硅酸盐矿物中低含量元素的电子探针异点分步定量法

以电子探针分析硅酸盐矿物国家标准样品 ,研究了不同分析方法和实验条件对硅酸盐矿物的主量元素和质量分数<2 %的低含量元素的电子探针定量分析精度的影响;结果表明 ,在硅酸盐矿物的电子探针定量分析中 ,在假定不含低含量元素的情况下先用常规实验条件分析主量元素的含量 ,尔后用非常规实验条件异点分析低含量元素的含量 ,并让主量元素参与低含量元素定量计算的ZAF校正 ,可以保证不同含量的被测元素均具有较高的分析精度 ,并称该法为“异点分步定量法”。

Another-site Stepwise Quantitative Method for Minor Elements in Silicate Minerals by EPMA

Effects of analytical method and experiment conditions on the detected precision of major elements and minor elements with less than 2% mass fraction in silicate minerals have been investigated by analyzing a national standard rhodonite with electron probe microanalyzer(EPMA). A new procedure of EPMA to obtain higher precision of detected results for all measured elements is presented. The procedure is as follows: major elements are measured with routine experiment conditions supposing the sample does not contain minor elements, then minor elements are measured at another - site with unconventional experiment conditions of increased electron - beam current and prolonged the counting time, and the major elements take part in the ZAF correction of minor elements in a fixed mode. This method is referred to as "another - site stepwise quantitative method" .