Trace impurities in high purity hydrogen - VICI PDD chromatogram #10

10.

Trace impurities in high purity hydrogen
with a VICI pulsed discharge detector (PDD)

Courtesy of Unicam Chromatography
B. Lawrence and M. J. C. Smith

In trace level detection, a critical aspect of detector performance is how quickly it recovers from the matrix peak. Many detectors are rendered inoperative until all of the matrix has left the ionization region of the detector. Since the discharge gas in the PDD is separate from the carrier stream, the bulk of the matrix peak never enters the discharge region, resulting in a speedy recovery.

Sample:	Bulk hydrogen
Detector mode:	Helium photoionization
Detector temp:	100°C
Columns:
Stripper:	0.5 m x 1/8" Silica gel
Heartcut:	1 m x 1/8" MoleSieve 5A
Analysis:	2 m x 1/8" MoleSieve 5A
Column temp:	80°C
Injector temp:	100°C
Sample volume:	1 mL
Discharge gas:	Helium, 30 mL/min
Dopant gas:	None

	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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