摘要
采用^(210)Pb示踪方法,研究了^(210)Pb和^(210)Bi在土壤和水稻中存在的形态.土壤中^(210)Pb主要以可给态存在,占总量的79％—91％.^(210)Bi主要以结合态存在,占总量的80％—98％,随时间增长,可给态^(210)Pb逐渐向结合态转变;结合态^(210)Bi向着可给态方向变化.进入水稻的^(210)Pb和^(210)Bi大部分是自由移动的离子形式,^(210)Pb的结合态<1％;^(210)Bi占40％.^(210)Pb和^(210)Bi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^(210)Pb和^(210)Bi吸附行为的影响.
Chemical species of ^(210)Pb and ^(210)Bi 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.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1993年第2期157-163,共7页
Acta Scientiae Circumstantiae
关键词
示踪法
载体
土壤
水稻
铅
铋
Tracer
fractionation
carrier
soil
rice,
