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Issue 3, 2013
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Evaluation of a low-cost commercially available extraction device for assessing lead bioaccessibility in contaminated soils

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Abstract

The U.S. EPA's in vitro bioaccessibility (IVBA) method 9200.1-86 defines a validated analytical procedure for the determination of lead bioaccessibility in contaminated soils. The method requires the use of a custom-fabricated extraction device that uses a heated water bath for sample incubation. In an effort to improve ease of use, increase sample throughput, and reduce equipment acquisition and maintenance costs, an alternative low-cost, commercially available extraction device capable of sample incubation via heated air and end-over-end rotation was evaluated. An intra-laboratory study was conducted to compare lead bioaccessibility values derived using the two extraction devices. IVBA values were not statistically different (α = 0.05) between the two extraction devices for any of the soils (n = 6) evaluated in this study, with an average difference in mean lead IVBA of 0.8% (s.d. = 0.5%). The commercially available extraction device was able to generate accurate lead IVBA data as compared to the U.S. EPA's expected value for a National Institute of Standards and Technology standard reference material soil. The relative percent differences between high and low IVBA values for each soil, a measure of instrument precision, were also not statistically different (α = 0.05) between the two extraction devices. The statistical agreement of lead IVBA values observed using the two extraction devices supports the use of a low-cost, commercially available extraction device as a reliable alternative to a custom-fabricated device as required by EPA method 9200.1-86.

Graphical abstract: Evaluation of a low-cost commercially available extraction device for assessing lead bioaccessibility in contaminated soils

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Article information


Submitted
25 Sep 2012
Accepted
14 Dec 2012
First published
09 Jan 2013

Environ. Sci.: Processes Impacts, 2013,15, 573-578
Article type
Paper

Evaluation of a low-cost commercially available extraction device for assessing lead bioaccessibility in contaminated soils

C. M. Nelson, T. M. Gilmore, J. M. Harrington, K. G. Scheckel, B. W. Miller and K. D. Bradham, Environ. Sci.: Processes Impacts, 2013, 15, 573
DOI: 10.1039/C2EM30789H

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