4. Hydrocarbon analysis with a VICI pulsed discharge detector (PDD)   Courtesy of Scott-Marrin, Inc. John Marrin, president   No ambient air quality analysis is complete without an accurate quantitation of the toxic organic volatile hydrocarbons. The typical gas standard used in calibrating such an analysis is a mixture of paraffins/BTEX in nitrogen. This chromatogram illustrates how the detector’s sensitivity to the air peak is suppressed when argon is added as a dopant. It also shows the PDD’s remarkable sensitivity to a 30 ppb calibration mixture.     Sample: 30 ppb paraffins/BTEX blend in nitrogen Detector mode: Argon photoionization Detector temp: 40°C Column: 20 m x 0.053 mm DB-1 Column temp: 30°C for 1 min to 110°C at 8°/min Sample volume: 250 µL, injection valve Discharge gas: 1.5% Ar (mole) in helium, 30 mL/min Dopant gas: None Atten / Range: 2 x 10-1 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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