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Bioaccessibility based in-situ remediation of lead-contaminated soils using local materials

Vazquez Miranda, Martina Laura
http://orcid.org/0000-0001-8136-847X
http://rave.ohiolink.edu/etdc/view?acc_num=osu1618999116362289

Abstract Details

2021, Master of Science, Ohio State University, Environmental Science.
Lead (Pb) speciation in soil is key for bioavailability assessment and exposure risk to humans from Pb contaminated soils. Soil ingestion is the main exposure pathway in Pb contaminated soils and in vitro bioaccessibility assays (IVBA) can predict relative bioavailable (RBA) Pb in soil by mimicking the GI tract conditions without traditional expensive animal feeding studies. In situ soil remediation has been considered an effective ecological treatment option compared to ex-situ techniques. The use of amendments such as biosolids, biochar, compost and phosphorous (P) amendments have been effective to decrease RBA in soils and, in doing so, reducing human exposure to the contaminant. In this study, soil amendments including biosolids, compost, wood-ash, biochar, soluble phosphate (SP) and their combinations were applied to Pb contaminated soil. Soil samples were incubated for up to 6 months at constant temperature, moisture and humidity. Samples were taken at three time points 1 (t1), 4 (t2) and 6 (t3) months of incubation and analyzed for total metal content, bioaccessible Pb (%IVBA-Pb), bioaccessible arsenic (%IVBA-As), organic carbon content (Org C), pH, extractable P and other key properties to determine the best treatment to reduce bioavailability of lead while improving soil health. Phosphorous was the most effective amendment to reduce %IVBA-Pb. Whether as individual or combined amendments, SP and biosolids resulted in 25-50% reductions of %IVBA Pb. Organic C addition did not reduce %IVBA-Pb, indicating complexation was not relevant for chemical immobilization of Pb in the case of strongly acidic soils such as the ones used in this experiment. %IVBA-As was correlated with pH and not P addition nor Organic C addition. Biosolid addition produced, apart from an expected plant available P increase, a great increase in Mineralizable Nitrogen content in the soils. Considering the importance of Nitrogen as an essential nutrient in plant growth, these results indicate that this amendment would be suitable for decreasing %IVBA-Pb and overall exposure to Pb contaminated soils. This is due to ensuring plant cover in the soils and decreasing soil erosion and loss, with the subsequent Pb dust dispersion, decreasing possible ingestion rates of the soil.
Nicholas Basta, Dr (Advisor)
Olorunfemi Adetona, Dr (Committee Member)
David Barker, Dr (Committee Member)
122 p.
Chemistry; Environmental Science; Environmental Studies; Soil Sciences
lead contaminated soil; in-situ remediation; amendments; biosolids; compost; biochar; fertilizer; woodash; smelter soil

Recommended Citations

Citations

  • Vazquez Miranda, M. L. (2021). Bioaccessibility based in-situ remediation of lead-contaminated soils using local materials [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618999116362289

    APA Style (7th edition)

  • Vazquez Miranda, Martina. Bioaccessibility based in-situ remediation of lead-contaminated soils using local materials. 2021. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1618999116362289.

    MLA Style (8th edition)

  • Vazquez Miranda, Martina. "Bioaccessibility based in-situ remediation of lead-contaminated soils using local materials." Master's thesis, Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618999116362289

    Chicago Manual of Style (17th edition)

osu1618999116362289
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