Flow-injection spectrophotometric determination of palladium in catalysts and dental alloys with 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropyl-amino)aniline

Add time:07/22/2019    Source:sciencedirect.com

2-(5-Bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)aniline rapidly forms a water-soluble complex with palladium in an acetate-buffered medium at pH 3.2.The molar absorptivity of the complex is 9.84×104l mol−1 at 612 nm. The calibration graph is linear over the range of 10–100 μg l−1 palladium; the detection limit is 2 μg l−1 and the relative standard deviation is 0.6% for 100 μg l−1 palladium. The sample throughput is 50 h−1. Divalent transition metals (Fe, Ni, Co) do not interfere at levels from 2 to 10 mg l−1. Interference from copper is prevented by adding 10−3 M EDTA solution to the carrier stream. Palladium in solutions of catalysts and dental alloys can be determined selectively, sensitively and rapidly.

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