张琳,张永涛,刘福亮,刘君
Abstract
A method using solid-phase extraction coupled
with gas chromatography/combustion/isotope ratio mass spectrometry (GC/C-IRMS)
for the compound-specific stable carbon isotope analysis of polycyclic aromatic
hydrocarbons in aqueous phase was developed in this study. Parameters for the
efficient extraction of polycyclic aromatic hydrocarbons from water samples
were evaluated by SPE-GC/MS. The results indicated that individual polycyclic
aromatic hydrocarbons in water can be effectively separated from unresolved
complex mixtures by the proposed procedure. The mean recovery of the
purification method for all compounds is > 80 %. The carbon isotope
composition of polycyclic aromatic hydrocarbons can be measured with a standard
deviation of < 1 %, for standard material extracts after purification. No
significant isotopic fractionation was observed during the solid-phase
extraction procedure. These findings indicate that the solidphase
extraction-GC/C-IRMS method is well suited for the compound-specific carbon
isotope analysis of polycyclic aromatic hydrocarbons in aqueous phase and can
be used as a potential tool for the source identification of polycyclic
aromatic hydrocarbons.