Simultaneous Determination of Palladium, Platinum and Rhodium by On-Line Column Enrichment and HPLC with 4-Hydroxy-1-Naphthalthiorhodanine as Pre-Column Derivatization Reagents |
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Authors: | Z Chen B Li M Miao G Yang J Yin Q Su |
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Institution: | (1) Department of Chemistry, Yunnan University, 650091 Kunming, P.R. China;(2) School of Chemistry & Material Science, Chinese University of Science and Technology, 230026 Hefei, P.R. China;(3) Key Laboratory of Chemistry & Engineering, Yunnan Academy of Tobacco Science, 650106 Kunming, P.R. China |
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Abstract: | In this paper, 4-hydroxy-1-naphthalthiorhodanine (HNTR) was synthesized, and a new method for the simultaneous determination
of palladium, platinum and rhodium ions as metal-HNTR chelates was developed using rapid column high-performance liquid chromatography
combined with on-line enrichment. The palladium, platinum and rhodium ions were pre-column derivatized with HNTR to form colored
chelates. The Pb-HNTR, Pt-HNTR and Rh-HNTR chelates could be absorbed onto the front of the enrichment column when they were
injected into the injector and sent to the enrichment column ZORBAX Stable Bound, 4.6 × 10 mm, 1.8 μm] with a buffer solution
of 0.05 mol L−1 sodium acetate-acetic acid (pH 4.0) as mobile phase. After enrichment, and by switching the six-ports switching valve, the
retained chelates were back-flushed by mobile phase and traveling towards the analytical column. Separation of these chelates
on the analytical column ZORBAX Stable Bound, 4.6 × 50 mm, 1.8 μm] was satisfactory with 68% acetonitrile (containing 0.05 mol L−1 of pH 4.0 sodium acetate-acetic acid buffer salt and 0.1% of tritonX-100) as mobile phase. Palladium, platinum and rhodium
were separated completely within 2 min. The detection limits (S/N = 3) of palladium, platinum and rhodium are 1.2 ng L−1, 1.5 ng L−1 and 1.8 ng L−1, respectively. This method was applied to the determination of palladium, platinum and rhodium in water, urine and soil samples
with good results. |
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Keywords: | : Palladium platinum rhodium 4-hydroxy-1-naphthalthiorhodanine rapid column high performance liquid chromatography on-line enrichment |
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