Groundwater in Southern Vietnam: Understanding geochemical processes to better preserve the critical water resource

A thorough understanding of groundwater geochemical characteristics and dominant hydro(bio)geochemical processes in the aquifers is valuable for sustainable groundwater protection. With this respect, this study provides a comprehensive assessment of hydrogeochemical characteristics of groundwater in...

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Veröffentlicht in:The Science of the total environment 2022-02, Vol.807 (Pt 2), p.151345-151345, Article 151345
Hauptverfasser: Ha, Quang Khai, Tran Ngoc, Tien Dung, Le Vo, Phu, Nguyen, Hong Quan, Dang, Duc Huy
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container_issue Pt 2
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container_title The Science of the total environment
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creator Ha, Quang Khai
Tran Ngoc, Tien Dung
Le Vo, Phu
Nguyen, Hong Quan
Dang, Duc Huy
description A thorough understanding of groundwater geochemical characteristics and dominant hydro(bio)geochemical processes in the aquifers is valuable for sustainable groundwater protection. With this respect, this study provides a comprehensive assessment of hydrogeochemical characteristics of groundwater in sedimentary aquifers of the Southern region of Vietnam. The dataset comprised 291 water samples collected in rainy and dry seasons from 155 wells, and their chemical compositions of dissolved ions (Ca2+, Mg2+, Na+, K+, HCO3−, Cl−, SO42−, NO3−, NH4+, Fe, total dissolved solids) and pH. We calculated the groundwater quality index to determine the suitability of groundwater for drinking purposes. Accordingly, about 47% of groundwater samples range from poor to unsuitable quality for drinking purposes, in which total dissolved solid (TDS) and high iron concentrations are primary factors. We also examined hydrogeochemical characteristics by multivariate statistical analyses (Hierarchical Cluster Analysis and Principal Component Analysis). The results demonstrated four groups of water: fresh groundwater (TDS 
doi_str_mv 10.1016/j.scitotenv.2021.151345
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With this respect, this study provides a comprehensive assessment of hydrogeochemical characteristics of groundwater in sedimentary aquifers of the Southern region of Vietnam. The dataset comprised 291 water samples collected in rainy and dry seasons from 155 wells, and their chemical compositions of dissolved ions (Ca2+, Mg2+, Na+, K+, HCO3−, Cl−, SO42−, NO3−, NH4+, Fe, total dissolved solids) and pH. We calculated the groundwater quality index to determine the suitability of groundwater for drinking purposes. Accordingly, about 47% of groundwater samples range from poor to unsuitable quality for drinking purposes, in which total dissolved solid (TDS) and high iron concentrations are primary factors. We also examined hydrogeochemical characteristics by multivariate statistical analyses (Hierarchical Cluster Analysis and Principal Component Analysis). The results demonstrated four groups of water: fresh groundwater (TDS &lt; 1 g/L) in the highland (Group 1), lowland fresh-to-saline groundwater (2a), lowland saline groundwater (2b), and lowland saline/acidic groundwater (2c). Although the highland area is currently not impacted by salinization, the contamination by nitrate and chloride associated with a dense urban population and agricultural practices is deteriorating its fresh groundwater resources. On the other hand, the lowland area of Southern Vietnam is highly vulnerable to seawater intrusion (groups 2b and 2c). Only 34% out of 191 samples collected in the lowland area of southern Vietnam remained fresh. In this light, this study depicted the specific geographical location for various groundwater groups in Southern Vietnam. This finding is significant to assist water scientists and decision-makers in implementing targetted groundwater management measures as prevention and protection strategies should be tailored to groundwater geochemical characteristics and the dominant hydro(bio)geochemical processes. [Display omitted] •Groundwater salinization and contamination are widely observed in Southern Vietnam.