Eluted components from drifted pumice –A case study of pumice ejected from Fukutoku Okanoba in 2021

DOI

Bibliographic Information

Other Title
  • 漂着軽石の溶出成分について ― 2021 年福徳岡ノ場から噴出した軽石の事例
Published
2025
DOI
  • 10.11162/daikankyo.24h1201
Publisher
Academic Consociation of Environmental Safety and Waste Management, Japan

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Description

<p>A significant quantity of pumice released from the Fukutoku Okanoba submarine volcano on the Ogasawara Islands, Tokyo, Japan, in August 2021, drifted to various coasts of Japan by 2023. This study analyzed the surface constituents of pumice that washed ashore the Tokunoshima Island, Kagoshima Prefecture, and the components eluted after the pumice was immersed and shaken in water. Results indicated that SiO 2 was the most abundant component on the pumice surface, followed by Al 2O 3 and Fe 2O 3. When the pumice was immersed and shaken in water for three months, fine particles precipitated, resulting in approximately 10% reduction in pumice weight. The amount of anionic and metallic components from the pumice was monitored from day 1 to day 49. It was observed that over 70% of seawater-derived components (Cl – , Br – , NO 3– , SO 4 2– , Na, Mg, and Ca) adhering to the pumice were released into fresh water within 1–3 days. The immersion and agitation process also scraped the pumice surface, releasing Al and Fe, the primary metallic constituents of pumice, either as dissolved species or fine precipitates. Importantly, the study confirmed the absence of toxic heavy metals, including Cd, Cr, and Pb, in the eluted pumice, indicating that these hazardous elements were neither present nor leached out.</p>

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Details 詳細情報について

  • CRID
    1390867919041637632
  • DOI
    10.11162/daikankyo.24h1201
  • ISSN
    21863725
    18844375
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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