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本文探讨了用ICP样品直接插入法分析高温合金车削样品中痕量易挥发元素。通过对信背比(S/B)的考查,确定了射频功率、观测高度及石墨杯在等离子体中的位置等ICP最佳操作参数。由于高温合金中的易挥发元素与基体元素两者蒸发行为差异较大,因此,通过对实验条件的控制,使痕量的铅、铋、锌、镉和铊等易挥发元素从基体中选择性地蒸发出来。实验利用了固体样品和溶液样品“发射强度一发射时间”总积分相同的特点,实现了用多元素标准溶液作固体样品分析的标准。实验得出结论,使高温合金车削样品中痕量易挥发元素的分析完全脱离化学标准是完全可以实现的。此方法的检测比常规的ICP溶液进样法低2～3个数量级。
This article discusses the use of ICP sample insertion method for the analysis of superalloy turning samples trace volatile elements. Based on the S / B test, the best operating parameters of ICP, such as the RF power, the observation height and the position of the graphite cup in the plasma, were determined. Due to the large difference in evaporation behavior between the volatile elements and the matrix elements in the superalloy, trace amounts of volatile elements such as lead, bismuth, zinc, cadmium and thallium are selectively removed from the matrix by controlling the experimental conditions Evaporated out. The experiments utilized the same characteristics of the total integral of “emission intensity and emission time” of solid sample and solution sample, and realized the standard of multi-element standard solution for solid sample analysis. The experiment concluded that it is totally possible to completely separate the analysis of trace volatile elements in the superalloy turning samples from the chemical standard. The detection of this method is 2 to 3 orders of magnitude lower than the conventional ICP solution injection method.