Relationship between arsenic phases and leaching in excavated mudstone after removal of leachable fraction

Shoji Suzuki, Masahiko Kato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Huge amount of excavated rock is generated in tunnel construction for roads and railways. The excavated rock contains toxic trace metals and/or metalloids at the same level or slightly higher than background level. Our previous studies showed that in the column leaching test, the amount of arsenic leached from the excavated rock till the arsenic concentration was steadily below 0.01 mg/L was comparable with the amount of the first two arsenic fractions in the sequential extraction. In this study, the leachable arsenic fraction was removed from the excavated rock (mudstone) sample in order to obtain the excavated rock sample which artificially undergoes the leaching process. The column leaching test using the leachable-arsenic-arsenic-fraction-removed sample shows the behavior of arsenic leaching was different depending on the samples. They decreased from 66% to 31% of summed amounts of F1 and F2 arsenic fraction in the sequential extraction, respectively.

Original languageEnglish
Title of host publicationProceedings of the 8th International Congress on Environmental Geotechnics Volume 1 - Towards a Sustainable Geoenvironment
EditorsAbdelmalek Bouazza, Liangtong Zhan, Yunmin Chen
PublisherSpringer Berlin Heidelberg
Pages676-682
Number of pages7
ISBN (Print)9789811322204
DOIs
Publication statusPublished - 1 Jan 2019
Event8th International Congress on Environmental Geotechnics, ICEG 2018 - Hangzhou, China
Duration: 28 Oct 20181 Nov 2018

Publication series

NameEnvironmental Science and Engineering
ISSN (Print)1863-5520
ISSN (Electronic)1863-5539

Conference

Conference8th International Congress on Environmental Geotechnics, ICEG 2018
CountryChina
CityHangzhou
Period28/10/181/11/18

Keywords

  • Arsenic leaching
  • Column test
  • Excavated rock
  • Leaching behavior

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  • Cite this

    Suzuki, S., & Kato, M. (2019). Relationship between arsenic phases and leaching in excavated mudstone after removal of leachable fraction. In A. Bouazza, L. Zhan, & Y. Chen (Eds.), Proceedings of the 8th International Congress on Environmental Geotechnics Volume 1 - Towards a Sustainable Geoenvironment (pp. 676-682). (Environmental Science and Engineering). Springer Berlin Heidelberg. https://doi.org/10.1007/978-981-13-2221-1_75