Abstract:

The anion exchange resin separation and preconcentration is carried on by using flowinjection technique.Th（Ⅳ）reacts with Cl- to form an anion complex，and is separated and preconcentrated by anion exchange resin.The anion complex is desorbed with a solution of 0.25 mol /L HNO_3- 1.5% citric acid and is determined by spectrophotometry with FAsA- Ⅲ. The maximum absorption wavelength is 656 nm. The mass concentration of thorium accords with Beer′s Law in the range of 0 - 700 μg/L. The detection limit of this method is 1.0 μg/L.The sensitivity of the determination of the thorium after separation and preconcentration can be improved by several times，and the co-ions in quantity do not distrub the determination of thorium.

Key words: flow injection, separation and preconcentration, spectrophotometry, thorium

摘要：

研究了采用流动注射技术进行痕量钍的阴离子分离富集在0.30 mol/L HCl介质中，Th(Ⅳ)与Cl-形成络阴离子，被阴离子交换树脂分离富集,用0.25 mol/L HNO_3-质量分数1.5%柠檬酸溶液洗脱，用偶氮氟胂-Ⅲ(FAsA-Ⅲ)分光光度法测定。有色络合物的最大吸收波长为656 nm，钍的质量浓度在0￣700μg/L范围内符合比耳定律，方法的检出限为1.0μg/L。经分离后钍的测定灵敏度可提高数倍，大量共存离子不干扰钍的测定。

关键词: 流动注射, 分离富集, 分光光度法, 钍

CLC Number: 

• O657.32