1987 Volume 60 Issue 3 Pages 1135-1139
2-Methyl-1,4-naphthoquinone monoxime (MNQM) forms yellow-colored 1:1 (M:L) complex with palladium(II) and brown-colored 1:2 complex with osmium(VIII) and iridium(III). The complexes are insoluble in water but soluble in 1-butanol. The reagent has been used for the spectrophotometric determination of Pd(II), Os(VIII), and Ir(III). The palladium, osmium, and iridium complexes have maximum absorption at 460, 460, and 450 nm respectively with the sensitivity of 0.012 μg Pd/cm2, 0.025 μg Os/cm2, and 0.014 μg Ir/cm2 for logIo⁄I=0.001. The optimum concentration ranges for the determination of Pd(II), Os(VIII), and Ir(III) are 1.58–10.47, 3.02–23.99, and 1.6–11.5 ppm over the pH range 6.5–7.8, 6.5–7.7, and 5.9–7.3 respectively. The determinations have also been carried out in the presence of foreign ions. MNQM reacts with palladium(II) or osmium(VIII) or iridium(III) to form yellow- or brown-colored precipitates which are extractable in 1-butanol. These systems have been studied spectrophotometrically to determine the composition and other physical constants of the complexes. The possibility of determining Pd(II) or Os(VIII) or Ir(III) in presence of diverse ions has also been investigated. Palladium(II) and osmium(VIII) have been successfully determined in synthetic solutions corresponding to the alloys.
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