Gas chromatographic determination of trace impurities in high-purity nitrogen using hydrogen storage alloys as a nitrogen adsorbent

Abstract

Gassmann, E.; Pericles. N.; Anton, K. Anal. Chem. 198g7 61 I 876-883. Finchman. W. H. A.: Freeman, M. H. Opfics, 8th ed.; Butterworths: London, 1974; pp 15-21. Wang, T.; Hartwick, R. A,; Champlin. P. B.A comblnatlon of two dlfferent hydrogen storage alloys was used to assist in the gas chromatographic determlnatlon of trace impurities, such as neon, argon, krypton, methane, and xenon, in nitrogen. Thls system conslsts of a gas chromatograph combined, in series, with two precoiumns filled with WMn-type and Ca-type hydrogen storage alloys. The former alloy efficiently retalns nitrogen at 250 O C and under the pressure of the carrier gas. The latter alloy is used in order to more efficiently adsorb hydrogen, whlch is released from the former alloy, at ambient temperature. By using a photoionlzatlon detector, the detection limits achieved were as follows: 3.7, 0.08, 0.03, 0.04, and 0.09 ppm for Ne, Ar, Kr, CH,, and Xe, respectively.

The Cryogenic Enrichment System in Chromatographic Analysis of Noble Gases in Groundwater

“…1). Columns K3 and K4 are filled with a molecular sieve 5A [14,15]. The column K5 is filled with a molecular sieve 5A and activated charcoal in a ratio of 1/1 [16].…”

Impurity Analysis of 5.5 N Nitrogen Gas and Its Impact on the Preparation of Class I Type Calibration Gas Mixtures

“…Many analytical techniques are available and used for trace level measurements e. g. electrochemical sensors, GC (gas chromatography) operated via different detectors like FID (Flame Ionization Detector), TCD (Thermal Conductivity Detector), PDHID (Pulse Discharge Helium Ionization Detector) and significant FTIR (Fourier Transform Infrared Spectroscopy). [7][8][9] Moreover, remarkable attention was gained by the wavelength-dependent absorption of analyte using optical spectroscopic methods like differential absorption lidar (DIAL), differential optical absorption spectroscopy (DOAS), and CRDS (cavity ring-down spectroscopy). [10,11] Functioning of CRDS is based upon regulating laser beam wavelength within IR range where the contaminant absorption peak occurs.…”