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<p>The exploitation of lead in Bouaazza’s mine (NE Morocco) caused sulfuric discharges to be exposed in big superficies, which generated pollution of sediments in the area by acid mine drainage. The results of physicochemical properties (pH and electrical conductivity) and heavy metals concentrations indicated an acidic pH (&lt; 6) for sediments, especially for samples stations near Bouaazza’s mine. As for heavy metals, the X-ray fluorescence concentrations for Zn, Pb, Cu, Ni and Cr were high, with concentrations exceeding international standards. The index of geo-accumulation showed a high level of heavy metals toxicity present in the sediments in and near the mining area, with geo-accumulation index concentrations higher than 5. The concentrations found in the health risk assessment for noncarcinogenic risks of Pb and As for adults and children indicated the probability of potential noncarcinogenic effects in the area, with concentrations higher than 1 in most of the samples stations. In addition, the carcinogenic risk of As in most of the samples exceeded 10<sup>–4</sup>; this could generate a potential carcinogenic threat to the human health of Dar Bouaazza’s population.</p>

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Heavy metal pollution risks in Makhat’s Watershed Sediments (Taza Province, Morocco): ecological and health risks

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Ikram Lahmidi,
  • Narmine Assabar,
  • Laila Mesrar,
  • Marouane Laaraj,
  • Youssef Drissi,
  • Haytam Tribak,
  • Raouf Jabrane

摘要

The exploitation of lead in Bouaazza’s mine (NE Morocco) caused sulfuric discharges to be exposed in big superficies, which generated pollution of sediments in the area by acid mine drainage. The results of physicochemical properties (pH and electrical conductivity) and heavy metals concentrations indicated an acidic pH (< 6) for sediments, especially for samples stations near Bouaazza’s mine. As for heavy metals, the X-ray fluorescence concentrations for Zn, Pb, Cu, Ni and Cr were high, with concentrations exceeding international standards. The index of geo-accumulation showed a high level of heavy metals toxicity present in the sediments in and near the mining area, with geo-accumulation index concentrations higher than 5. The concentrations found in the health risk assessment for noncarcinogenic risks of Pb and As for adults and children indicated the probability of potential noncarcinogenic effects in the area, with concentrations higher than 1 in most of the samples stations. In addition, the carcinogenic risk of As in most of the samples exceeded 10–4; this could generate a potential carcinogenic threat to the human health of Dar Bouaazza’s population.