In vitro assessment of arsenic bioaccessibility in contaminated (anthropogenic and geogenic) soils

Albert L. Juhasz, Euan Smith, John Weber, Matthew Rees, Allan Rofe, Tim Kuchel, Lloyd Sansom, Ravi Naidu

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Abstract

Arsenic (As) bioaccessibility in contaminated soils (n = 50) was assessed using the simplified bioaccessibility extraction test (SBET). Soils used in the study were collected from sites where As was used as an herbicide (railway corridor) or pesticide (cattle dip sites), from former gold mines and from highly mineralised locations containing geogenic As sources (gossans). In all but three soils, As bioaccessibility was less than 50% indicating that a significant proportion of the total As concentration may not be available for absorption in the gastrointestinal tract following incidental soil ingestion. When regression models were developed based on soil properties, the descriptive variables best able to describe As bioaccessibility in railway corridor, dip site and mine site soils were total As and total or dithionite-citrate extractable (free) iron (Fe). While As bioaccessibility could be predicted (r2 = 0.955, n = 50) in these contaminated soils, As bioaccessibility for gossan soils was a poor fit using linear or multivariate regression analysis.

Original languageEnglish
Pages (from-to)69-78
Number of pages10
JournalChemosphere
Volume69
Issue number1
DOIs
Publication statusPublished - Aug 2007

Keywords

  • Arsenic
  • Bioaccessibility
  • Model
  • SBET

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Juhasz, A. L., Smith, E., Weber, J., Rees, M., Rofe, A., Kuchel, T., ... Naidu, R. (2007). In vitro assessment of arsenic bioaccessibility in contaminated (anthropogenic and geogenic) soils. Chemosphere, 69(1), 69-78. https://doi.org/10.1016/j.chemosphere.2007.04.046