Publisher: Bachudo Science Co. Ltd

5 and 4 Dimethylaminobenzylidene) Rhodanine As A Reagent For The Spectrophotometric Determination of Copper and Manganese

E. O. Ojeka, J. F. Iyun
KEYWORDS: 5 and 4 Dimethylaminobenzylidene) Rhodanine As A Reagent For The Spectrophotometric Determination of Copper and Manganese

ABSTRACT:

The synthesis and spectral characteristics of 5(4-dimethylaminobenzylidene)rhodanine have been investigated. The extraction-spectrophotometric method for the determination of copper and manganese based on their extraction into ethanol with 5(4-dimethylaminobenzylidene)rhodanine (DMABR) from a weakly acidic medium have been developed. The .maximum absorbance of the extracted species for Cu and Mn compounds occurs at 480nm.Copper · and manganese compounds react with the reagent in the molar ratio 1 :1; 1 :2;and 1 :3 (metal:ligand) at pH 1.09 to 11 in a  solution containing 20 % (v/v) of ethanol..A concentration of DMABR three times greater 3 than the metal concentration was necessary for complete comRlexation; to give molar extinction coefficient (3.8 x 10 at pH 2 and 7.6 x 10 3 at pH 8) for Cu-DMABR.and (2.76 x10 3 at pH 2 and 1.5 x 10 3 at pH 8) for Mn-DMABR respectively. The interferences with some metal ions have been studied. The optimum experimental conditions were suggested for the determination of these metal ions.   


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