Abstract
Two sensitive, precise spectrophotometric methods for the determination of rhodium with malachite green are proposed. The anionic rhodium complex with tin(II) chloride yields an ion associate with malachite green; on shaking the solution (in 6.5 M HCl) with benzene, the sparingly soluble ion associate (rhodium: malachite green =1:2) precipitates at the phase boundary. The precipitate is dissolved in a mixture of acetone and water (3 + 1). The molar absorptivity is 1.44 × 10 5 l mol l-1 cm -1 at 627 nm. When test solutions (0.65 M HCl) are shaken with diisopropyl ether, an ion associate of a different composition is formed (rhodium :malachite green = 1:5) and the molar absorptivity is 3.4 × 10 5 l mol -1 cm -1. Platinum, palladium and iridium interfere except in small amounts.
Published Version
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