•Multivariate statistical is a useful tool for assessment of groundwater geochemistry.•Groundwater in a highland area is susceptible to anthropogenic activities.•Groundwater in a lowland area is vulnerable to seawater intrusion and acidification.•Understanding groundwater geochemistry is crucial for sustainable groundwater management.</description><identifier>ISSN: 0048-9697</identifier><identifier>EISSN: 1879-1026</identifier><identifier>DOI: 10.1016/j.scitotenv.2021.151345</identifier><identifier>PMID: 34748845</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Acidification ; Anthropogenic activities ; Groundwater ; Groundwater geochemistry ; Multivariate analyses ; Rain ; Saltwater intrusion ; Southern Vietnam ; Vietnam ; Water Resources ; Water Wells</subject><ispartof>The Science of the total environment, 2022-02, Vol.807 (Pt 2), p.151345-151345, Article 151345</ispartof><rights>2021 Elsevier B.V.</rights><rights>Copyright © 2021 Elsevier B.V. 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The results demonstrated four groups of water: fresh groundwater (TDS &lt; 1 g/L) in the highland (Group 1), lowland fresh-to-saline groundwater (2a), lowland saline groundwater (2b), and lowland saline/acidic groundwater (2c). Although the highland area is currently not impacted by salinization, the contamination by nitrate and chloride associated with a dense urban population and agricultural practices is deteriorating its fresh groundwater resources. On the other hand, the lowland area of Southern Vietnam is highly vulnerable to seawater intrusion (groups 2b and 2c). Only 34% out of 191 samples collected in the lowland area of southern Vietnam remained fresh. In this light, this study depicted the specific geographical location for various groundwater groups in Southern Vietnam. This finding is significant to assist water scientists and decision-makers in implementing targetted groundwater management measures as prevention and protection strategies should be tailored to groundwater geochemical characteristics and the dominant hydro(bio)geochemical processes. [Display omitted] •Groundwater salinization and contamination are widely observed in Southern Vietnam.•Multivariate statistical is a useful tool for assessment of groundwater geochemistry.•Groundwater in a highland area is susceptible to anthropogenic activities.•Groundwater in a lowland area is vulnerable to seawater intrusion and acidification.•Understanding groundwater geochemistry is crucial for sustainable groundwater management.</description><subject>Acidification</subject><subject>Anthropogenic activities</subject><subject>Groundwater</subject><subject>Groundwater geochemistry</subject><subject>Multivariate analyses</subject><subject>Rain</subject><subject>Saltwater intrusion</subject><subject>Southern Vietnam</subject><subject>Vietnam</subject><subject>Water Resources</subject><subject>Water Wells</subject><issn>0048-9697</issn><issn>1879-1026</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkE1vGyEQhlHVqHaS_oWWYy_rAgvL0psVpUklSznk44pYdjbB8oILrKP---Js6mvnwmHeeWZ4EPpKyYoS2nzfrpJ1OWTwhxUjjK6ooDUXH9CStlJVlLDmI1oSwttKNUou0HlKW1JKtvQTWtRc8rblYonSTQyT719Nhoidx_dhyi8QPX5ykL0Zf-BH30NM2fje-Wf8DMG-wOis2eF9DBZSgoRzwB3kI2IfIUE8AC4UbKPLb8kZX1phihYu0dlgdgk-v78X6PHn9cPVbbW5u_l1td5UtpY0VzAYqFtFZEdaaTvJRTeA4JI1jTV1DcJ0SlDFmOKcKQGD5ZzQrlOGsqFlsr5A32ZuOfT3BCnr0SULu53xEKakmVBCiLoAS1TOURtDShEGvY9uNPGPpkQfjeutPhnXR-N6Nl4mv7wvmboR-tPcP8UlsJ4DUL56cBCPIPAWehfBZt0H998lfwGIQZj9</recordid><startdate>20220210</startdate><enddate>20220210</enddate><creator>Ha, Quang Khai</creator><creator>Tran Ngoc, Tien Dung</creator><creator>Le Vo, Phu</creator><creator>Nguyen, Hong Quan</creator><creator>Dang, Duc Huy</creator><general>Elsevier B.V</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20220210</creationdate><title>Groundwater in Southern Vietnam: Understanding geochemical processes to better preserve the critical water resource</title><author>Ha, Quang Khai ; Tran Ngoc, Tien Dung ; Le Vo, Phu ; Nguyen, Hong Quan ; Dang, Duc Huy</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c371t-efae38907b087cb745bfe547266ca33e5ab951922944295efc4401bb9a12f8273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Acidification</topic><topic>Anthropogenic activities</topic><topic>Groundwater</topic><topic>Groundwater geochemistry</topic><topic>Multivariate