The experiment tested that humin can enrich Ni
2+ by means of liquid scintillation counting. The procedures were effected by pH value, amount of humin and initial aqueous concentration of nickel. There may be exist reversible transitions among humic acid, fulvic acid and humin for variation of ultra-violet of peat or humin into nickel solution. Freundlich equation can describe the adsorption reaction of Ni
2+ onto humin excellently. Nickel-humin -dual-complexation mode play an primary part in the adsorption owing to Freundlich [KG*3]adsorption [KG*3]exponent 0.684 4. Freundlich adsorption exponent （0.638 2，
0.684 4）and common logarithm of adsorption index （1.693 2，1.711 5）for peat and humin are almost equal. They indicate that humin may control the binding ability of Ni
2+ onto peat. The results show that humin can act as a potential material for permeable reactive barrier.
2007, 20 (2):
5-8.
