Investigation of Europium (III)-Rutin Complex in Water-Ethanolic Solution

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Abstract
The composition and the stability constant of Eu(III)-rutin complex were determined by suitable spectrophotometric methods and pH-metric measurements. The formation of a (Eu(C27H26O16H3)2)+ complex whose concentration stability constant β2 ranged from 10.59 at pH=5.0 to 7.21 at pH=8.0, was established. Spectrophotometric determination of Eu(III) by means of the reaction of complex formation with rutin, was investigated. It was found that Eu(III) can be determined in the range from 5×10−6 to 7.5×10−5M. All investigations were carried out with 70% ethanolic solutions at room temperature (20°C), whereas spectrophotometric investigations were performed in the presence of a buffer, at constant pH values and ionic strength (0.015). The determination of the complex composition was done at pH=5.6, and that of Eu(III) at pH=6.3.