Direct determination of trace oxygen in organic materials with an infrared detector after conversion to carbon monoxide

Oita, I. J.

doi:10.1021/ac00271a023

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…of boron nitride (hot pressed, HBC grade from Union Carbide). The total oxygen content in the boron nitride was 0.2% as determined by using a method described by Oita (19). The plasma tube was held in place in the cavity with a Vrin.…”

Section: Methodsmentioning

confidence: 99%

Oxygen-selective microwave-induced plasma gas chromatography detector for petroleum-related samples

Bradley¹,

Carnahan²

1988

Anal. Chem.

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An atmospheric-pressure, mlcrowave-lnduced, helium plasma system for oxygen-selective gas chromatographic detection of petroleum-related samples Is presented. Extensive purification of the helium plasma gas, exclusion of atmospheric oxygen, and use of an appropriate plasma containment tube were crucial to minimize oxygen spectral emission produced by Impurities In the plasma gas, air leaks, back diffusion of air Into the plasma, and the plasma'containment tube Itself. With these precautions, the oxygen-to-carbon selectivity Is 103. This Is the best oxygen selectivity reported In the literature to date for a mlcrowave-lnduced plasma detector system. The system Is sensitive down to 2 ppmw (parts per million by weight) oxygen for narrow-boiling range distillates and simple mixtures and 500 ppmw oxygen for wide-boiling range, complex samples. The detector Is linear over 3 orders of magnitude and has a uniform response to different types of oxygenates. Examples Illustrate the feasibility of gas chromatography/mlcrowave-lnduced plasma for detecting organic oxygenated compounds in simple mixtures and In petroleum and synfuel distillates boiling up to ca. 500 °F.

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Section: Methodsmentioning

confidence: 99%

Oxygen-selective microwave-induced plasma gas chromatography detector for petroleum-related samples

Bradley¹,

Carnahan²

1988

Anal. Chem.

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On-line δ18O measurement of organic and inorganic substances

Kornexl¹,

Gehre²,

Höfling³

et al. 1999

Rapid Commun. Mass Spectrom.

209

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A method for the automated sample conversion and on-line oxygen isotope ratio (delta(18)O) determination for organic and inorganic substances is presented. The samples are pyrolytically decomposed at 1400 degrees C in the presence of nickelized graphite. With the system presented organic as well as inorganic samples such as nitrates, sulphates and phosphates of 50-100 &mgr;g O can be analyzed for their delta(18)O values with a standard deviation usually better than 0.5 per thousand. Additionally, carbon isotope ratios of organic substances and nitrogen isotope ratios of inorganic nitrogenous compounds are available in the same sample run. Data for international and some inter-laboratory reference materials are presented to show the accuracy and reliability of the method. The effect of some additives on the CO yield was checked for substances which do not pyrolyze completely. Copyright 1999 John Wiley & Sons, Ltd.

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