Abstract
Adsorption of manganese in the presence of Na2SO4 has been studied on nine soil samples from Punjab (S-1 to S-6) and Himachal Pradesh (S-7 to S-9) at 25 degrees and 35 degrees C Adsorption of manganese increases with increase in concentration of adsorbate; adsorption isotherms being L-shaped. The adsorption of manganese decreases with increase in temperature. The averaged values of partial molar free enegy change (Delta (G) over bar) and apparent heats of adsorption Delta H have been calculated. The data conform to the Freundlich and the Langmuir equations.