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Arsenic distribution and bioaccessibility across particle fractions in historically contaminated soils

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Abstract

Incidental soil ingestion is a common contaminant exposure pathway for humans, notably children. It is widely accepted that the inclusion of total soil metal concentrations greatly overestimates the risk through soil ingestion for people due to contaminant bioavailability constraints. The assumption also assumes that the contaminant distribution and the bioaccessible fraction is consistent across all particle sizes. In this study, we investigated the distribution of arsenic across five particle size fractions as well as arsenic bioaccessibility in the <250-, <100-, <10- and 2.5-μm soil particle fractions in 50 contaminated soils. The distribution of arsenic was generally uniform across the larger particle size fractions but increased markedly in the <2.5-μm soil particle fraction. The marked increase in arsenic concentration in the <2.5-μm fraction was associated with a marked increase in the iron content. Arsenic bioaccessibility, in contrast, increased with decreasing particle size. The mean arsenic bioaccessibility increased from 25 ± 16% in the <250-μm soil particle fraction to 42 ± 23% in the <10-μm soil particle fraction. These results indicate that the assumption of static arsenic bioaccessibility values across particle size fractions should be reconsidered if the ingested material is enriched with small particle fractions such as those found in household dust.

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Acknowledgements

The authors would like to thank the Cooperative Research Centre for Contamination Assessment and Remediation of the Environment and the University of South Australia for making this research possible.

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Authors and Affiliations

  1. Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA, 5095, Australia

    E. Smith, J. Weber & A. L. Juhasz

  2. CRC for Contamination Assessment and Remediation of the Environment, Mawson Lakes, SA, 5095, Australia

    E. Smith, J. Weber & A. L. Juhasz

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  1. E. Smith
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  2. J. Weber
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  3. A. L. Juhasz
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Correspondence to E. Smith.

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Smith, E., Weber, J. & Juhasz, A.L. Arsenic distribution and bioaccessibility across particle fractions in historically contaminated soils. Environ Geochem Health 31 (Suppl 1), 85–92 (2009). https://doi.org/10.1007/s10653-009-9249-2

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  • DOI: https://doi.org/10.1007/s10653-009-9249-2

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