MASS SPECTROMETRIC IONIZATION PATTERN OF 209 POLYCHLORINATED BIPHENYLS

摘要：

Electron impact (EI) and electron capture negative ionization (ECNI) mass spectra of 209 polychlorinated biphenyls (PCBs) were obtained. With increasing level of chlorine substitution, PCB total ion responses decreased upon EI and dramatically increased upon ECNI. M+ and M-nCl+ are major ions for EI. For ECNI, Cl- is major ions for lighter congeners, while M- and M-nCl- for heavier ones, with large variation of relative abundance in the same homolog. Fragmentation patterns are different for congeners within the same homolog under both EI and ECNI. Ortho-substituted PCBs tend to have a higher M-nCl+ abundance upon EI and Cl- abundance upon ECNI than their meta and para counterparts. PCB ionization upon ECNI was strongly dependent of ion source temperature. Higher source temperature facilitated the fragmentation, causing lower molecular and higher Cl- abundances.

作者: Wei H Li A

作者单位: School of Public Health,University of Illinois at Chicago,Chicago,Illinois 60612,USA

会议类型: 国际会议

会议名称: 29th International Symposium on Halogenated Persistent Organic Pollutants(第29届国际持久性有机污染物研讨会)(2009国际二噁英大会)

会议地点: 北京

会议语种:英文

页码: 1-6

在线出版日期: 2009-08-24（万方平台首次上网日期，不代表论文的发表时间）