某放射性污染区盐生植物对~(137)Cs的吸收研究

植物修复技术适用于大面积、低活度的放射性污染治理,在一些大面积放射性污染区具有潜在的应用前景。本研究在某放射性典型污染区域取样,测量了该区域盐生植物及其生长土壤的137Cs含量,以生物富集系数(BC值)为指标,分析了不同核素土壤分布、K元素含量等因素对BC值的影响。研究结果表明,污染区植物对137Cs的吸收BC值在10-5~10-2数量级之间,多数区域由于核素分布不均匀而引起BC值下降,均匀分布则有利于核素的吸收。另外,BC值还与土壤K元素含量呈负相关。

CAESIUM-137 ACCUMULATION BY HALOPHYTES AT A RADIONUCLIDE CONTAMINATED SITE

Phytoremediation,has been used for cleanup of low-level contaminants,exhibits a great potential in remediation of large-scale radionuclide contamination.An investigation on radionuclide accumulation by native halophytes and its influencing factors,plant variety and parts,soil K content and profile contribution of radionuclide,was carried out for the feasibility of radionuclide phytoremediation at a radionuclide contamination site,in China.The results showed that BC(bioaccumulation coefficient) value of 137Cs by halophytes ranged from 10-5～10-2,BC value in most regions declined with inhomogeneous distribution of 137Cs and enhanced with the homogenous distribution.Significant negative correlation was existed between K concentration and BC value.