P204萃取和盐酸反萃取对土壤中钇的分离研究

Study on the extraction and backextraction of yttrium in soil simulated samples by P204 extractant and HCL backextractant

本研究确立土壤中钇元素的分离条件,为后续的放射性同位素分析奠定基础。通过P204萃取剂制备有机相,优化模拟土壤浸取液中钇的萃取与反萃取条件,以提取和纯化土壤浸取液中的放射性同位素^(90)Y。实验结果表明,P204溶剂萃取法在以下条件下提取土壤浸取液中的^(90)Y效果最佳:使用10%(体积分数)P204萃取剂,有机相与水相的体积比为1.5∶1,浸取液的酸度调节至pH=2.5,萃取温度为25℃,萃取时间为25 min。完成萃取后采用7 mol·L^(-1)盐酸进行反萃取,反萃取在常温25℃下进行,时间为25 min。该方法有效缩短90Sr分析过程中子体^(90)Y的提纯时间,为环境土壤样品中90Sr的分析提供一种高效的分离方法。

In this study,the separation conditions of yttrium element in soil were established,laying the foundation for subsequent radioactive isotope analysis.Organic phase using P204 extractant,optimization of extraction and back extraction conditions for yttrium in simulated soil leachate were prepared,to extract and purify radioactive isotope^(90)Y from soil leachate.The experimental results showed that the P204 solvent extraction method had the best effect on extracting^(90)Y from soil leachate under the following conditions:using 10%(volume fraction)P204 extractant,the volume ratio of organic phase to water phase was 1.5∶1,the acidity of the leachate was adjusted to pH 2.5,the extraction temperature was maintained at room temperature of 25℃,and the extraction time was 25 min.After completion of extraction,7 mol·L^(-1)hydrochloric acid was used for back extraction,which was also carried out at room temperature of 25℃for 25 minutes.This method effectively shortens the purification time of neutron^(90)Y in the 90Sr analysis process,providing an efficient separation method for the analysis of 90Sr in environmental soil samples.