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Soil Extractions for Determining Heavy Metal Bioavailability in Mining Waste.
NTIS: PB 89-190123 :218 pages
Forage plots were established on agricultural lands contaminated by acid mining waste. The acid produced through oxidation of pyrite and other sulfides caused elevated solubility and plant availability of copper, zinc, and arsenic, which killed vegetation and polluted surface and ground water. Soil amendments including agricultural lime (caco3), hydrated lime (ca(oh)2), phosphorus, and organic matter were used to reduce the toxicity of metals. Several acid- tolerant grasses were used to vegetate the amended soils. Various soil extraction techniques were used to see which best correlated with vegetation performance. The extractions corresponded to three "forms" of metals in soil, including soluble (water-saturation extract); plant-available, weakly adsorbed (dtpa extract); and total (hno3/h2o2 extract). Of the extractants tested, the dtpa levels appeared to correlate best with metal levels in plant tissue. The dtpa soil extractant serves as a useful tool in predicting potential phytotoxicity of mine waste materials.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 89-190123
Schafer and Associates
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division