Copper and cadmium adsorption characteristics of selected acid and calcareous soils

Journal Article · · Soil Sci. Soc. Am. J.; (United States)

OSTI ID:6731472

Cavallaro, N; McBride, M B

Samples of two New York soils, an acid and a neutral silt loam, were equilibrated with Cu/sup 2 +/ and Cd/sup 2 +/ solutions in concentrations ranging from 10/sup -5/ to 10/sup -4/M in distilled water and in 0.01M CaCl/sub 2/. The extent of complexation and adsorption of the heavy metals was measured using specific ion electrodes and atomic absorption. The data were found to fit the Langmuir adsorption model, and the Cu/sup 2 +/ adsorption maxima were greater than those of Cd/sup 2 +/ for both soils. Acid soils demonstrated much less ability to retain the heavy metals than neutral soils. In the presence of 0.01M CaCl/sub 2/, adsorption of the metals was much reduced, suggesting Ca/sup 2 +/ competition for adsorption sites. A considerable amount of Cu/sup 2 +/ was complexed in the soil solution, but Cd/sup 2 +/ complexation was much less evident. The results support an ion exchange mechanism of adsorption in the surface soils, and suggest that precipitation occurs in calcareous subsoils.

• Research Organization: Cornell Univ., Ithaca, NY
• OSTI ID: 6731472
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 42:4; ISSN SSSJD
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
CADMIUM COMPOUNDS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
COMPARATIVE EVALUATIONS
COMPLEXES
COPPER COMPOUNDS
DISPERSIONS
FEDERAL REGION II
HALIDES
HALOGEN COMPOUNDS
ION EXCHANGE
MIXTURES
NEW YORK
NORTH AMERICA
PH VALUE
SOIL CHEMISTRY
SOILS
SOLUBILITY
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
USA