【摘要】 <正> 采用热表面电离质谱计,对以Li₃PO₄作为加载物的⁶Li⁺,⁷Li⁺锂离子流之比进行了测定。在详细研究分析时的试样酸度、离化带温度、蒸发带温度与试样量,以及测量值随时间的变化等一系列测试条件后,建立了一种高精密度锂同位素分析方法。该法测量锂同位素丰度之比的相对标准偏差优于0.1％,最好时可达0.047％。并具有制样简单、分析时间更多还原

【Abstract】 A method was studied for determining the ratio of 6Li+, 7Li+ ion currents emitted from Li3PO4 as a material loaded by thermal surface ionization mass spec-trometry. The effects of analysis conditions, such as the sample acidity, the ionizing filament temperature, the vaporized sample filament temperature, the quantity of sample loaded and the ratio versus time were studied. A high precision lithium iso- tope analysis procedure was established. Using the procedure, the related standard deviation of lithium isotope ratio is better than 0. 1% , and the best is up to 0. 047%. The procedure has the advantages of simplicity of sample making, short time of analysis, no significant effects on the mass fractionation.更多还原