Li Weiwei, Ding Kun, Wang Hua, Chen Shiheng, Shen Zheng, Guan Yafeng
Department of Instrumentation and Analytical Chemistry, CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Se Pu. 2011 Feb;29(2):141-5. doi: 10.3724/sp.j.1123.2011.00141.
Nitrogen compounds in gasoline were extracted by liquid-liquid extraction and analyzed by gas chromatography-surface ionization detector (GC-SID). Compared with the chromatograms obtained from GC-flame ionization detector (FID), GC-thermal ionization detector (NPD) and GC-mass spectrometry (MS), the peaks in the chromatogram obtained by GC-SID were assigned to the nitrogen compounds in gasoline. Most of these nitrogen compounds could not be detected by FID or NPD, which demonstrated the high selectivity and sensitivity of the SID. The types of nitrogen compounds in three gasoline samples (90#, 93#, 97#) were similar, but their contents varied with different gasoline brands. The extracted nitrogen compounds were mainly anilines, the amounts of which in the three gasoline samples were different. Trace amounts of several high boiling point nitrogen compounds were successfully detected because of the high sensitivity of SID. The SID is superior to the commercial NPD in detecting the nitrogen compounds in gasoline samples. In view of its high sensitivity and selectivity, the SID is a promising GC detector.
采用液液萃取法提取汽油中的氮化合物，并用气相色谱 - 表面电离检测器（GC - SID）进行分析。与气相色谱 - 火焰离子化检测器（FID）、气相色谱 - 热离子化检测器（NPD）和气相色谱 - 质谱（MS）得到的色谱图相比，GC - SID得到的色谱图中的峰被归属于汽油中的氮化合物。这些氮化合物中的大多数无法被FID或NPD检测到，这表明了SID具有高选择性和高灵敏度。三种汽油样品（90#、93#、97#）中的氮化合物类型相似，但它们的含量因汽油品牌不同而有所变化。提取出的氮化合物主要是苯胺，其在三种汽油样品中的含量不同。由于SID具有高灵敏度，成功检测到了痕量的几种高沸点氮化合物。在检测汽油样品中的氮化合物方面，SID优于商用NPD。鉴于其高灵敏度和高选择性，SID是一种很有前景的气相色谱检测器。
