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- W1986598178 abstract "Positive ion chemical ionization GC/MS was evaluated for the quantitation of polychlorobiphenyls (PCBs) using 10 or less selected PCB standards. Positive ion chemical ionization MS conditions were found that resulted in the best sensitivity and least fragmentation for the PCBs. The optimal conditions were a source temperature of 100 /sup 0/C and source pressure of 0.6 torr, using 200 eV of energy. Mass spectral and response factor (RF) information was gathered for 137 pure cogeners to evaluate methodology of grouping PCBs by level of chlorination or by clustering according to similar responses for quantitation using 10 or less standards. Positive methane chemical ionization was well-suited for their analysis, since the RF values only varied by a factor of 12 at extremes and the technique was 2-6 times more sensitive than electron impact ionization. It was determined that quantitation by using a standard from each level of chlorination showed an overall mean deviation of 21%. It proved more useful for analysis of environmental samples than the cluster scheme, which required isomer identification for proper classification of the PCB to a cluster. The analysis of a sediment extract spiked with PCB congeners resulted in a 14% +/- 5% deviation between actual concentrationsmore » and measured concentrations using PCB standards at each level of chlorination. 24 references, 6 figures, 6 tables.« less" @default.
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- W1986598178 date "1986-03-01" @default.
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- W1986598178 title "Development of methane positive chemical ionization gas chromatography mass spectrometry procedures to determine polychlorinated biphenyl" @default.
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- W1986598178 doi "https://doi.org/10.1021/ac00294a030" @default.
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