~(89)Sr在土壤中吸附的研究

探索了~(89)Sr在青紫泥、小粉土和红黄壤中的吸附。结果表明,~(89)Sr进入淹水土壤中之后,将迅速地被土壤吸附而达到吸附平衡,其动态变化规律为:小粉土(?)_1=682.47(1—e~(-3.9337t),红黄壤(?)_2=554.56(1—e~(-2.9856t),青紫泥(?)_3=718.81(1—e~(-4.8244t)。可见,它们达到吸附平衡的时间,小粉土约2.0d,红黄壤约2.5d,青紫泥约1.7d。它们的吸附率皆在50％以上;同时还求出了~(89)Sr在三种土壤中的分布系数:青紫泥为3.43cm~3/g、小粉土2.53cm~3/g、红黄壤1.54cm~3/g;因此,就它们吸附~(89)Sr能力来说,青紫泥>小粉土>红黄壤。

The study of 89Sr adsorbed in soil

Having studied the adsorbtion of strontium-89 in paddy soil on blue purple clay, paddy soil on powdery loam and red-yel-low earth, the results showed that after strontium-89 entered into the flood soil, it was quickly adsorbed by soil and reached the adsorption eguilibrium.The law of dynamic change was, C1=682.47 ( 1-e-3-9337t ) for paddy soil on powdery loam,C2=SS4.S6(1-e-2.9856t )for red-yellow earth, C3 = 718.81 (1-e-4.8244t ) for paddy soil on blue purple clay. It was clear that the time for these soils to reach the adsorption equilibrium was, paddy soil on powdery loam about 2.0 d, red-yellow earth about 2.5 d, and paddy soil on blue purple clay about 1.7 d. The rate of adsorption for all of them was more than 50 %. Simultaneously, the distribution coeffcients of strontium-89 in these three kinds of soil were worked out: paddy soil on blue purple clay was 3.43cm3/g, paddy soil on powdery loam was 2.53cm3/g. and red-yellow earth was 1.54cm3/g. Thus, from the ability of strontium-89 adsorption, the order was: paddy soil on blue purple clay paddy soil on powdery loam red-yellow earth.