汽油清净剂硫含量的检测方法研究

Study on Determination of Sulfur Content in Gasoline Detergent

汽油清净剂中的高含量氮元素对于紫外荧光法测定硫含量具有明显的干扰影响,采用高氮抑制器可以消除这种干扰影响。本文选取了7种市售汽油清净剂产品,应用紫外荧光检测法(除氮与不除氮模式),分别与氧化燃烧离子色谱法和单波长色散X射线荧光光谱法进行硫含量对比研究。结果表明,使用除氮模式的紫外荧光法能够准确检测汽油清净剂中硫含量,准确度与单波长色散X射线荧光光谱法和氧化燃烧离子色谱法两种方法相近。

High-content nitrogen in gasoline detergent has a strong interference on the determination of sulfur content by the method of ultraviolet flurorescence. The problem could be solved when using high nitrogen suppressor. 7 gasoline detergent samples were selected and tested by three methods including ultraviolet flurorescence(UVF), monochromatic wavelength dispersive X-ray fluorescence(MWXRF) and combustion ion chromatography(CIC). The results showed that the UVF method of nitrogen suppressed was more suitable to determine sulfur content in gasoline detergent. The accuracy of the UVF method of nitrogen suppressed, was similar to those methods of MWXRF and CIC.