Abstract:
Different concentrations of Zn ranging between 2 to 128 mg/I were equilibrated with selected alluvial and loess soils and the data was fitted to the Langmuir equation (C/x/m = 1/Kb + 1/bC) for the calculation of adsorption coefficients. For alluvial soils the adsorption maxima b1 and b2 ranged from 0.042 to 0.301 mg/g and 0.921 to 1.897 mg/g with an average of 0.192 mg/g and 1.480 mg/g, respectively. The loess soils b1 and b2 ranged from 0.309 to 0.416 mg/g and 1.381 to 2.309 mg/g with average values of 0.363 mg/g and 1.670 mg/g respectively. The values of binding energy coefficients, k1 and k2 for alluvial soils ranged from 0.555 to 3.607 ml/g and 0.016 to 0.058 ml/g with their mean values of 1.114 mL/g and 0.034 mf/g respectively. For loess soils the range was 0.115 to 0.858 ml/g for k1, with average value of 0.831 ml/g, and 0.024 to 0.035 ml/g for k2, with an average of 0.029 ml/g. The adsorption capacity of loess soils were found to be higher than alluvial soils. The Langmuir coefficients were related to soil properties such as pH, clay content, CaCO3 and cation exchange capacity (CEC). The study revealed that soils high in pH and clay content have higher adsorption capacities.
Page(s):
62-68
DOI:
DOI not available
Published:
Journal: Physical chemistry, Volume: 8, Issue: 1, Year: 1989