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Trace impurities in bulk gases with a VICI pulsed discharge detector

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.

Run conditions

Sample:	2 ppm permanent gas blend in bulk hydrogen
Detector mode:	Helium photoionization
Detector temp:	100°C
Columns Heartcut: Analysis:	10' x 1/8" MoleSieve 5A 10' x 1/8" MoleSieve 5A
Column temp:	100°C
Sample volume:	250 µL
Discharge gas:	Helium
Dopant gas:	none

Further reference

More pulsed discharge detector chromatograms
Pulsed discharge detector product info
ValcoPLOT Molesieve 5A columns