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Universal and discriminative detection using a miniaturized pulsed discharge detector in comprehensive two‐dimensional GC
Author(s) -
Winniford Bill L.,
Sun Kefu,
Griffith James F.,
Luong Jim C.
Publication year - 2006
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200500502
Subject(s) - flame ionization detector , detector , helium ionization detector , gas chromatography , analytical chemistry (journal) , chemistry , ionization , discharge ionization detector , hydrocarbon , pyrolysis , chromatography , optics , physics , organic chemistry , ion
A miniaturized pulsed discharge detector (Mini‐PDD) has been successfully demonstrated for comprehensive 2‐D GC (GC×GC) analysis of pyrolysis gasoline and the pyrolysis GC×GC analysis of a polyethylene copolymer. The detector cell volume of the Mini‐PDD is reduced to 25% of the Valco plug‐in PDD D‐3. An n ‐C 11 peak width at base is 96 ms for the Mini‐PDD, about 23% larger than a peak width of 78 ms detected by a flame ionization detector (FID). The Mini‐PDD has sufficient response time for most GC×GC applications. When Mini‐PDD is operated in helium photoionization mode (Mini He‐PDD), it is a universal detector for both inorganic and organic compounds. This is especially useful when detection of water is needed in GC×GC applications. When krypton is doped in the helium discharge gas (Mini Kr‐PDD), it can suppress signals of compounds having higher ionization potentials and enhance relative signal intensities of aromatic compounds. The determination of aliphatic to aromatic hydrocarbon ratios is essential to the operation of petroleum crackers. Comparison of the signal from two modes of the Mini‐PDD is a simple and fast way to verify the location of aromatics in comprehensive 2‐D gas chromatograms.