地及城镇建成区)。由于工业废水及生活污水的大量排放,导致该区域水质恶化。此外,由于研究区地形呈现西北向东南倾斜的态势,这种地形特征促使该区域地下水中各种化学成分易于积聚,进而导致水体污染加重。因此,未来更需要重视研究区中南部地区地下水的长期保护及动态监测,以保障地下水环境的可持续性与安全性,为区域水资源合理运用及生态环境保护提供支持。
本研究采用美国国家环境保护署健康风险评价模型(USEPA, 2009)对研究区地下水中的F−和NO3−进行计算分析。主要计算了成年男性、成年女性和儿童因经口摄入和皮肤接触F−和NO3−而产生的健康风险总指数(HI)(表4)。其中,成年男性的HI总值为0.18~1.78(平均值为0.75),成年女性的HI总值为0.21~2.10(平均值为0.88),儿童的HI总值为0.22~2.16(平均值为0.91)。结果显示,对成年女性和儿童而言,均有4.5%的水样其非致癌风险指数超过1,而成年男性有3%的水样非致癌风险指数超过1,这表明本研究区域总体上对人体健康的风险处于相对较低水平,然而,相较于成年男性,成年女性和儿童群体更易遭受F−和NO3−污染所带来的健康损害。此外,通过进一步计算比较发现,研究区健康风险总指数构成中,F−和NO3−的健康风险指数分别占健康风险总指数的82.29%和17.71%,这表明相较于硝酸盐,在饮用该研究区地下水时,人体健康更容易受到F−的影响。
基于GIS软件中的反距离权重插值技术,在研究区地图上对非致癌人类健康风险的空间分布进行了可视化呈现。儿童群体的非致癌健康风险区域面积最大,约占研究区的近1/4区域,且HI总值较高区域集中分布在研究区南部和西南部(图9d )。与儿童相比,成年女性和男性的非致癌健康风险区域面积相对较小,且集中在研究区的西南部。总体而言,非致癌健康风险区域面积大小顺序依次为儿童>成年女性>成年男性。
本研究中,地下水中F−和NO3−的浓度受到多种因素影响,其中工业活动的影响较为显著,同时也受到农业活动和城市污水的部分影响(例如工业有机废水排放、生活污水的渗入和磷肥的生产和使用等)。人类若长期摄入硝酸盐浓度高的地下水,将会遭受一系列健康风险(如蓝婴综合症、食管癌、胃癌、甲状腺肥大等)(Zhang et al., 2021)。过量吸收氟化物,会让儿童的恒牙发育受到影响;氟污染也可以使动、植物中毒,进而对农业和牧业生产等造成负面影响(赵增锋等,2023)。因此,针对NO3−所引发的人类健康风险,相应的针对性措施应聚焦于工农业活动的改进上,包括减少氮肥的使用、改变灌溉方式等;严格控制工业废水、生活污水的排放量,选择科学的施肥和科学的田间管理模式等措施来降低饮用水水源中的硝酸盐含量。针对F−所致的人类健康风险,其针对性措施可以集中在减少部分工业生产,为了控制过量氟对人体健康的危害,要严格把控氟的排放量等,从而保障研究区居民的健康安全。
(1)研究区地下水整体呈弱碱性,TDS变化范围较大,为274~11 024 mg/L。阳离子的离子优势模式为Na+>Mg2+>Ca2+>K+,阴离子的离子优势模式为HCO3−>SO42−>Cl−>NO3−。研究区主要的地下水类型为Na-Cl-SO4和Na-Ca-HCO3类型。水化学组成以白云石溶解和离子交换过程为主。NO3−污染主要归因于工业活动。
(2)根据熵权水质指数(EWQI)评价体系,地下水样品中适宜饮用的占92.11%,不适宜饮用的仅占7.89%。水质差、极差样品主要分布在研究区的中南部,今后应重点关注该区域的地下水环境监管与保护。
(3)非致癌风险评估结果显示,健康风险指数(HI)值及空间分布顺序为儿童>成年女性>成年男性。健康风险评估明显发现,研究地区的儿童和成年女性在摄入F−和NO3−污染物的情况下比成年男性更容易遭受健康风险。

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2026年第59卷第4期
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doi: 10.12401/j.nwg.2025113
  • 接收时间:2024-05-25
  • 首发时间:2026-09-16
  • 出版时间:2026-08-20
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  • 收稿日期:2024-05-25
  • 修回日期:2025-08-25
  • 录用日期:2025-08-28
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    1中陕核工业集团综合分析测试有限公司,陕西 西安 710038
    2四川省自然资源实验测试研究中心,四川 成都 610000
    3中国地质调查局西安矿产资源调查中心,陕西 西安 710000
    4西南交通大学地球科学与工程学院,四川 成都 611756

通讯作者:

张云辉(1990−),男,副教授,博士,主要从事水文地质与环境地质教学科研工作。E−mail:。
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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