Determination of palladium,platinum, and rhodium by HPLC with online column enrichment using 4-carboxylphenyl-thiorhodanine as a precolumn derivatization reagent |
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Authors: | H Lin Z J Huang Q Hu G Yang G Zhang |
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Institution: | (1) Department of Chemistry, Yunnan University, Kunming, 650091, China;(2) Guangzhou Institute of Geochemistry, China Academy of Sciences, Guangzhou, 510640, China |
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Abstract: | In the present work, 4-carboxylphenyl-thiorhodanine (CPTR) was synthesized. A new method for the simultaneous determination
of palladium, platinum, and rhodium ions as metal-CPTR chelates was developed using rapid column high-performance liquid chromatography
equipped with an online enrichment capability. Palladium, platinum, and rhodium ions were precolumn-derivatized with CPTR
to form colored chelates. The Pd-CPTR, Pt-CPTR, and Rh-CPTR chelates can absorbed onto the front of the enrichment column
(ZORBAX Stable Bound, 4.6 × 10 mm, 1.8 μm) when they are injected with a buffer solution of 0.05 M sodium acetate-acetic acid
(pH 3.5) as mobile phase. After the enrichment had finished, by switching the six-port switching valve, the retained chelates
were back-flushed by mobile phase and moved towards the analytical column. The chelate separation on the analytical column
(ZORBAX Stable Bound, 4.6 × 50 mm, 1.8 μm) was achieved with 46% acetonitrile (containing 0.05 M of pH 3.5 sodium acetate-acetic
acid buffer and 0.01 M tritonX-100) as mobile phase. The palladium, platinum, and rhodium were separated completely within
2 min. The detection limits (S/N = 3) of palladium, platinum, and rhodium are 1.4, 1.6, and 2.0 ng/L, respectively. The method was applied to the determination
of palladium, platinum, and rhodium in water, urine, and soil samples with good results.
The text was submitted by the authors in English. |
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