Batch adsorption studies have shown that sphagnum moss peat, which is
essentially oligotrophic, in concentrations ranging from 4 to 40 g/l c
an be used effectively to remove hexavalent chromium from aqueous solu
tions. The process is pH dependent, the optimum range being 1.5-3. Tre
atment of the exhausted peat with 1 M NaOH removed only 50% of the sor
bed metal, suggesting that the binding to the peat involved strong che
misorption forces.