Transient behavior of arsenic in vadose zone under alternating wet and dry conditions: A comparative soil column study

Tho Huu Huynh Tran, Sang Hyun Kim, Ho Young Jo, Jaeshik Chung, Seunghak Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The water and oxygen contents of the vadose zone change cyclically depending upon the meteorological condition (e.g., intermittent rainfall), which can affect the biogeochemical reactions that govern the fate of arsenic (As). To simulate and evaluate the transient behavior of As in this zone when subjected to repeated wet and dry conditions, soil column experiments with different soil properties were conducted. Three wetting–drying cycles resulted in the fluctuation of water and dissolved oxygen contents, and consequently, the reduction–oxidation potential in the soil columns. Under these circumstances, the biotic reduction of As(V) to As(III) was observed, especially in the column filled with soils enriched in organic matter. Most of the As was found to be associated with soil particles rather than to be dissolved in the pore water in all of the columns tested. Retention of As was more preferable in the soil column with a higher Fe content and bulk density, which provided more sorption sites and reaction time, respectively. However, a considerable amount of soil-bound As could be remobilized and released back to the pore water with the repetition of wetting and drying due to the transformation of As(V) to As(III).

Original languageEnglish
Article number126957
JournalJournal of hazardous materials
Volume422
DOIs
Publication statusPublished - 2022 Jan 15

Keywords

  • Arsenic
  • Redox sensitive behavior
  • Soil column experiment
  • Vadose zone
  • Wetting-drying cycle

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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