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

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...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2007-08, Vol.69 (1), p.69-78
Main Authors: Juhasz, Albert L., Smith, Euan, Weber, John, Rees, Matthew, Rofe, Allan, Kuchel, Tim, Sansom, Lloyd, Naidu, Ravi
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Arsenic
Arsenic - analysis
Bioaccessibility
bioavailability
Biological and medical sciences
catle dip sites
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
Gastric Juice - chemistry
General aspects
General aspects. Techniques
Geological Phenomena
Geology
Gold
herbicide residues
Herbicides - analysis
Hydrogen-Ion Concentration
in vitro studies
Industrial Waste
Insecticides - analysis
Iron - analysis
Methods and techniques (sampling, tagging, trapping, modelling...)
mine spoil
Mining
pesticide residues
polluted soils
railroads
railway corridors
SBET
Soil Pollutants - analysis
soil pollution
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Summary: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 ( r 2 = 0.955, n = 50) in these contaminated soils, As bioaccessibility for gossan soils was a poor fit using linear or multivariate regression analysis.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2007.04.046