Experimental Study on Dissolution Behaviors of Arsenic and Metals from Rocks and Soils in Hydrothermal Alteration Area

HAMAI Takaya, TSUCHIYA Noriyoshi, YAMADA Ryoichi, OGAWA Yasumasa

doi:10.2473/journalofmmij.131.56

In hydrothermal alteration area, arsenic and metals included in rocks can be expected to leach out from the outcrops. In order to perform risk assessments of leaching arsenic and metals, it is important to systematically understand the leaching behavior of arsenic and metals from rocks and soils. In this study, the geochemical behavior of arsenic and metals, which were leached out from rocks in a hydrothermal alteration area, was investigated. Monolith of outcrop was classified into layer A (weathered rocks), layer B (intermediate), and layer C (host rocks) based on soil classification, and then extraction experiments of arsenic and metals for individual layer were conducted. The results showed that in the hydrothermal alteration zone, arsenic and metals readily leached into the water from the rocks of layer C as ionic forms, while arsenic and metals from the rocks of layer A were relatively stable. That is, the leaching concentrations were lower, and leached arsenic and metals were colloidal. In addition, the arsenic leaching from the layer C into the water increased at a lower temperature. By considering the chemical forms of arsenic and metals and their geochemical behaviors under several environmental conditions, we can evaluate the risks of natural arsenic and metals and apply such knowledge to the treatment procedures.

Experimental Study on Dissolution Behaviors of Arsenic and Metals from Rocks and Soils in Hydrothermal Alteration Area

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