Simultaneous determination of palladium, platinum and rhodium by on-line column enrichment and HPLC with 2,4-dihydroxybenzylidenethiorhodanine as pre-column derivatization reagent

Journal of the Brazilian Chemical Society

Yang, Guangyu¹  Hu, Qiufen¹  Yunnan Institute of the Nationalities, China¹  Dong, Xuechang¹  Han, Yong¹  Chen, Jing¹  Yunnan University, Kunming¹ 

关键词: palladium;    platinum;    rhodium;    2;    4-dihydroxybenzylidenethiorhodanine;    high performance liquid chromatography;    on-line enrichment;   

DOI  :  10.1590/S0103-50532006000100027

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

A new method for the simultaneous determination of palladium, platinum and rhodium ions as metal-DHBTR chelates was developed. The palladium, platinum and rhodium ions were pre-column derivatized with 2,4-dihydroxybenzylidenethiorhodanine (DHBTR) to form colored chelates. The Pd-DHBTR, Pt-DHBTR and Rh-DHBTR chelates can be absorbed onto the front of the enrichment column when they were injected into the injector and sent to the enrichment column with a 0.05 mol L-1 sodium acetate-acetic acid buffer solution (pH 3.5) as mobile phase. After the enrichment had finished, by switching the six ports switching valve, the retained chelates were back-flushed by mobile phase and traveling towards the analytical column. These chelates separation on the analytical column was satisfactory with 62% (v/v) acetonitrile (containing 0.05 mol L-1 of pH 3.5 sodium acetate-acetic acid buffer salt and 0.1% (m/v) of tritonX-100) as mobile phase. The Limits of detection of palladium, platinum and rhodium are 3.6 ng L-1, 3.2 ng L-1 and 4.5 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.

【 授权许可】

Unknown