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 HNO3-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
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 HNO3- 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
中图分类号:
罗道成, 刘俊峰. 流动注射-分光光度法测定环境水中痕量钍[J]. 工业水处理, 2005, 25(10): 49-51.
Luo Daocheng, Liu Junfeng. Determination of trace thorium in environmental water by flow injection-spectrophotometry[J]. INDUSTRIAL WATER TREATMENT, 2005, 25(10): 49-51.