Chemistry of lead and cadmium in soil: solid phase formation

Journal Article · Tue Dec 31 23:00:00 EST 1974 · Soil Sci. Soc. Am., Proc.; (United States)

DOI:https://doi.org/10.2136/sssaj1975.03615995003900050020x· OSTI ID:7365245

Santillan-Medrano, J; Jurinak, J J

Equilibrium batch studies were conducted to obtain solubility data of Pb and Cd in soils. The data were plotted on equilibrium solubility diagrams using pH as the master variable. In the construction of the diagram the hydroxide, carbonate, and phosphate compounds of Pb and Cd were given particular attention. Both Pb and Cd solubility decreased in the soils as pH increased. The lowest values were obtained in the calcareous soil. Under a given set of conditions, however, Cd activity in solution was always notably greater than that of Pb. In noncalcareous soils the solubility of Pb appeared to be regulated by Pb(OH)/sub 2/, Pb/sub 3/(PO/sub 4/)/sub 2/, Pb/sub 4/O(PO/sub 4/)/sub 2/, Pb/sub 5/(PO/sub 4/)/sub 3/OH, depending on the pH. In calcareous soils, PbCO/sub 3/ also assumed importance. At higher Cd concentrations the precipitation of Cd/sub 3/(PO/sub 4/)/sub 2/ and/or CdCO/sub 3/ regulated cadmium solubility. At low Cd concentrations the equilibrium solution was undersaturated with regards to both Cd/sub 3/(PO/sub 4/)/sub 2/ and CdCO/sub 3/.

• OSTI ID: 7365245
• Journal Information: Soil Sci. Soc. Am., Proc.; (United States), Journal Name: Soil Sci. Soc. Am., Proc.; (United States) Vol. 39:5; ISSN SSSAA
• Country of Publication: United States
• Language: English

Related Subjects

510100* -- Environment
Terrestrial-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
CADMIUM CARBONATES
CADMIUM COMPOUNDS
CADMIUM PHOSPHATES
CARBON COMPOUNDS
CARBONATES
CONTAMINATION
DATA
EQUILIBRIUM
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
KINETICS
LEAD CARBONATES
LEAD COMPOUNDS
LEAD HYDROXIDES
LEAD PHOSPHATES
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
REACTION KINETICS
SOILS
SOLUBILITY