Spectrophotometric determination of rhodium(III) with butaperazine dimaleinate

TLDR: Rhodium(III) forms an orange-red 1 : 1 complex with butaperazine dimaleinate at room temperature in sodium acetate-hydrochloric acid buffer solution containing copper(II) sulphate and ascorbic acid.

Abstract: Rhodium(III) forms an orange-red 1 : 1 complex with butaperazine dimaleinate at room temperature in sodium acetate-hydrochloric acid buffer solution containing copper(II) sulphate and ascorbic acid. The orange-red complex exhibits an absorption maximum at 465 nm. Beer's law is obeyed for 0.2–28 µg ml–1 of rhodium. Sandell's sensitivity of the reaction is 0.042 µg cm–2 and the molar absorptivity is 2.44 × 103 l mol–1 cm–1. The tolerance limits of platinum metals, base metals and common anions are reported.