Bioavailability, Bioaccessibility and speciation data. This dataset is not publicly accessible because: EPA cannot release personally identifiable information regarding living individuals, according to the Privacy Act and the Freedom of Information Act (FOIA). This dataset contains information about human research subjects. Because there is potential to identify individual participants and disclose personal information, either alone or in combination with other datasets, individual level data are not appropriate to post for public access. Restricted access may be granted to authorized persons by contacting the party listed. It can be accessed through the following means: Karen Bradham bradham.karen@epa.gov or Tyler Sowers sowers.tyler@epa.gov. Format: The data were generated using EPA and HUD samples. All of the soil and dust samples were provided to CEMM for research and methods development based on the agreement that the specific sample identifiers would not be released. The samples identifications for the HUD samples are considered PII and the EPA Regional soils samples are not identified because some of these locations may be in litigation.