Vol. 7, Issue 1 (2018)

Author(s):
GW Belsare and SG Badne

Abstract:
The tripositive rare earth metal ions exhibit little tendency to form complexes with variety of normally powerful coordinating agents. Although this may be due to relatively large size of their cations. With the development of cheletometry in this context many new reagents have been introduced for the determination of rare earths in the recent past. In the present work the Cetyldimethyl ethyl ammonium bromide has been used to sensitize Pyrogallol Red (PGR) for the photometric determination of Y(III), Eu(III) and Tb (III). Cetyldimethylethyl ammonium bromide (CDMEAB), a cationic surfactant has been used to decolorized Pyrogallol Red(PGR), an anionic triphenyl methane dye. Addition of Y(III), Eu(III) and Tb (III) to this decolourized solution resulted into intense coloured stable ternary complex. The shift in the λmax with increased in the values of molar absorptivity and sensitivity have been observed in case of ternary complex(Y(III), Eu(III) and Tb (III)-PGR-CDMEAB) as compared to binary complex(Y(III), Eu(III) and Tb (III)-PGR). The analytical applications like Beer’s law range and effective photometric range have been studied at pH 6.0 and at 550nm in absence and at 650nm in presence of CDMEAB.