等离子体质谱测定岩石标准物质中痕量元素——对某些元素定值的探讨

Precise Determination of Trace Element in Standard Reference Rock Sample by ICPMS Discussion on the Recommended Values for Some Trace Elements

用等离子体质谱（ＩＣＰＭＳ）对美国玄武岩标准物质ＢＨＶＯ１、Ｗ２和中国玄武岩标准物质ＧＢＷ０７１０５（ＧＳＲ３）进行了３９种痕量元素分析。三个标准物质的绝大多数元素测定值与标准值在误差范围内一致。ＧＳＲ３中Ｃｓ、Ｐｂ、Ｙ、Ｎｂ、Ｔｍ、Ｙｂ等元素的ＩＣＰＭＳ测定值与标准值存在不同程度的偏差。用同位素稀释法对ＧＳＲ３中的Ｐｂ做了进一步的精确测定，结合玄武岩的元素地球化学分析，认为ＧＳＲ３标准物质中上述元素的标准值有必要做进一步的分析工作和修正。

The concentrations of 39 trace elements for two USGS standard basalt samples (BHVO1 and W2) and one Chinese national standard basalt sample GBW 07105 (GSR3) have been precisely determined by ICPMS. The detected values for most trace elements in these standard rock samples are in good agreement with the published recommended values. The analytical results for some trace elements including Y, Cs, Pb, Nb, Tm and Yb, however, differ variably from the recommended values in GSR3. Pb concentration in GSR3 was also determined by isotope dilution method. Based on the trace element geochemical behavior, especially some unique trace element ratios for alkaline basalts, we consider that results by ICPMS for the above elements are more reliable than those of published recommended values. It is suggested that further determination and correction for the recommended values of some trace elements in GSR3 be needed.