测定汽油中硅含量的单波长色散X-射线荧光光谱法与电感耦合等离子体发射光谱法比对

Comparison of Determination of Silicon Content in Gasoline by Single Wavelength Dispersive X-Ray Fluorescence Spectrometry and Inductively Coupled Plasma Optical Emission Spectrometry

建立了单波长色散X-射线荧光光谱法（MWDXRF）测定汽油中硅含量的方法，并与国标ICP-OES方法进行了对比，考察了MWDXRF方法的准确性、重复性和加标回收率以及不同标准溶液对MWDXRF方法结果的影响。结果表明，在硅含量很低的情况下，采用MWDXRF方法得出的结果会比ICP-OES方法得出的结果偏大，随着硅浓度的不断增大，两种方法之间的结果差异也越来越小，且采用不同类型的标准溶液进行MWDXRF方法分析得出的结果并无明显差异。MWDXRF方法的相对标准偏差〈5．O％，加标回收率在101．O％～118．2％之间，结果准确可靠，适用于硅含量浓度为0～250．0mg／kg范围内的汽油样品。

Methods for the determination of silicon content in gasoline by monochromatic wavelength dispersive X-ray fluorescence spectrometry （MWDXRF）was established with comparing with national standard ICP-OES.The accuracy, reproducibility and re- covery rate of MWDXRF and the effect of different standard solutions on the results of MWDXRF were investigated.The results show that under the condition of low silicon content, the results obtained by MWDXRF are larger than those obtained by ICP- OES,with the increasing of silicon concentration,the difference between the two methods was getting smaller and smaller, and the results of MWDXRF were not different by different standard solutions.The recovery rate of MWDXRF was respectively 101.0% 118.2% with relative standard deviation was less than 5.0%.The method was accurate, reliable and suitable for the determination of silicon content in gasoline samples with a concentration of 0- 250.0 mg/kg.