ビオルル酸とゼフィラミンによるコバルトの抽出吸光光度定量

The Extraction Spectrophotometric Determination of Cobalt with Violuric acid and Zephiramine

Creators Matsusaki Koji

The extraction spectrophotometric determination of cobalt with violuric acid and zephiramine has been investigated. The cobalt-violuric acid-zephiramine complex can be extracted into chloroform. The complex extracted into organic layer has an absorption maximum at 372nm. An aqueous cobalt solution was transferred to a 100ml separation funnel, and 5ml of 4×(10)^<-3> M violuric acid was added. The pH was adjusted to between 7.5 and 8.5 with H_3BO_4-KCl-Na_2B_4O_7 buffer, and the volume was made up to 50ml with water. After 30 minutes, 3ml of 5×(10)^<-2> M zephiramine was added, and the solution was shaken for 3 minutes with 10ml of chloroform. The organic phase was dried over anhydorous Na_2SO_4,and the absorbance was measured at 372nm against reagent blank. Beer's law is obeyed up to 12μg cobalt per 10ml of chloroform. The moler absorptivity of the complex is 2.1×(10)^<-5> (cm)^<-1>・(mol)^<-1>・l at 372nm. The moler ratio of cobalt to violuric acid in the extracted species was estimated to be 1 : 3 by the continous variation method.

[ISSN]0372-7661

[NCID]AN00244228