Abstract
Adsorption-desorption kinetics of potassium as influenced by temperature and background anion was investigated on soil samples of a typical alluvial profile (Tulewal loamy sand, Udic Ustochrepts) using continuous stirred flow reaction technique. Cumulative K adsorption decreased with increase in temperature from 298 K to 313 K and the decrease was more conspicuous in lower depths, where total adsorption of K was higher due to higher clay content and micaceous and vermiculitic clay minerals. Chloride as background anion helped in relatively higher K adsorption as compared to ClO 4 − ions. Apparent rates of K-exchange as calculated from first-order equation increased with increase in temperature and with change from Cl − to ClO 4 − as background anion. Although apparent desorption rate coefficient, (kd') was 2–3-fold lower than apparent adsorption rate coefficient, (ka′), but effect of increased temperature was more glaring in desorption of K; while adsorption rate increased by 25 to 36.5% with increase in temperature, corresponding increase in desorption rate was from 38.5 to 69.0%.
Published Version
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