The arsenic removal from aqueous medium was investigated through adsorption by employing finely powdered bark of Pinus
roxburghii Sarg. The batch mode laboratory scale experiments were conducted to investigate the removal efficiency of Pinus
bark against total arsenic and the effect of pH, contact time, adsorbent dose and initial adsorbate concentration on adsorption to
optimize the process. Langmuir and Freundlich isotherms were used to validate the adsorption data and respective constants were
evaluated. The removal efficiency was found to be dependent on pH, adsorbent dose, contact time and initial concentration. The
maximum arsenic uptake was 95 % at pH 4, 40 g L-1 adsorbent dose and 90 minutes contact time. The Freundlich constants, Kf
and n were found to be 3.5 mg g-1 and 0.529, respectively. The results obtained in this study clearly demonstrate the potential of
Pinus roxburghii Sarg. bark for the arsenic removal from aqueous solutions.