Scholarlink

<p>The Pilcomayo is a transboundary Andean-to-Chaco sediment-choked basin, where mining in the upper basin has a history of over 500&#xa0;years. The river margins are home to many communities, primarily indigenous, who rely on the main fish resource, sábalo <i>Prochilodus lineatus</i>. High levels of metal(oid)s in the upper basin’s water and sediments have sparked diplomatic and local debates about the state of resources in the lower area, which could be impacted by downstream contaminant transport. This study evaluates the concentrations of As, Cd, Cr, Cu, Hg, Li, Ni, Pb, and Zn in water and sediment at seven sampling stations during dry and wet seasons, as well as in sábalo from two sites in the lower Pilcomayo Basin (Argentina and Bolivia). These locations were compared with reference sites in the Pilcomayo and Bermejo basins that were not impacted by mining. A decrease in As, Cu, Hg, Pb, and Zn levels in water and sediments towards the lower basin was observed. Enrichment of As, Cd, Pb (up to 2.3), and Hg (2.5 to 10) was found in sediments of the lower Pilcomayo compared to regional unimpacted background, suggesting that mining activities may have a significant impact. In fish muscle, Hg (&lt; 0.77&#xa0;mg/kg) was enriched 4 times compared to the Paraná River (Argentina). Metal concentrations in fish were all below WHO recommended guidelines. The estimated daily intake and target hazard quotient (&lt; 1) suggest no significant risk to adults or children from chronic consumption of a fish-rich diet in local populations.</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

Transboundary mining pollution? Metal(oid) concentrations in water, sediments, and risk assessment for fish consumption in a lower Andean-to-Chaco sediment-choked basin

  • 期刊论文

  • 发表日期：

    2025年5月1日

查看全文
  • Esteban Avigliano,
  • Eléonore Resongles,
  • Enzo Moreno,
  • Mylène Marie,
  • Marco Jaldín,
  • Marc Pouilly

摘要

The Pilcomayo is a transboundary Andean-to-Chaco sediment-choked basin, where mining in the upper basin has a history of over 500 years. The river margins are home to many communities, primarily indigenous, who rely on the main fish resource, sábalo Prochilodus lineatus. High levels of metal(oid)s in the upper basin’s water and sediments have sparked diplomatic and local debates about the state of resources in the lower area, which could be impacted by downstream contaminant transport. This study evaluates the concentrations of As, Cd, Cr, Cu, Hg, Li, Ni, Pb, and Zn in water and sediment at seven sampling stations during dry and wet seasons, as well as in sábalo from two sites in the lower Pilcomayo Basin (Argentina and Bolivia). These locations were compared with reference sites in the Pilcomayo and Bermejo basins that were not impacted by mining. A decrease in As, Cu, Hg, Pb, and Zn levels in water and sediments towards the lower basin was observed. Enrichment of As, Cd, Pb (up to 2.3), and Hg (2.5 to 10) was found in sediments of the lower Pilcomayo compared to regional unimpacted background, suggesting that mining activities may have a significant impact. In fish muscle, Hg (< 0.77 mg/kg) was enriched 4 times compared to the Paraná River (Argentina). Metal concentrations in fish were all below WHO recommended guidelines. The estimated daily intake and target hazard quotient (< 1) suggest no significant risk to adults or children from chronic consumption of a fish-rich diet in local populations.