铁-邻二氮菲-曙红离子缔合物显色反应的研究及应用

STUDY ON THE COLOUR REACTION OF IRON(Ⅲ)-1, 10-PHENANTHROLINE- EOSIN ION-ASSOCIATED COMPLEX AND ITS APPLICATION

研究了在聚乙烯醇 -乳化剂 OP混合增溶剂存在下 ,Fe( ) -邻二氮菲 -曙红离子缔合物的显色反应。提出一种测定 Fe( )的新方法 ,并将其应用于高纯稀土钐、铕、钆中痕量铁的测定。离子缔合物的最大吸收波长为 551 nm,表观摩尔吸光系数ε551 =5.4× 1 0 4 。在测定条件下 ,铁含量在 0～ 8μg/2 5ml符合比耳定律。

The colour reaction of iron(Ⅲ) 1, 10 phenanthroline eosin ion associated complex was studied in the presence of polyvinyl alcohol (PVA) and emulsifier OP. Based on this reaction, a new method for determination of iron(Ⅲ) was proposed and applied to the analysis of pure samarium oxide, europium oxide, gadolinium oxide. Its maximum absorption is at 551nm. The apparent molar absorptivity is 5.4×10 4L·mol -1 ·cm -1 . Beer′s law is obeyed in the range of 0~8μg Fe per 25ml.