Natural gas liquid (NGL) - VICI PDD chromatogram #7

7.	Natural gas liquid (NGL) with a VICI pulsed discharge detector (PDD)

Courtesy of Phillips Petroleum Co.
Nak J. Sung, Research Chemist

Natural gas analysis typically utilizes a flame ionization detector (FID). Such an analysis is shown in the lower chromatogram (attenuation x 4). The upper chromatogram was generated with a PDD in the helium photoionization mode (attenuation x 8). These chromatograms demonstrate the similarity in performance between the two detectors. The PDD offers comparable performance without the use of a flame or combustible gases.

Sample:	Natural gas liquid (NGL)
Detector mode:	Helium photoionization
Detector temp:	280°C
Column:	60 m x 0.32 mm x 1 µm, DB-1
Column temp:	60°C for 2 min, to 200°C at 10°C/min
Injector temp:	200°C
Sample volume:	0.5 µL, 100:1 split
Discharge gas:	Helium, 30 mL/min
Dopant gas:	None
Attenuation:	PDD: 8 x 1 FID: 4 x 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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