Effect of ionic strength and anions on zinc adsorption by two soils

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

OSTI ID:6794696

Shuman, L M

It is important to assess the effects of ionic strength and type of anion when studying adsorption of metals on soils and soil components because the background salt may complex metals and compete for adsorption sites. Four experiments were carried out to determine the effect of ionic strength and anions on Zn adsorption by two soils and to determine the effects of these two factors on the pH-adsorption relationships. Zinc adsorption using NO/sup -//sub 3/ at ionic strengths of 0.005 and 0.001 mol L/sup -1/ was the same but the adsorption at 0.05 and 0.1 mol L/sup -1/ was lower than for the other ionic strengths. The SO/sub 4//sup 2 -/ ion produced higher adsorption the NO/sub 3//sup -/ or Cl/sup -/ ions which yielded the same isotherm at pH 6. Increased ionic strength had similar effects at all pH levels studied. The three anions had no effect on the pH-adsorption curves which were exactly the same within a soil type. Plotting the activity of the free Zn in the systems vs. adsorbed Zn gave much the same results as when concentration data were used. In general, ionic strength and anions had no influence on the shape of the isotherms, showing that the same relationships would be found regardless of ionic strength or anion. The absolute values of the adsorption maxima were different in some cases.

• Research Organization: Univ. of Georgia, Experiment
• OSTI ID: 6794696
• Report Number(s): CONF-8611156-
• Conference Information: Journal Name: Soil Sci. Soc. Am. J.; (United States) Journal Volume: 50:6
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
ANIONS
CHARGED PARTICLES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CONTAMINATION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
IONS
ISOTHERMS
METALS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
RESPONSE MODIFYING FACTORS
SOIL CHEMISTRY
SOILS
SORPTION
ZINC