In order to find out the adsorption characteristics of Mn (Ⅱ) and Ni (Ⅱ) in typical soil (browns soil and rice paddies sand ) in mining area of southern Shaanxi

and to provide certain theoretical basis for prevention and control pollution of manganese in the mining area

in this paper the adsorption behavior of Mn (Ⅱ) and Ni(Ⅱ) in typical soil was studied by using vibration batch equilibrium techniques

coupled with dynamics and thermodynamic absorption models and infrared spectroscopic (FTIR) analysis

it aimed to determine the mechanism and affecting factors of Mn (Ⅱ) and Ni (Ⅱ) absorption by the soil. The results showed that the absorptions of Mn (Ⅱ) and Ni (Ⅱ) by the two types soil achieved equilibrium within 120 min

the adsorption capacity of the metal on browns soil was much higher than the rice paddies sand

the maximum adsorption capacity of Mn (Ⅱ) and Ni (Ⅱ) on browns soil determined to be 2.12 mg/g and 1.19 mg/g，whereas on rice paddies sand reached 1.32 mg/g and 0.78 mg/g respectively. The adsorption kinetics process of Mn (Ⅱ) and Ni (Ⅱ) in the two kinds of soil could be well interpreted by three isotherm models (i.e.

pseudo-first-order kinetic

bi-constant and intra-particle diffusion models)

the alignment with the models for the browns soil of adsorption dynamics were higher than for the rice paddies sand. In two kinds of soil the adsorption isotherm of Mn (Ⅱ) and Ni (Ⅱ)

Freundlich equation was superior to the Langmuir adsorption isotherm equation. Within the pH range in the study

pH value had little influence on the adsorption efficiency of Mn (Ⅱ) from aqueous solution

but had some influence on Ni (Ⅱ)

whereas the desorption of the two kinds metal was affected by pH value

and metal could be desorbed from soil only when the pH value of solution was less than 3. The relation of basic physical and chemical properties of soil

adsorption parameters and FTIR analysis demonstrated that soil organic matter played an important role in adsorption of Mn (Ⅱ) and Ni (Ⅱ).