Effects of dissolution kinetics on bioaccessible arsenic from tailings and soils

► An exponential curve describes dissolution kinetics under gastric conditions. ► A logarithmic or a linear pattern describes kinetics under intestinal conditions. ► Kinetic behaviours can be typified by arsenopyrite, scorodite or yukonite minerals. ► Steady state bioaccessible arsenic concentration...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2011-09, Vol.84 (10), p.1378-1385
Main Authors: Meunier, Louise, Koch, Iris, Reimer, Kenneth J.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Arsenic
Arsenic - analysis
Arsenic - chemistry
Arsenic - metabolism
Bioaccessibility
Biological and medical sciences
Contaminated soils
Dissolution kinetics
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
Gastrointestinal Tract - metabolism
General aspects
Hydrogen-Ion Concentration
Kinetics
Mining
Models, Biological
Models, Chemical
Particle size
Risk Assessment
Soil - chemistry
Soil Pollutants - analysis
Soil Pollutants - chemistry
Soil Pollutants - metabolism
Tailings
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Summary:► An exponential curve describes dissolution kinetics under gastric conditions. ► A logarithmic or a linear pattern describes kinetics under intestinal conditions. ► Kinetic behaviours can be typified by arsenopyrite, scorodite or yukonite minerals. ► Steady state bioaccessible arsenic concentrations were not obtained in all samples. ► Longer extraction or extrapolation model may improve bioaccessibility estimates. Dissolution kinetics of arsenic from soils and tailings were studied under simulated gastrointestinal conditions to determine the effects of residence time, pH and soil composition on the bioaccessibility of arsenic. The samples were sieved to four particle size fractions from bulk to
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2011.05.019