Determination of ruthenium(III) in the presence of micellar medium by derivative spectrophotometric technique


Chem. Met. Alloys 5 (2012) 42-49




A sensitive spectrophotometric method has been developed for the determination of ruthenium(III) using 3,5‑dimethoxy‑4‑hydroxybenzaldehyde isonicotinoylhydrazone (DMHBIH) in presence of neutral miceller medium of Triton X‑100. The metal ion forms a brownish yellow coloured water soluble complex with the DMHBIH reagent in acidic buffer pH 4.25. Spectral data shows the formation of an 1:1 (M:L) complex with a stability constant 1.82 × 106. Beers law is obeyed over a concentration range of 0.202 to 4.043 μg/mL of Ru(III) at 390 nm. The molar absorptivity and Sandells sensitivity are calculated to be 1.7 × 104 L.mol‑‑1 and 0.006 μ‑2 Ru(III) respectively. The developed derivative spectrophotometric method was employed for the determination of Ru(III) in synthetic alloy samples and real water samples. The effect of various diverse ions has also been studied.



Typical Zero order Absorption Spectra of Ru(III)-DMHBIH complex Vs Reagent as blank



Derivative spectrophotometry / Ruthenium(III) / 3,5-dimethoxy-4-hydroxybenzaldehyde isonicotinoylhydrazone (DMHBIH) / Synthetic alloy samples / Real water samples