学術雑誌論文

学術雑誌論文

text

Environmental Science and Pollution Research. 2023, 30, p. 122024-122037

Scaling effects on arsenic release from excavated hydrothermally altered rocks in column experiments

Springer Science and Business Media LLC

英語

text

2023-11-15

https://doi.org/10.1007/s11356-023-30594-6

The version of record of this article, first published in Environmental Science and Pollution Research, is available online at Publisher’s website: https://doi.org/10.1007/s11356-023-30594-6

The excavation of hydrothermally altered rocks from construction sites in Japan has raised concerns over environmental pollution due to the arsenic (As) release beyond the regulatory limit. An accurate assessment of As leaching from these rocks is imperative to understanding potential environmental implications and formulating efficient containment measures. However, the conduction of column leaching experiments to evaluate As leaching from these rocks encounters a lack of well-established protocols primarily due to the ambiguity surrounding scaling effects resulting from alterations in particle sizes and the corresponding column dimensions. Our study aimed to address this critical issue by conducting column percolation experiments on hydrothermally altered rocks of two distinct particle size ranges and rock layer thicknesses. The pH value was found to be proportional to the specific surface area (SSA) of rocks and the rock layer thickness in terms of H+ concentrations. Furthermore, the concentration and leachability of As showed a similar proportionality with the SSA. In contrast, the concentration of As remained relatively unaffected by the increased rock layer thickness, while the leachability of As was noticeably diminished in the column with a thicker rock layer. The absence of elevated As concentration and the decrease in leachability can be attributed to the enhanced As onto Fe/Al oxyhydroxides/oxides within the half-bottom part of the column with a thicker rock layer. Our findings underscore the importance of considering the SSA of rocks and rock layer thickness in the column experiments and help in the design of effective strategies to mitigate environmental contamination.

This article is licensed under a Creative Commons Attribution 4.0 International License.

93300

Scaling effects on arsenic release from excavated hydrothermally altered rocks in column experiments

Springer Science and Business Media LLC

英語

2023-11-15

Environmental Science and Pollution Research

30

122024

122037

https://doi.org/10.1007/s11356-023-30594-6

https://hdl.handle.net/11094/93300