论文部分内容阅读
环境样品中放射性锶的测定存在着从大量钙中分离和纯化锶的困难。本文研究中应用的主要原理是建立在利用EDTA对钙的选择螯合作用大于锶而进行的阳离子交换分离的基础上。碱土金属从样品中分离后,溶解于1.2M的盐酸中,并加入等效量的EDTA。将溶液的pH调到5.1,以每分钟20毫升的流速通过Dowex 50W-X8离子交换柱。保留在树脂上的部分钙,用pH为5.1的2%EDTA溶液1.8升洗提出来。然后用450毫升2M盐酸洗提锶。沉淀碳酸锶,并测定化学产额。静置14天待~(90)Sr-~(90)y达到放射性平衡后,测量~(89)Sr+~(90)Sr+~(90)y的
Determination of radioactive strontium in environmental samples There is a difficulty in separating and purifying strontium from large amounts of calcium. The main principle used in this study is based on the cation-exchange separation of EDTA with a calcium chelation greater than that of strontium. After the alkaline earth metal is separated from the sample, it is dissolved in 1.2 M hydrochloric acid and an equivalent amount of EDTA is added. The pH of the solution was adjusted to 5.1 and passed through a Dowex 50W-X8 ion exchange column at a flow rate of 20 ml per minute. Part of the calcium retained on the resin was eluted with 1.8 liters of a 2% EDTA solution of pH 5.1. Strontium was then eluted with 450 ml of 2 M hydrochloric acid. Strontium carbonate was precipitated and the chemical yield was determined. After standing for 14 days until ~ (90) Sr- ~ (90) y reaches the radioactive equilibrium, the content of ~ (89) Sr + ~ (90) Sr + ~