采用能量色散X射线荧光仪测定分子筛中硫酸根离子的含量

建立了采用能量色散X射线荧光仪测定分子筛中硫酸根离子含量的分析方法,考察了所建方法的准确度和精密度。结果表明,在测试介质为空气,工作电压为6 kV,工作电流为200μA,计数时间为180 s,最小ROI为2.198,最大ROI为2.433的测试条件下,工作曲线的线性相关系数为0.999 3;测定20个w(SO24-)为0.13%～1.50%的工业分子筛样品,方法的准确度(绝对误差)为0.01%～0.14%,平均值为0.03%;测定8个w(SO24-)为0.158%～3.321%的标准试样,每个样品测试10次,方法的精密度(相对标准偏差)为0.41%～2.94%。

Determination of sulfate ion content in zeolite by energy-dispersive X-ray fluorescence spectrometer

The analysis method to determine SO24- content in zeolite by energy -dispersive X -ray flu- orescence spectrometer was established, and the ac- curacy and precision of the method were investiga- ted. The results showed that under the condition of air medium, operating voltage 6 kV, electric current 200 A, counting time 180 s, minimum ROI 2. 198, maximum ROI 2.433, the linear correlation coeffi- cient of working curve was 0.999 3, the accuracy （absolute error）of the method ranged from 0.01%to 0. 14% ,its average value was 0. 03% for determi- ning 20 industrial zeolite samples with SO24- mass fraction from 0. 13% to 1.50% , and the precision （ relative standard deviation ） ranged between 0.41% and 2.94% when 8 standard samples with S024- mass fraction from 0. 158% to 3. 321% were repeatedly tested 8 times respectively.