| The characteristics of the deposition of iron and manganese in the brown red soil and yellow brown soil of subtropical area were studied using soil columns leached by the mixed solution of iron and manganese（0~0.04 mol·L-1），and their isothermal adsorptions to Pb2+ and Cd2+ by the leached soils were studied by batch experiments. The results were as follows：after soils were leached in the columns, manganese deposited 0.24~1.17 mg·g-1 less in brown red soils than those in yellow brown soils, and the contents of free iron and amorphous iron were significantly higher than those of manganese oxides in the samples. The maximum adsorption capacities to Pb2+ and Cd2+ of leached soil samples were higher than those of the soils not leached, and the increased maximum was up to 33.07 mmol·kg-1. Soil samples at the upper part of the column（column packing at 5 cm）had a larger adsorption capacity compared with the lower（column packing at 25 cm）samples, and the maximum of adsorption difference reached to 16.22 mmol·kg-1. The adsorption amounts to Pb2+ of two leached soils were 8~15 times higher than those of Cd2+. |
