基于GC/Q-TOF MS技术鉴定S-zorb汽油中噻吩类化合物

结合气相色谱分离技术和MS/MS串联质谱筛查技术,通过选定目标母离子进行碰撞诱导解离,获取精确质量子离子信息,实现汽油馏分中噻吩类化合物的痕量筛查分析。选取5种不同碳数取代噻吩类化合物作为标准物绘制定量标准曲线,建立了基于气相色谱-四极杆串联飞行时间质谱(GC/Q-TOF M S)直接测定汽油中噻吩类化合物的方法。利用该方法研究了S-Zorb汽油中噻吩类化合物(TPs)的脱除规律。结果表明,S-zorb汽油噻吩类化合物的脱除难易程度与其取代基的位置有关,2-甲基噻吩相比3-甲基噻吩更难脱除,2,5-二甲基噻吩、2,3,5-三甲基噻吩分别为C2-TPs和C3-TPs的主要剩余噻吩类化合物。

Identification of thiophenes in S-zorb gasoline by GC/Q-TOF MS

Combined with gas chromatography separation and tandem mass spectrometry screening technology,the target parent ions were selected for collision induced dissociation to obtain accurate ion fragments,which achieved trace screening of the thiophene compounds in gasoline fractions.Quantitative standard curves were drawn according to five characteristic thiophene compounds and the direct analysis method of thiophenes(TPs)in S-zorb gasoline by GC/Q-TOF MS was established.The method was utilized to identify the TPs and the removal rule of them in S-zorb gasoline.The results showed that thiophene with methyl on 2-position was more difficult to be removed than the one with methyl on 3-position.The 2-,5-two methyl substituent groups and thiophenes with methyl substituent groups on 2-,3-,5-position are the main remainiong thiophene compounds of C2-TPs and C3-Tps.