Flow-injection spectrophotometric determination of palladium in catalysts and dental alloys with 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropyl-amino)aniline |
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Authors: | Tadao Sakai Norko Ohno |
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Affiliation: | Department of Chemistry, Asahi University, 1851 Hozumi, Hozumi-cho, Gifu 501-02 Japan |
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Abstract: | 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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