Abstract: The technique of the flow injection on-line separation and preconcentration with VS-Ⅱ type anion exchange fabric combined with flame atomic absorption spectrometry was used to determine the trace elements Pt , Pd , and Rh in complicated samples. The analyzed solution with acidity 3﹪(HCL) passed through the column at a flow rate of 4.8mL／min , the enrichment time was 40 s , Pt , Pd , and Rh on the column was eluted with thiourea at a flow rate of 2.0mL／min , and introduced into the nebulizer system of FAAS. The detection limit is 0.064 μg／mL for Pt , 0.074 μg／mL for Pd and 0.025 μg／mL for Rh , the relative standard deviation(n＝6) is less than 3﹪ , at least 55 samples can be analyzed in an hour. The method has been applied to determining trace Pt , Pd , and Rh in complicated samples with satisfactory results.

Key words: Pt, Pd, Rh, FI-FAAS, complicated sample