摘要
用Ｆｅ（ＯＨ）３沉淀从１．５—２Ｌ水样中预浓集钍，以硝酸溶解沉淀并蒸干，再分别用氯氟酸和高氯酸蒸干，以除去不溶物和有机杂质，随后用３ｍｏｌ／Ｌ硝酸溶解沉淀，以４％Ｐ２０４－甲苯溶液萃取、５％草酸溶液反萃取，加氯化钙溶液沉淀出草酸钙，离心分离后用５ｍＬ４ｍｏｌ／Ｌ盐酸溶解沉淀，以偶氮胂Ⅲ为显色剂测定其吸光值。本方法的测定下限可达０．０３μｇ／Ｌ，能满足大部分环境水和工业废水中钍浓度测定的要求。
The water sample was precipitated by Fe (OH)3, and the precipitate was dissolved by concentrated HNO3,then the solution was dried by heating.The residue was evaporated with HF and HClO4 seperately to remove the undissolved matters and organic impurities and then the involved was dissolved by 3 mol/L HNO3. After extraction by 4% P204-toluene solution and stripping by 5% H2C2O4, CaCl2 was added to obtain CaC2O4 precipitate. The precipitate was dissolved by 5mL 4mol/L HCl.After that Th was determined by spectrophotometry using arsenazo Ⅲ as developer.The detection limit of this method is 0. 03μg/L. The presented method can meet the requirements for determination of thorium in most natural and industrial water.
出处
《铀矿冶》
CAS
1994年第2期107-111,共5页
Uranium Mining and Metallurgy
