摘要
在EDTA和CTMAB存在下 ,在pH 8 8～ 10 2NH4 Cl NH3 ·H2 O缓冲体系中 ,钍 (Ⅳ )与 3,5 二溴水杨基荧光酮 (3,5 DBSF)形成红紫色多元配合物 ,其最大吸收波长为 5 5 7nm ,表观摩尔吸光系数ε为 2 19× 10 5L·mol-1·cm-1,钍含量在 0～ 7μg·(2 5mL) -1范围内 ,符合比耳定律。经离子交换分离除去干扰离子 ,用本法测定了稀土精矿和寻乌矿中的微量钍。
A method for the determination of Thorium reacting with 3,5-dibromosalicylfluorone, cetyltrimethylammonium bromide and EDTA is proposed. This method is based on the formation of a red-violet colored multicomponent complex in pH 8.8-10.2. The complex has an absorption maximum at 557 nm and its molar absorptivity is 2.19 X 10(5) L.mol(-1) . cm(-1). The Beer Law is obeyed in the concentration range of 0-7 mug.25 mL(-1) for Th(IV). The composition of Th to 3,5-DBSF in the complex is 1:4. All interfering ions may be removed by eluting with 6 mol.L-1 HCl through cation-exchange resin. This method has been used for the determination of Th in Rare-Earth sample ores by ion-exchange separation.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期843-845,共3页
Spectroscopy and Spectral Analysis
