固相萃取片法分析环境水中的~(90)Sr

对美国3M公司的锶特效固相萃取片(EmporeTMStrontium Rad Disk)分离水溶液中锶离子的性能进行了系统研究,包括酸度、流速、样品体积对吸附百分比的影响,吸附容量的测定,137 Cs和99 Tc在萃取片上的吸附情况等,并对萃取片上90Sr的解吸及片上90Sr的放射性测量进行了研究。在此基础上,给出了萃取片法分析环境水中90Sr的推荐程序。样品体积为1L,液闪测量时间为1h时,分析程序的最小可探测活度浓度为0.033Bq/L。最后应用一些实际环境水样对该程序进行了检验。

Determination of 90 Sr in Environmental Water Using EmporeTM Strontium Rad Disk

The performance of Empore^TM Strontium Rad Disk produced by 3M Corporation for the separation of strontium in aqueous solution was studied elaborately. The influences of sample acidity, volume and flow rate on strontium uptake efficiency were studied and maximum strontium capacity was determined. The adsorption behavior of ¹³⁷Cs and ⁹⁹Tc on the disk was investigated as well as the elution method of strontium and counting method of ⁹⁰Sr on the disk. Based on the results, an analysis procedure of ⁹⁰Sr in environmental water sample using SPE disks was presented. The minimum detectable activity is 0.033 Bq/L with a sample volume of 1 L and a detection time of 1 h. Finally, some ⁹⁰Sr spiked environmental water samples were determined to testify the procedure.