微量Pt,Pd和Rh的在线分离富集与FAAS测定

提出用VS-Ⅱ型碱性阴离子交换纤维流动注射在线分离富集-火焰原子吸收光谱法(FI-FAAS)测定复杂样品中的Pt,Pd和Rh的分析方法.该方法检测限低,Pt:0.064μg/mL,Pd:0.074 μg/mL,Rh:0.025μg/mL,采样频率大,可用于复杂样品中痕量贵金属的测定.

On-line Separation-preconcentration and FAAS Determination of Trace Pt, Pd and Rh

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.