![[logo] US EPA](https://webarchive.library.unt.edu/eot2008/20081109035307im_/http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
Bioavailability in Soil - News
The Standard Operating Procedure for an In Vitro Bioaccessibility Assay for Lead in Soil is now available in PDF format from the Guidance page
The ISEA Bioavailability Symposium took place in October 2007. Proceedings in PDF format are now available online from the Related Links page.
Key Links for Risk Assessors
What is bioavailability?
Bioavailability is a measure of how much of a contaminant is absorbed when people are exposed to that contaminant through inhalation, skin contact or food intake.
What is relative bioavailability?
Relative bioavailability is how much of a contaminant is absorbed from soil as compared to how much of that contaminant is absorbed from food or water.
Bioavailability is the amount of a contaminant that is absorbed into the body following skin contact, ingestion, or inhalation. Relative bioavailability is how much of a contaminant is absorbed from soil as compared to how much of that contaminant is absorbed from food or water. This Web site describes how EPA is incorporating relative bioavailability information for human exposures at Superfund sites exposed to soil contaminants via oral pathway. This Web site does not address non-human exposures.
| Basic Information - contains basic information on human relative bioavailability at Superfund sites. | Human Health - an overview of relative bioavailability of contaminants in soil and effect on human health risk assessment. |
| Guidance - contains free downloads of technical reports, guidance documents, and short sheets related to relative bioavailability risk assessment issues at Superfund sites. | Technical Assistance - provides information on EPA workgroups that focus on risk issues at Superfund sites. |
| Related Links - links to Web sites of interest. |