Phosphate-Based Treatment of Contaminated Land in Jasper County, Missouri. Missouri Department of Natural Resources David E. Mosby, RG [email protected] 573/751-3356. Two Separate EPA Grants. Bioavailability of Lead Contaminated Residential Soil treated using In Situ Phosphate
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Residential Soil Background
in surface soils
over 800 ppm in Joplin, MO
PHOSPHATE TREATMENTWorking HypothesisAddition of phosphoric acid to Pb contaminated Joplin soil will result in formation of chloropyromorphite and reduce the Pb bioavailability and solubility.
5 Pb2+ + 3 H2PO4-+ Cl- ----> Pb5(PO4)3Cl + 6H+
log K = -25.05
I. A. Soil Characterization and Bench Treatment of Smelter Soils
I. B. Dosing of Treated and Untreated Bench Soils to
Immature Swine to Determine Bioavailability
II. A. Field Treat Soils and Characterize Pb and Distribution
II. B. Dosing of Treated and Untreated Field Treated Soils
Study Design cont.
III. A. Incubation of Bench Soils
III. B. Dosing of Incubated Soils
IV. Dosing of Field Soils Over Time to Pigs
V. Analyze Plant Tissue in Field Plots Over Time
Former and Abandoned Pb/Zn Mine Demonstration Project
Revegetation Using Biosolids
Close mine shafts
Barren Chat & Tailings
Phosphate in organic matter
- added 2500-5000 ppm P as TSP to highly
Organic Matter Application
Upland Site 1 Year Post Reclamation
Center Creek Site 6 Months Post Reclamation
A happier duck!!!