Short and long term release mechanisms of arsenic, selenium and boron from a tunnel-excavated sedimentary rock under in situ conditions

Journal of Contaminant Hydrology
Shuichi TamotoNaoki Hiroyoshi

Abstract

Sedimentary rocks of marine origin excavated from tunnel construction projects usually contain background levels of hazardous trace elements, but when exposed to the environment, they generate leachates with concentrations of arsenic (As), selenium (Se) and boron (B) exceeding the WHO guideline for drinking water. In this study, the leaching of As, Se and B was evaluated under in situ conditions at various flow patterns, particle size distributions and column thicknesses. The results showed that these trace elements were leached out of the rock via short and long term mechanisms. In the short term, all three elements were rapidly and simultaneously released due to the dissolution of soluble evaporite salts formed from entrapped sea water of the Cretaceous. After their rapid release, however, these trace elements behaved differently as a result of their contrasting adsorption affinities onto minerals like clays and Fe-oxyhydroxides, which were further influenced by the pH, presence of coexisting ions and speciation of the trace elements. Selenium was quickly and easily transported out of the columns because it was mostly present as the very mobile selenate ion (Se[VI]). In comparison, the migration of As and B was hindered by ad...Continue Reading

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Citations

Jan 7, 2017·The Science of the Total Environment·Carlito Baltazar TabelinToshifumi Igarashi
Dec 19, 2016·The Science of the Total Environment·Carlito Baltazar TabelinToshifumi Igarashi
Jul 14, 2019·Environmental Geochemistry and Health·Shoji Suzuki, Masahiko Katoh
Aug 16, 2019·The Science of the Total Environment·Kyriaki KalaitzidouManassis Mitrakas
Jul 13, 2021·Journal of Hazardous Materials·Zhiyuan NieJinbao Liu
Nov 23, 2021·The Science of the Total Environment· Monika MahajanRajeev Pratap Singh

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