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We analyzed both neutral and methylated phenolic fractions using GC/MS [Agilent 6890/5973, with an electron capture negative ionization (ECNI
) ion source (Agilent Technologies, Santa Clara, CA)].
Individual methyl derivatives prepared after methylation of authentic reference standards were injected in the gas chromatograph (GC)/mass spectrometer operated in electron capture negative ionization (ECNI
) full scan mode.
We performed the cleanup procedure with sulfuric acid lipid removal, and quantitative analyses of PBDEs by gas chromatography--mass spectrometry [electron capture negative ion (ECNI
) monitoring, m/z = 79, 81] as previously described in detail for the individual studies (Sjodin et al.
Ionization was performed in electron-capture negative ionization (ECNI
) mode, using methane as reagent gas.
The mass spectrometer was operated in electron capture negative ionization (ECNI
) mode using methane as the buffer gas.