摘要
采用模拟污染物的同位素示踪技术研究了141Ce在水体中的行为和3种水生植物对它的富集效应.结果表明,水体中141Ce的比活度随时间延长而减少,消失动态服从二项指数衰减规律CW =334.35e-1.1835t+23.75e-0.0961t, r2=0.99988;水生植物对水体中的141Ce均具有较强的富集能力,其中金鱼藻的浓集系数最高(最大值为3473.7),水葫芦和卡州萍的最大值分别为1426.0和380.6;因此金鱼藻可作为净化水体中放射性铈的首选植物.此外,底泥对水体中的141Ce也具有较强的吸附和固着能力.
Behaviour of 141Ce in waters and its high gathering effect in three aquatic plants were studied using the simulated pollutant isotope-tracer technique. The results showed that the specific activity of 141Ce in waters decreased with time, and the dynamics of disappearance could be expressed as two exponential rules: CW=334.35e-1.1835t+23.75e-0.0961t and r2=0.99988. The aquatic plant had strong high gathering ability of 141Ce in waters. The concentration factor of 141Ce in water by Ceratophyllum demersum was the highest (the maximum was 3473.7); and the maximum of concentration factor of Eichhornia crassipes and Azolla caroliniana were 1426.0 and 380.6 respectively. Ceratophyllum demersum could be used as the first selected plant to purge the radio-cerium in waters. Moreover, the bottom clay had also strong absorption and fixation abilities of 141Ce in waters.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2002年第2期105-108,共4页
China Environmental Science
基金
浙江省"九五"重点项目(961103084)
关键词
放射性铈
水生植物
富集
行为
浓集系数
radio-cerium
aquatic plant
high gathering
behaviour
concentration factor
