放射性核素^(60)Co在土壤中吸附和解吸的动力学研究  

Kinetic Research on Adsorption and Desorption of Cobalt-60 in Soils

作　　者：邵敏[1] 蔡志强[2] 赵希岳[2] 冯俊生[1] 

机构地区：[1]江苏工业学院环境与安全工程系,江苏常州213164 [2]江苏工业学院化学工程系

出　　处：《江苏工业学院学报》2006年第3期11-15,共5页Journal of Jiangsu Polytechnic University

基　　金：国家自然科学基金资助项目(39570149);江苏省环境保护厅资助项目(2003076)

摘　　要：应用同位素示踪技术,研究了60Co在小粉土、黄红壤、青紫泥和海泥中的吸附和解吸。结果表明,60Co进入淹水土壤之后,迅速地被土壤吸附而达到吸附平衡,不易解吸。吸附率和分配系数大小排列顺序均为:海泥>青紫泥>黄红壤>小粉土;解吸因数的大小排列顺序为:黄红壤>小粉土>青紫泥>海泥6。0Co在土壤中的动态变化可用封闭二分室进行描述,其动态变化规律为,小粉土C1=1 382.6(1-e-3.609 5t),黄红壤C2=1 570.6(1-e-5.510 4t),青紫泥C3=1 594.9(1-e-7.554 1t),海泥C4=1 643.9(1-e-13.092 1t)。The isotopic tracer technique was applied to study the adsorption and desorption of cobalt-60 in paddy soil on powdery loam, yellow-red earth, paddy soil on blue purple clay and sea clay. The results show that after cobalt-60 entered into the flood soil, it was quickly adsorped by soil and reached the adsorption equilibrium, but it was difficult to be desorbed. The order of the saturated adsorption rate and Kd （distribution coefficient） of cobalt-60 at the balance value was： sea clay〉puddy soil on blue purple clay〉yellow - red earth〉paddy soil on powdery loam. The order of Df （desorption factor） value is： yellow-red earth〉paddy soil on powdery loam〉puddy soil on blue purple clay〉sea clay. The dynamic behavior of cobalt-60 in the soils can be described by a closed two-compartment model and C1=1 382.6 （1-e^-3.6095t） for paddy soil on powdery loam, C2=1 570.6 （1-e^-5.5104t） for yellow-red earth, C3=1 594.9 （1-e^-7.5541t） for paddy soil on blue purple clay, C4=1 643.9 （1-e^-13.0921t） for sea clay, respectively.

关 键 词：^60CO 土壤 吸附 解吸 示踪动力学 

分 类 号：X591[环境科学与工程—环境工程] X131.3