• 关键词：示踪试验  化学形态  载体  土壤  水稻

• 基金项目：

• 李书鼎
• 中国科学院沈阳应用生态研究所,110015

• 摘要：采用²¹⁰Pb示踪方法,研究了²¹⁰Pb和²¹⁰Bi在土壤和水稻中存在的形态.土壤中²¹⁰Pb主要以可给态存在,占总量的79％-91％.²¹⁰Bi主要以结合态存在,占总量的80％-98％,随时间增长,可给态²¹⁰Pb逐渐向结合态转变;结合态²¹⁰Bi向着可给态方向变化.进入水稻的²¹⁰Pb和²¹⁰Bi大部分是自由移动的离子形式,²¹⁰Pb的结合态<1％;²¹⁰Bi占40％.²¹⁰Pb和²¹⁰Bi性质上的差异表现了土壤对二者吸附力强弱的不同.还讨论了载体Pb对²¹⁰Pb和²¹⁰Bi吸附行为的影响.

• Abstract：Chemical species of ²¹⁰Pb and ²¹⁰Bi in soil and rice were investigated using 210Pb trace experiment. 79%-91% of 210Pb in the soil was in available fraction. On the contrary, 80%-98% of 210Bi was bound. The available 210Pb in the soil was changed slowly into bound fraction, while the bound 210Bi transformed gradually into available one. Much of 210Pb and 210Bi entered into rice were as inorganic free ions. The bound 210Pb in rice was less than l% and the bound 210Bi was around 40%. The different adsorption affinities between 210Pb and 210Bi were demonstrated by the different behavior of them. The effect of carrier-Pb on adsorption of 210Pb and 210Bi was also discussed.

• Key words：Tracer  fractionation  carrier  soil  rice

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