吹样法中样品蒸发的蒸气压效应

Vapour Pressure Effect of Sample Evaporation in Blowing Powder Sample into Arc Discharge

作者根据多年来从事吹样法光谱分析的经验 ,对不同挥发性元素该方法同时具有的高灵敏度 ,提出了理论解释 。

Vapour pressure effect of sample evaporation in blowing powder sample into arc discharge is described in this paper. Since vapour pressure of basic composition of sample in arc is very high, evaporation of this basic composition will be reduced greatly, and the evaporation of impurity elements in the sample are stronger than basic composition, because vapour pressure of impurity elements in arc are lower than the basic composition. This effect is characteristic in sample evaporation during blowing powder sample into arc source. Determination limit of this method is therefore lowered due to the existence of this effect.