• 关键词：吸附  土壤  放射性示踪剂铅  铋

• 基金项目：

• 李书鼎
• 中国科学院林业土壤研究所

• 张海荣
• 中国科学院林业土壤研究所

• 摘要：根据土壤中几种无机配位体浓度,推算了Pb不同沉淀形式所对应的浓度,并将其与²¹⁰Pb示踪实验测量值对比,证明土壤中Pb主要是以磷酸盐形式存在。²¹⁰Bi和Pb共沉淀后被土壤吸附。pH对土壤²¹⁰Pb（Pb）、²¹⁰Bi、吸附影响曲线形状相似。土壤Pb和²¹⁰Bi分别在pH值为5和2.6时解吸。测定了土壤—水系统中²¹⁰Pb和²¹⁰Bi的分配系数,分别为（0.5—0.6）×10³和（0.3—3.0）×10⁴。

• Abstract：The Pb speciality in meadow brown soil was studied by chemical equilibrium calculation and ²¹⁰Pb tracer experiment. The results showed that the dominant species of Pb in the soil was phosphate. A similar experiment demonstrated that ²¹⁰Bi was adsorpted on soil particles after coprecipitated with Pb. Desorption of Pb and ²¹⁰Bi occurred at pH less than 5 and 2.6, respectively. At pH greater than 12.5, both metals tended to be desorpted from soil particles, though the desorption process of Pb is much more fast than that of ²¹⁰Bi. The distribution coefficients of ²¹⁰Pb and ²¹⁰Bi in the soil-water system were measured to be (0.5-6.0) ×10³ and (0.3-3.0) ×10⁴,respectively.

• Key words：adsorption  soil  rediotracer  lead  bismuth.

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