X射线荧光光谱分析中不同价态硫对测定硫的影响及地质试样中全硫的测定

Determination of Sul fur in Geological Samples by X-Ray Fluorescence Spectrometry

研究工作表明在粉未压片试样中，由于不同价态的硫所发射的Ｘ射线谱（ＳＫα和ＳＫβ）发生位移，Ｋα／Ｋβ谱线强度比不一致；以及粉未压片－ＸＲＦ测定硫的结果随保存时间的增长发生变化，导致了分析地质试样中全硫时的测定误差。提出采用熔融粉末压片法制样，试样中硫全部转化为硫酸盐硫，克服了谱线位移和试样不稳定问题，提高了全硫分析结果的准确性。

t was shown that the valence state of sulfur has an important effect on the X-ray lines(Kαand Kβ)emitted bv sulfur and causes a drift of the peak positions.The intensitv ratio Kα/Kβ ofsulfide sulfur is different from that of the sulfate. This explanes why the total sulfur values ob-tained by the ordinary XRF spectrometry show a variation with the increase in the time of preser-vation of the powder pellets.It was proposed that instead of the use of the ordinary powder pelletmethod,the sample is prepared through a fusion-crushing-briquetting procedure to convert allvalences of sulfur to the sulfate form,The above method removes the peak drift and improves theaccuracv of the determination of total sulfur.