{"title":"Groundwater quality and hydrogeochemical challenges in the Sarakhs Plain, NE Iran: a call for sustainable management.","authors":"Maryam Tajbakhshian","doi":"10.1007/s10653-025-02371-6","DOIUrl":null,"url":null,"abstract":"<p><p>The physicochemical analysis of 292 groundwater samples from the Sarakhs Plain revealed significant variations in water quality, influenced by natural factors. The pH values ranged from 6.4 to 8.6, with an average of 7.97, indicating that most of the samples (98.97%) meet WHO drinking water standards. However, electrical conductivity (EC) levels were alarmingly high, ranging from 1020 to 37,500 μS cm<sup>-1</sup>, making all samples unsuitable for drinking. Ca<sup>2+</sup> and Mg<sup>2+</sup> concentrations were within acceptable limits for approximately 88.39% and 61.09% of the samples, respectively. Spatial distribution analysis showed that higher salinity levels were concentrated in the western and central regions, while the eastern areas benefited from fresher water due to the influence of the Harirud River, which enhances groundwater quality through natural dilution processes. Hydrogeochemical assessments indicated a predominance of mixed-type water, with significant intrusion processes affecting chemical composition. The Gibbs diagram highlighted evaporation as a major factor influencing water chemistry. Groundwater quality index (GWQI) indicated that nearly half of the samples were classified as unsuitable for drinking, while agricultural suitability varied significantly. Although salinity was a critical concern, many samples were deemed suitable for irrigation based on specific ion concentrations. Overall, this study addressed the necessity for sustainable groundwater management practices in the Sarakhs Plain to mitigate salinity issues and enhance water quality for both human consumption and agricultural use.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"47 3","pages":"75"},"PeriodicalIF":3.8000,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Geochemistry and Health","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s10653-025-02371-6","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
The physicochemical analysis of 292 groundwater samples from the Sarakhs Plain revealed significant variations in water quality, influenced by natural factors. The pH values ranged from 6.4 to 8.6, with an average of 7.97, indicating that most of the samples (98.97%) meet WHO drinking water standards. However, electrical conductivity (EC) levels were alarmingly high, ranging from 1020 to 37,500 μS cm-1, making all samples unsuitable for drinking. Ca2+ and Mg2+ concentrations were within acceptable limits for approximately 88.39% and 61.09% of the samples, respectively. Spatial distribution analysis showed that higher salinity levels were concentrated in the western and central regions, while the eastern areas benefited from fresher water due to the influence of the Harirud River, which enhances groundwater quality through natural dilution processes. Hydrogeochemical assessments indicated a predominance of mixed-type water, with significant intrusion processes affecting chemical composition. The Gibbs diagram highlighted evaporation as a major factor influencing water chemistry. Groundwater quality index (GWQI) indicated that nearly half of the samples were classified as unsuitable for drinking, while agricultural suitability varied significantly. Although salinity was a critical concern, many samples were deemed suitable for irrigation based on specific ion concentrations. Overall, this study addressed the necessity for sustainable groundwater management practices in the Sarakhs Plain to mitigate salinity issues and enhance water quality for both human consumption and agricultural use.
期刊介绍：
Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people.
Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes.
The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
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