Scholarlink

<p>Consumption of As-rich and saline groundwater can pose significant human health risks for millions of people in coastal areas. This study focuses on the co-contamination of trace metal and salinization in groundwater of An Giang Province, an As hotspot in the Mekong Delta. Fifty-five private well samples were analyzed using the Heavy Metal Pollution Index (HPI), health risk assessment, and multivariate statistics (PCA, HCA) to identify geochemical controls. Drinking water standards were exceeded in 62% (Mn), 45% (Na), 33% (Cl, Fe), 29% (TDS), 18% (As), 9% (Cd), and 11% (NO₃⁻) of samples; 75% were contaminated by at least one parameter. HPI ratings classified 38% of samples as moderate to heavy or heavy pollution. Health risk assessments revealed that 18% of the samples for adults and 33% for children had Hazard Quotients (HQ) &gt; 1. About 29% and 40% of total samples show Carcinogenic Risk (CR) values for adult and children greater than 1 × 10⁻⁴, respectively indicating that local populations are at higher risk of developing cancer. Depth-specific patterns revealed that As and Fe mobilization is concentrated in shallow aquifers (&lt; 35&#xa0;m) under reducing conditions, Mn and Cd enrichment occurs in intermediate aquifers (35–100&#xa0;m) influenced by salinization, and deep aquifers (&gt; 100&#xa0;m) remain comparatively uncontaminated. PCA and HCA identified three dominant geochemical processes: (i) salinization and ion exchange, (ii) reductive dissolution of Fe-oxyhydroxides mobilizing As and Fe, and (iii) silicate/carbonate weathering. These findings highlight the importance of aquifer stratigraphy in governing groundwater vulnerability and underscore the need for targeted management strategies to safeguard water quality in the arsenic-affected coastal regions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Arsenic, trace metals, and salinity co-contamination in groundwater of an Giang, Mekong delta: health risks and geochemical drivers

  • 期刊论文

  • 发表日期：

    2025年10月15日

查看全文
  • Quang Khai Ha,
  • Van Tuc Dang,
  • Tran Ba Loc,
  • Dan Thanh Vo,
  • Le Phu Vo

摘要

Consumption of As-rich and saline groundwater can pose significant human health risks for millions of people in coastal areas. This study focuses on the co-contamination of trace metal and salinization in groundwater of An Giang Province, an As hotspot in the Mekong Delta. Fifty-five private well samples were analyzed using the Heavy Metal Pollution Index (HPI), health risk assessment, and multivariate statistics (PCA, HCA) to identify geochemical controls. Drinking water standards were exceeded in 62% (Mn), 45% (Na), 33% (Cl, Fe), 29% (TDS), 18% (As), 9% (Cd), and 11% (NO₃⁻) of samples; 75% were contaminated by at least one parameter. HPI ratings classified 38% of samples as moderate to heavy or heavy pollution. Health risk assessments revealed that 18% of the samples for adults and 33% for children had Hazard Quotients (HQ) > 1. About 29% and 40% of total samples show Carcinogenic Risk (CR) values for adult and children greater than 1 × 10⁻⁴, respectively indicating that local populations are at higher risk of developing cancer. Depth-specific patterns revealed that As and Fe mobilization is concentrated in shallow aquifers (< 35 m) under reducing conditions, Mn and Cd enrichment occurs in intermediate aquifers (35–100 m) influenced by salinization, and deep aquifers (> 100 m) remain comparatively uncontaminated. PCA and HCA identified three dominant geochemical processes: (i) salinization and ion exchange, (ii) reductive dissolution of Fe-oxyhydroxides mobilizing As and Fe, and (iii) silicate/carbonate weathering. These findings highlight the importance of aquifer stratigraphy in governing groundwater vulnerability and underscore the need for targeted management strategies to safeguard water quality in the arsenic-affected coastal regions.