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Title: Differentiation of isomeric polyaromatic hydrocarbons by electrospray Ag(I) cationization mass spectrometry
Authors: Ng, KM
Ma, NL
Tsang, CW
Issue Date: 2003
Publisher: John Wiley & Sons
Source: Rapid communications in mass spectrometry, 2003, v. 17, no. 18, p. 2082-2088 How to cite?
Journal: Rapid communications in mass spectrometry 
Abstract: Abundant Ag(I)-cationized complexes of 13 polyaromatic hydrocarbons (PAHs), [Ag+PAH]+ and [Ag+2(PAH)]+, were readily generated by electrospray ionization (ESI). In-source collision-induced dissociation (CID) of the [Ag+2(PAH)]+ complex yielded the monomer complex [Ag+PAH] +, which fragmented further to yield the radical molecular ion [PAH]+. Based on significant differences in relative intensities of [Ag+2(PAH)]+, [Ag+PAH]+ and [PAH]+, isomeric PAHs can be differentiated. The [PAH]+/[Ag+PAH]+ ion intensity ratio was found to increase with decreasing ionization potentials (IPs) of PAHs. The ratio was significantly different for the isomeric PAHs studied over a wide range of PAH concentrations (1.6-100 nmol/mL), and showed good measurement reproducibility; the coefficient of variation of inter-day measurements was in the range 3-12% for four representative PAHs (n = 5). Detection limits for phenanthrene, pyrene, chrysene and benzo[a]pyrene, in the form of the monomer complexes [107AG+PAH]+ and measured in the selected-ion monitoring (SIM) mode, were 0.31, 0.63, 0.16 and 1.25 pmol/5 μL injection, respectively (S/N ratio ∼2-3).
ISSN: 0951-4198
EISSN: 1097-0231
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