Scholarlink

<p>Geochemical analysis of Potentially Toxic Elements (PTEs) in stream sediments is essential for understanding environmental impacts in areas with complex geology and mining activities. This study focuses on stream sediments from the eastern sector of the Mt. Amiata Hg-district (central Italy) to define the background values of As, Sb, Cr, V, Co, Cu, Ni, and Hg, the latter being speciated to assess its bioavailability and mobility for potential environmental risks. The stream sediments are divided into four different groups: (1) Volcanic, (2) Volcanic-dominated, (3) Sedimentary-dominated, and (4) Sedimentary. This subdivision is confirmed by spatial distribution maps. While Cr, Co, V, Cu, and Ni are related to mafic and ultramafic rocks, Hg shows higher concentrations (up to 850&#xa0;mg/kg) close to the former mining sites and organic-rich areas. In streams draining the Mt. Amiata volcanics and hydrothermal zones, As is up to 311&#xa0;mg/kg while Sb is uniformly distributed (up to 84&#xa0;mg/kg), though depleted in volcanic rocks. Consolidated sediment clusters (group 1 and group 2 and group 3 and group 4, respectively) are used to calculate the geochemical background values (crucial for post-extractive land reclamation), which result to overcome the concentrations imposed by the Italian law for Hg in both clusters, As in cluster 1 and Co in cluster 2 (5.2–6.3, 20–24.3, 39.7–48.5, and 26.3–32.2&#xa0;mg/kg, respectively). In the stream sediments, Hg speciation by thermal desorption highlights the presence of stable Hg forms. Thus, low Hg bioavailability is expected, being also consistent with the soils from the nearby mining areas.</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

Provenance and distribution of potentially toxic elements (PTEs) in stream sediments from the eastern Hg-district of Mt. Amiata (central Italy)

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月20日

查看全文
  • Federica Meloni,
  • Enrico Dinelli,
  • Jacopo Cabassi,
  • Barbara Nisi,
  • Giordano Montegrossi,
  • Daniele Rappuoli,
  • Orlando Vaselli

摘要

Geochemical analysis of Potentially Toxic Elements (PTEs) in stream sediments is essential for understanding environmental impacts in areas with complex geology and mining activities. This study focuses on stream sediments from the eastern sector of the Mt. Amiata Hg-district (central Italy) to define the background values of As, Sb, Cr, V, Co, Cu, Ni, and Hg, the latter being speciated to assess its bioavailability and mobility for potential environmental risks. The stream sediments are divided into four different groups: (1) Volcanic, (2) Volcanic-dominated, (3) Sedimentary-dominated, and (4) Sedimentary. This subdivision is confirmed by spatial distribution maps. While Cr, Co, V, Cu, and Ni are related to mafic and ultramafic rocks, Hg shows higher concentrations (up to 850 mg/kg) close to the former mining sites and organic-rich areas. In streams draining the Mt. Amiata volcanics and hydrothermal zones, As is up to 311 mg/kg while Sb is uniformly distributed (up to 84 mg/kg), though depleted in volcanic rocks. Consolidated sediment clusters (group 1 and group 2 and group 3 and group 4, respectively) are used to calculate the geochemical background values (crucial for post-extractive land reclamation), which result to overcome the concentrations imposed by the Italian law for Hg in both clusters, As in cluster 1 and Co in cluster 2 (5.2–6.3, 20–24.3, 39.7–48.5, and 26.3–32.2 mg/kg, respectively). In the stream sediments, Hg speciation by thermal desorption highlights the presence of stable Hg forms. Thus, low Hg bioavailability is expected, being also consistent with the soils from the nearby mining areas.