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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- 作者：Z. Chen ; B. Li ; M. Miao ; G. Yang ; J. Yin and Q. Su
- 关键词：Key words ; Palladium ; platinum ; rhodium ; 4 ; hydroxy ; 1 ; naphthalthiorhodanine ; rapid column high performance liquid chromatography ; on ; line enrichment.
- 刊名：Microchimica Acta
- 出版时间：November 2005
- 出版年：2005
- 期刊代码：95_0026-3672
- 类别：ch
- 卷：152
- 期：1-2
- 页码：93-97
- 数据来源：sp
摘要
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 脳 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 脳 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.