Fe(OH)_3沉淀-TBP萃淋树脂色层分离联合测定环境水中的铀、钍、镭

DETERMINATION OF U, Th, 226Ra IN ENVIRON-MENTAL WATER BY Fe(OH)3 PRECIPITATION-TBP LEVEXTREL RESIN CHROMATOGRAPHY

摘要: 本文研究了环境水中U,Th,~(226)Ra的联合测定方法。本法采用Fe(OH)_3沉淀-TBP萃淋树脂色层分离,偶氮胂Ⅲ分光光度法测定U和Th;BaSO_4-PbSO_4共沉淀法浓集、射气法测定~(226)Ra。U,Th,Ra的回收率分别为92.3±1.7％,93.3±5.5％,95.3±6.6％;U和Th的检测下限为7×10~(-8)g/l,~(226)Ra的检测下限为1.7×10~(-3)Bq/l。

Abstract: A method for the determination of U, Th and 226Ra in environmental water is reported in this paper. Samples are separated by Fe(OH)3 precipitan-tion-TBP levextrel resin chromatography. U and Th are determined by Arsenazo Ⅲ spectrophotornetry. 226Ra is concentrated by co-precipitation with BaSO4-PbSO4 and determined by emanation technique. The recovery rate for U, Th, and Ra are 92.3±1.7%, 93.3±5.5% and 95.3±6.69% respectively. The lower limit of detection for U and This 7×10-8g/l, and for 226Ra is 1.7×10-3Bq/l.