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Kinetic research on adsorption and desorption of Zirconium-95 in soils

The isotopic tracer technique is applied to study the adsorption and desorption of zirconium 95 in paddy soil on powdery loam, yellow red earth, paddy soil on blue purple clay and sea clay, the results show that after zirconium 95 entered into the flood soil, it was quickly adsorped by soil and reached the adsorption equilibrum, and desorped difficultly. The order of the saturated adsorption rate and K d (distribution coefficient) of zirconium 95 at the balance value is: sea clay, puddy soil on blue purple clay, paddy soil on powdery loam, yellow red earth. The order of D f(desorption factor) value is: yellow red earth, paddy soil on powdery loam, puddy soil on blue purple clay, sea clay. The dynamic behavior of zirconium 95 in the soils can be described as a closed two compartment model. The law of dynamic change was, C 1=1474.7(1 e -3.5275t ) for paddy soil on powdery loam, C 2=1481.6(1 e -2.7535t ) for yellow red earth, C 3=1570.6(1 e -5.4104t ) for paddy soil on blue purple clay, C 4=1750.8(1 e -9.7195t ) for sea clay.