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Soil Extractions for Determining Heavy Metal Bioavailability in Mining Waste.

Authors
Schaefer-WM; Smith-T
Source
NTIS: PB 89-190123 :218 pages
Link
NIOSHTIC No.
10007029
Abstract
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.
Publication Date
19890101
Document Type
CP; Final Contract Report;
Fiscal Year
1989
NTIS Accession No.
PB89-190123
NTIS Price
A11
Identifying No.
OFR 14-89
NIOSH Division
WO;
Source Name
NTIS: PB 89-190123
Performing Organization
Schafer and Associates
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