流动注射在线分离富集-电热原子吸收法测定地球化学样品中的痕量金、铂、钯

Flow injection with electrothermal atomic absorption spectrometry for determination of gold, platinum and palladium in geochemical samples

建立了流动注射在线同时分离富集 ,无火焰原子吸收法测定地球化学样品中金、铂、钯的分析方法。研究了联用技术并进行了吸附条件和解脱条件的优化实验。当采样频率为 2 0样 h时 ,Au、Pt、Pd的富集倍数分别为 43、37、41。Au、Pt、Pd的检出限 ( 3σ)分别为 5、1 6、9ng L。将Au、Pt、Pd质量浓度分别为 5 0、2 0 0、1 0 0ng L的混合标准溶液平行测定 7次 ,求得Au、Pt、Pd的相对标准偏差分别为3 6%、5 .1 %、4.7%。并对国家级标准样品进行了测定 ,其结果及精密度符合要求。

A flow injection on-line per-concentration system was coupled with electrothermal atomic absorption spectrometry for the determination of trace gold, platinum, palladium in geochemical samples. The system was investigated and the experimental conditions were optimized. The enrichment factors for Au, Pt, Pd were 43, 37, 41, respectively. The detection limit(3σ) for Au, Pt, Pd were 5, 16, 9 ng/L, respectively. The RSD of Au, Pt, Pd were 3.6%, 5.1%, 4.7%, respectively. Using the established method, the contents of Au, Pt, Pd in four standard reference materials were determined and the results were found to be in good agreement with the reference values.