Behavior and Distribution Coefficient of Some Elements in Soil under Natural Condition

对自然条件下超速离心机采集的表层土壤和土壤孔隙水中的某些元素进行了测定。测定了它们的垂直剖面和间隙水的阴阳离子平衡。估算了可分别适用于分配系数的稳定元素(Cs、Co、Cr、Zn、Sb)的分配比。1996年，在KUR-RI的杂草地，原状土壤从表层到约80 cm深处，主要离子物质(特别是钾和硝酸盐)的浓度在15 cm处突然下降，表明土壤中的有机质发生了溶解。1997年，用岩心采样器在麦巴拉町农田采集了20 cm深度的扰动土壤(A、B、C、D)。土壤中主要离子物质的浓度随深度的增加而逐渐降低，表明土壤表面施入了肥料。在顶点，由于没有分析碱度，总阳离子比总阴离子大2-5倍。阴阳离子比在B、C、D点基本一致。计算了Cs(10^1~10^3)、Co(10^0~10^1)、铬、锌、Sb(10^0~10^1)土壤交换性含量与孔隙溶液浓度的分配比。这些值都在以前工作中指出的分配系数的范围内。这项研究开发了评估有效非饱和分配比的有用程序。

Some elements in surface soil and soil pore water which was collected by an ultracentrifuge, under natural condition were measured. vertical profile of them and cation-anion balance of interstitial water were examined. Distribution ratios of stable elements(Cs, Co, Cr, Zn, Sb)which can be applicable to distribution coefficients respectively, were estimated.In 1996, undisturbed soil was taken from surface to the depth of about 80cm in weed land at KUR-RI.Concentrations of main ionic substances(especially potassium and nitrate)were abruptly decreased at the depth of 15cm, thus indicating dissolution of organic materials in soil. Total cation was almost equal to total anion.In 1997, disturbed soils(A,B,C,D)were taken from surface to the depth of 20cm with core sampler in cultivated field at Maibara-cho. Concentrations of main ionic substances were gradually decreased with depth, thus indicating addition of fertilizer onto soil surface. At Apoint, total cation was 2-5 times lager than total anion, owing to no analysis of alkalinity. Cation-anion ratio was almost unity at B,C,D point. Distribution ratios between exchangeable content in soil and concentration of pore solution were calculated for Cs(10^1-10^3), Co(10^0-10^1), Cr, Zn, Sb(10^0-10^1). The Values were in the range of distribution coefficients which were indicated in previous works. This research develop the useful procedure to evaluate effective unsaturated distribution ratios.