13. Impurities in hydrocarbon feedstocks with a VICI pulsed discharge detector (PDD)   Courtesy of Dow Chemical, Canada Western Canada Operations, Analytical Sciences, Jim Luong   Feedstock purity is a prime consideration in the polymer industry, since it determines the feedstock's quality and value. Detection and quantitation of minor impurities can be problematic, requiring complex column switching to prevent the matrix peak from overwhelming the detector. Since the PDD's discharge gas stream is separate from its carrier stream, the matrix peak never enters the discharge region; thus, the PDD recovers as soon as the peak elutes from the column, minimizing analysis time.     Sample: Synthetic standard of hydrocarbons in ethylene Detector mode: Helium photoionization Detector temp: 100°C Column: CP-Porabond Q, 25m x 0.53mm Column temp: 600°C Sample volume:  250 µL Discharge gas: Helium Dopant gas: None Attenuation: 1 Additional chromatograms 1.  10 ppt SF6 in ultrapure air 2.  30 ppb vinyl chloride in nitrogen 3.  Haloalkanes mixture in methanol 4.  Hydrocarbon analysis 5.  Impurities in food grade CO 2 6.  N2 , O2 , and CO2 in acrylic syrup 7.  Natural gas liquid (NGL) 8.  n-Paraffin wax standard 9.  Pesticide analysis 10.  Trace impurities in high purity hydrogen 11.  Trace impurities in bulk gases 12.  Hydrocarbon analysis (comparing FID and PDD) 13.  Impurities in hydrocarbon feedstocks 14.  PAH residues in soil from a Superfund site 15.  PAH residues in an environmental soil sample spike 16.  Herbicides in soil samples using EPA Method 8151
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