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Washing of Cadmium(II) from a Contaminated Soil Column
The washing of cadmium (from CdO(s)) from a soil column employing either an acid solution or EDTA (a strong metal chelator) was examined. For Cd(II) levels of 50 to 1000 mg/kg, the fraction removed was essentially independent of the initial Cd(II) concentration. The most efficient washing of cadmium was achieved using an acid wash solution at pH 2.5. Lower Cd(II) removals were found at lower pH, apparently due to inhibition of CdO(s) dissolution by constituents released from the soil under highly acidic conditions. EDTA wash solutions were employed at EDTA:cadmium molar ratios ranging from 1:1 to 10:1. Up to 90% removal of total Cd(II) was achieved at the 10:1 ratio after the passage of the first 50 PV of wash solution. Although higher chelate levels enhanced Cd(II) removal, the utilization efficiency of EDTA for cadmium decreased.
Washing of Cadmium(II) from a Contaminated Soil Column
The washing of cadmium (from CdO(s)) from a soil column employing either an acid solution or EDTA (a strong metal chelator) was examined. For Cd(II) levels of 50 to 1000 mg/kg, the fraction removed was essentially independent of the initial Cd(II) concentration. The most efficient washing of cadmium was achieved using an acid wash solution at pH 2.5. Lower Cd(II) removals were found at lower pH, apparently due to inhibition of CdO(s) dissolution by constituents released from the soil under highly acidic conditions. EDTA wash solutions were employed at EDTA:cadmium molar ratios ranging from 1:1 to 10:1. Up to 90% removal of total Cd(II) was achieved at the 10:1 ratio after the passage of the first 50 PV of wash solution. Although higher chelate levels enhanced Cd(II) removal, the utilization efficiency of EDTA for cadmium decreased.
Washing of Cadmium(II) from a Contaminated Soil Column
Davis, Allen P. (author) / Matange, Dilip (author) / Shokouhian, Mohammad (author)
Journal of Soil Contamination ; 7 ; 371-393
1998-05-01
23 pages
Article (Journal)
Electronic Resource
Unknown
EDTA , acid solution , CdO(s) , Cd(II).
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