Spectrophotometric determination of rhodium(III) with butaperazine dimaleinate

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.