Spectrophotometric Studies of Yttrium (III) Complexes with Solochrome Cyanine-R and Eriochrome Azurol-B.

Department of chemistry, Nagpur University, Napur

Manuscript received 20 July 1972; revised 14 May 1973; accepted O. August 1973

Solochrome Cyanine R (SCR) and Eriochrome Azurol B (ECAB) have been recommended as sensitive reagents for the spectrophotometric determination of yttrium (Ill) in aqueous solution. The composition has been found to be 1 : 1 and 1 : 2 (metal : reagent) for Y (III)-SCR and Y (III) ­ECAB chelates respectively. The stability constants of the chelates have been determined by Job's method and limiting logarithmic method, at four different fixed values of 'ionic strength. The value of thermodynamic stability constant of the chelates have been determined to be 5.0± 0.2 for Y(III)-SCR chelate and 9.6 ±0.2 for Y (III)-ECAB chelate respectively. The study also includes the analytical applications of the chelates.