Nickel can be enriched on peat and the maximum adsorption capacity can be achieved when the pH range of the solution is 6 to 8.When pH<6,the adsorbed nickel increases along with rising pH.The enhancement of ion strength in the medium can cause a sharp decline of adsorption and a similar effect can be observed with the heightening of solution temperature.The nickel adsorbed on peat increase together with the raise of nickel concentration in the solution.The adsorption isotherm of Ni~(2+) onto peat conforms t...