Adsorption behavior of copper and zinc in soils: Influence of pH on adsorption characteristics

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Soil Science; (USA)

DOI:https://doi.org/10.1097/00010694-199008000-00004· OSTI ID:5547977

Msaky, J J ^[1]; Calvet, R ^[2]

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1. Sokoine Univ. of Agriculture, (Tanzania)
2. Institute National Agronomique, Paris (France)

The authors studied adsorption of copper and zinc on three different soils: a brown silty soil, an Oxisol, and a Podzol. They determined the amounts adsorbed and the shapes of adsorption isotherms as a function of the pH of the adsorbing medium at a constant ionic strength. The adsorbed amount-pH relationship depended strongly on the natures of the metallic cation and of the soil. The pH greatly influenced the characteristics of adsorption isotherms. They based interpretation on the variations with the pH of both adsorbent affinity for the metal in relation to the surface electric charge and chemical speciation in solution. The adsorption mechanism in the Oxisol probably involves monohydroxylated cations but is more determined by bivalent cations in the brown silty soil and the Podzol. From a general point of view, adsorption of copper and zinc cannot be represented with a single adsorption constant, but should be described by adsorption isotherms obtained at various pH values.

• OSTI ID: 5547977
• Journal Information: Soil Science; (USA), Vol. 150:2; ISSN 0038-075X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
COPPER
ADSORPTION
SOILS
CHEMICAL REACTION KINETICS
ZINC
ADSORPTION ISOTHERMS
CATIONS
PH VALUE
CHARGED PARTICLES
ELEMENTS
IONS
ISOTHERMS
KINETICS
METALS
REACTION KINETICS
SORPTION
TRANSITION ELEMENTS
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)