Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Spectrophotometric Determination of Rhodium(III) and Iridium(III) with 3-Hydroxy-2-methyl-1,4-naphthoquinone 4-Oxime
Kamini ShravahS. K. Sindhwani
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1985 Volume 58 Issue 12 Pages 3560-3562


Rhodium(III) and iridium(III) form 1:3 and 1:2 (metal:ligand) complex, respectively with 3-hydroxy-2-methyl-1,4-naphthoquinone 4-oxime (HMNQM). The complexes are soluble in 20% ethanol. The reagent has been used for the spectrophotometric determination of Rh(III) and Ir(III). The optimum ranges of concentration for the determination of Rh(III) and Ir(III) are 0.27–5.24 and 1.51–15.85 over the pH range 5.0–7.5 and 5.3–8.0, respectively. The Sandell sensitivities for the determination of Rh(III) and Ir(III) are 0.0042 and 0.015 μg cm−2, respectively. The determinations have also been carried out in the presence of foreign ions.

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