Application of hydrogen storage alloy for the determination of trace impurities in high-purity hydrogen by gas chromatography

Aomura, Yoko; Mizuno, Masashi

doi:10.1021/ac00209a005

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…U-shaped stainless steel tube) was packed with a Ti/Mn-type HSA (16/60 mesh, 28 g), and the second precolumn (a 12-cm X 3/8-in.-o.d. stainless steel tube) was packed with a Ca-type HSA (16/60 mesh, 7.2 g): the construction of the first precolumn is shown in a previous paper (4). Nitrogen was preferentially absorbed by the first precolumn operated at elevated temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The activation and regeneration procedures of the Ca-type HSA are almost similar with that already described except for the final temperature. The care during handling, storage, and disposal of these activated HSAs is described in our previous paper (4).…”

Section: Methodsmentioning

confidence: 99%

“…The photoionization detector (PID), which is based on the emission from a direct current discharge in helium gas (2), is the universal sensitive detector {1, 2) and has especially high sensitivity for permanent gases. We reported in previous papers (3)(4)(5) that the PID is suitable for the determination of trace amounts of such gases. However, it has still been hard to separate and accurately determine trace amounts of impurities at less than parts per million levels in nitrogen: the use of a high-sensitivity 0003-2700/91 /0363-1376802.50/0 © 1991 American Chemical Society to rotary vacuum pump, (11) hydrogen/hellum outlet, (12) hydrogen Inlet, (13) helium Inlet, (14) sample gas inlet, (15) dilution gas (He/N2) inlet, (16) sample gas outlet, (17) to rotary vacuum pump.…”

Section: Introductionmentioning

confidence: 99%

“…For the last 2 decades, hydrogen storage alloys (HSAs), such as LaNi8, have provided purification and storage techniques for hydrogen gas (6,7). We have published methods for applying hydrogen storage alloys to gas analysis techniques (3)(4)(5). This paper describes a new analytical method for determining trace impurities in nitrogen by the use of a photoionization detector (PID) and two different types of hydrogen storage alloys as a nitrogen adsorbent.…”

Section: Introductionmentioning

confidence: 99%

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

Ogino¹,

Aomura²,

Seki³

1991

Anal. Chem.

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ogino¹,

Aomura²,

Seki³

1991

Anal. Chem.

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Radiation effects in static SIMS of polymers

Licciardello

Wenclawiak

Boes

et al. 1994

Surface & Interface Analysis

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The formation of dimerized polystyrene molecules during static SIMS measurements, already reported in a previous paper [Surf. Interface Anal. 20, 549 (1993)l has been further investigated. Samples of styrene oligomers with very narrow molecular weight distribution were prepared by fractionating polystyrene standards by means of supercritical fluid chromatography and then irradiated in situ in a time-of-flight SIMS spectrometer. Pre-irradiated samples have also been studied for comparison purposes. The results obtained confirm that crosslinked (dimerized) species are formed and detected in the very low fluence range, and strongly support the hypothesis that, at least partly, the observation of this kind of ion beam modification is not due to ion impact overlaps during the measurement, but to primary modification/desorption events.

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Selective enhancement for neon detection in a helium discharge photoionization detector

Aomura¹

1994

Journal of Chromatography A

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Application of hydrogen storage alloy for the determination of trace impurities in high-purity hydrogen by gas chromatography

Cited by 15 publications

References 8 publications

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

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

Radiation effects in static SIMS of polymers

Selective enhancement for neon detection in a helium discharge photoionization detector

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