Mechanisms and Permanence of Sequestered Pb and As in Soils: Impact on Human Bioavailability
Technical Report,27 May 2010,27 Nov 2015
The Ohio State University Columbus United States
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Results from ER-1742 provide site managersrisk assessors the following defensible science to implement bioavailability. All of the IVBA methods con be used to predict RBA As. The CAB was more accurate for low RDA As soils and for soils with high reactive Al and Fe oxides. Non-CAB methods under predicted RBA As for these soils. IVBA methods using gastric extraction provide a more conservative RBA As. Equations to predict RBA As from on IVBA method that has a valid IVIVC with one animal model. Arsenic speciation alone is not predictive of IVBA or RBA As. However, As speciation is very important to provide useful information to decide whether to consider adjusting for bioavailability in a risk assessment Results from ER-1742 show sequestered Pb in P-treated soil is stable. Neither biological fungal treatments or chemical acidification pH 3 affected Pb mobility, bioaccessibility or bioavailability in P-treated soils. Low bioavailability mineral forms of Pb formed from P treatment in Joplin contaminated soil hos remained stable over n long period of time 10 y. The Pb minerals in the P treated soil are stable to acid inputs i.e., natural or fertilizer, acid rain, etc to very acidic soil pH 3.
- Solid Wastes and Pollution and Control