analyses</topic><topic>Rain</topic><topic>Saltwater intrusion</topic><topic>Southern Vietnam</topic><topic>Vietnam</topic><topic>Water Resources</topic><topic>Water Wells</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ha, Quang Khai</creatorcontrib><creatorcontrib>Tran Ngoc, Tien Dung</creatorcontrib><creatorcontrib>Le Vo, Phu</creatorcontrib><creatorcontrib>Nguyen, Hong Quan</creatorcontrib><creatorcontrib>Dang, Duc Huy</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>The Science of the total environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ha, Quang Khai</au><au>Tran Ngoc, Tien Dung</au><au>Le Vo, Phu</au><au>Nguyen, Hong Quan</au><au>Dang, Duc Huy</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Groundwater in Southern Vietnam: Understanding geochemical processes to better preserve the critical water resource</atitle><jtitle>The Science of the total environment</jtitle><addtitle>Sci Total Environ</addtitle><date>2022-02-10</date><risdate>2022</risdate><volume>807</volume><issue>Pt 2</issue><spage>151345</spage><epage>151345</epage><pages>151345-151345</pages><artnum>151345</artnum><issn>0048-9697</issn><eissn>1879-1026</eissn><abstract>A thorough understanding of groundwater geochemical characteristics and dominant hydro(bio)geochemical processes in the aquifers is valuable for sustainable groundwater protection. With this respect, this study provides a comprehensive assessment of hydrogeochemical characteristics of groundwater in sedimentary aquifers of the Southern region of Vietnam. The dataset comprised 291 water samples collected in rainy and dry seasons from 155 wells, and their chemical compositions of dissolved ions (Ca2+, Mg2+, Na+, K+, HCO3−, Cl−, SO42−, NO3−, NH4+, Fe, total dissolved solids) and pH. We calculated the groundwater quality index to determine the suitability of groundwater for drinking purposes. Accordingly, about 47% of groundwater samples range from poor to unsuitable quality for drinking purposes, in which total dissolved solid (TDS) and high iron concentrations are primary factors. We also examined hydrogeochemical characteristics by multivariate statistical analyses (Hierarchical Cluster Analysis and Principal Component Analysis). The results demonstrated four groups of water: fresh groundwater (TDS &lt; 1 g/L) in the highland (Group 1), lowland fresh-to-saline groundwater (2a), lowland saline groundwater (2b), and lowland saline/acidic groundwater (2c). Although the highland area is currently not impacted by salinization, the contamination by nitrate and chloride associated with a dense urban population and agricultural practices is deteriorating its fresh groundwater resources. On the other hand, the lowland area of Southern Vietnam is highly vulnerable to seawater intrusion (groups 2b and 2c). Only 34% out of 191 samples collected in the lowland area of southern Vietnam remained fresh. In this light, this study depicted the specific geographical location for various groundwater groups in Southern Vietnam. This finding is significant to assist water scientists and decision-makers in implementing targetted groundwater management measures as prevention and protection strategies should be tailored to groundwater geochemical characteristics and the dominant hydro(bio)geochemical processes. [Display omitted] •Groundwater salinization and contamination are widely observed in Southern Vietnam.•Multivariate statistical is a useful tool for assessment of groundwater geochemistry.•Groundwater in a highland area is susceptible to anthropogenic activities.•Groundwater in a lowland area is vulnerable to seawater intrusion and acidification.•Understanding groundwater geochemistry is crucial for sustainable groundwater management.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>34748845</pmid><doi>10.1016/j.scitotenv.2021.151345</doi><tpages>1</tpages></addata></record>
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subjects Acidification
Anthropogenic activities
Groundwater
Groundwater geochemistry
Multivariate analyses
Rain
Saltwater intrusion
Southern Vietnam
Vietnam
Water Resources
Water Wells
title Groundwater in Southern Vietnam: Understanding geochemical processes to better preserve the critical water resource
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