Adsorption of cadmium on soil constituents in the presence of complexing ligands

Journal Article · Wed Apr 01 04:00:00 EST 1981 · J. Environ. Qual.; (United States)

DOI:https://doi.org/10.2134/jeq1981.00472425001000020021x· OSTI ID:6585415

Chubin, R G; Street, J J

The objective of this study was to evaluate the effect of natural and synthetic complexing agents on Cd/sup 2 +/ adsorption characteristics of metal hydroxides and silicate clay minerals. The solution pH at which 50% of the initial solution Cd/sup 2 +/ was adsorbed was 5.40, 7.00, 7.80, and 8.30 for Al(OH)/sub 3/, Fe(OH)/sub 3/, montmorillonite, and kaolinite, respectively. The presence of citrate (C/sub 6/H/sub 5/O/sub 7//sup 3 -/) depressed Cd adsorption on Al(OH)/sub 3/ by approximately 25% in acidic solutions. The addition of EDTA (C/sub 10/H/sub 16/O/sub 8/N/sub 2/) depressed the Cd adsorption on both Al and Fe hydroxides, montmorillonite, and kaolinite in acidic and alkaline solutions. The water-soluble organic fraction from sewage sludge enhanced Cd adsorption by both kaolinite and montmorillonite in alkaline solutions. The water-soluble organic fraction from an oganic soil (Terra Ceia muck) increased Cd adsorption by Fe(OH)/sub 3/ only under acidic conditions. Preliminary results indicated that considerations of Cd retention by soil constituents should include not only the aqueous chemistry of Cd and the surface chemistry of the adsorbent, but also the chemistry of natural and synthetic complexing agents. The interaction of Cd and various complexing agents can play an important part in determining the fate of this metal in the soil-water-plant environment.

• Research Organization: Univ. of Florida, Gainesville
• OSTI ID: 6585415
• Journal Information: J. Environ. Qual.; (United States), Journal Name: J. Environ. Qual.; (United States) Vol. 10:2; ISSN JEVQA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
CADMIUM
CHELATING AGENTS
CLAYS
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON COMPOUNDS
IRON HYDROXIDES
METALS
MINERALS
OXYGEN COMPOUNDS
SOILS
TRANSITION ELEMENT COMPOUNDS