EPA Science Inventory

Evaluation of a Low-Cost Commercially Available Extraction Device for Assessing Lead Bioaccessibility in Contaminated Soils

Citation:

Nelson, C., T. Gilmore, J. Harrington, K. Scheckel, B. Miller, AND K. Bradham. Evaluation of a Low-Cost Commercially Available Extraction Device for Assessing Lead Bioaccessibility in Contaminated Soils. Environmental Science: Processes & Impacts. RSC Publishing, Cambridge, Uk, 15(3):573-578, (2013).

Description:

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.

Purpose/Objective:

The National Exposure Research Laboratory′s (NERL′s) Human Exposure and Atmospheric Sciences Division (HEASD) conducts research in support of EPA′s mission to protect human health and the environment. HEASD′s research program supports Goal 1 (Clean Air) and Goal 4 (Healthy People) of EPA′s strategic plan. More specifically, our division conducts research to characterize the movement of pollutants from the source to contact with humans. Our multidisciplinary research program produces Methods, Measurements, and Models to identify relationships between and characterize processes that link source emissions, environmental concentrations, human exposures, and target-tissue dose. The impact of these tools is improved regulatory programs and policies for EPA.

URLs/Downloads:

Environmental Science Processes and Impacts   Exit

HEASD-12-019 EVALUATION OF A LOW-COST ETC _ FINAL FINAL .PDF   (PDF,NA pp, 374.182 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 02/26/2013
Completion Date: 02/26/2013
Record Last Revised: 10/25/2013
Record Created: 02/26/2013
Record Released: 02/26/2013
OMB Category: Other
Record ID: 252575

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL EXPOSURE RESEARCH LAB

HUMAN EXPOSURE AND ATMOSPHERIC SCIENCES DIVISION

METHODS DEVELOPMENT & APPLICATION BRANCH