Spectrophotometric Determination of Gadolinium(III) With O-Hydroxyhydroqoinonephthalein in Mixed Micelles of N-Hexadecylpyridinilm Chloride and Brij 35

Abstract

A sensitive, simple and selective spectrophotometric method for the determination of gadolinium(III) is proposed using o-hydroxyhydroquinonephthalein(Qnph), by analogy with phenylfl-uorone(Phfl), in the presence of N-hexadecylpyridinium chlo-ride(HPC)-Brij 35 mixed surfactants. The calibration curve is rectilinear in the range of 0 – 16.0 μg per 10 ml at 590 nm with an apparent absorption coefficient(∊) of 1.2 × 10⁵ 1 cm⁻¹ mol⁻¹ and Sandell sensitivity of 0.0013 μg/cm² gado-linium(III).

Key Words:

• Spectrophotometry
• Gadolinium(III)
• o-hydroxy-hydroquinonephthalein
• Mixed micellar media
• N-pyridinium chloride-Brij 35