Trace impurities in bulk gases - VICI PDD chromatogram #11

11.

Trace impurities in bulk gases
with a VICI pulsed discharge detector (PDD)

Courtesy of Bernardo Garcia, Ph. D.
Valco Instruments Co. Inc.

Trace level detection of impurities in inorganic gases is crucial for the bulk gas and semiconductor industries. Analysis of impurities in hydrogen is traditionally performed in conjunction with a palladium diffusion tube to eliminate the bulk hydrogen peak. This analysis, performed on a Valco Trace Gas Analyzer (TGA) equipped with the PDD, eliminates the palladium tube and highlights the sensitivity and stability (fast recovery from the bulk peaks) of the PDD.

Sample:	2 ppm permanent gas blend in bulk hydrogen
Detector mode:	Helium photoionization
Detector temp:	100°C
Columns:
Heartcut:	10' x 1/8" MoleSieve 5A
Analysis:	10' x 1/8" MoleSieve 5A
Column temp:	100°C
Sample volume:	250 µL
Discharge gas:	Helium
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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