水生生态系统对稀土元素富集作用的模拟研究

模拟研究了混合稀土进入水生生态系统后，在浮萍、鲤鱼、水及底泥中的富集和分布。结果表明，外源稀土进入水生生态系统后，在底泥和水中的含量时间波动不大，而在浮萍和鲤鱼中的含量随时间却有很大的变化。外源稀土在该水生中组分听质量以底泥中居多，约占添加稀土总量的９６％以上；进入浮萍中的稀土的添加稀土总量的０．２６－１．６１％之间，水中则在０．５４－０．９１％之间；鲤鱼中的稀土分量虽均在添加稀土总量的０．０３５

A simulation Study on the Accumulation or Added Rare Earth Elements in Aquatic Ecosystem

The accumulation and distribution coefficients of added rare earth elements (RE) in various parts of simulated aquatic ecosystem were investigated. The results showed that concentrations of added RE in bottom mud and water boies varied smoothly and in Lemna minor and Cyprinus carpio varied extremely with the time in the period of experiment. Distribution coefficients of added RE in bottom mud were higher than 96%,in Lemna minnor,were range of 0.26-1.61%,in water,were range of 0.54%-0.91% ; and in carp were less than 0.035%,but almost on linear increment in the period of experiment. Bioconcentration of added RE in carp was also discussed.