Simultaneous Carbon-Hydrogen-Nitrogen Determination by Gas Chromatography.

Abstract

b This method uses a high frequency induction furnace for the combustion of the sample and utilizes the sensitivity and convenience of the gas chromatograph to detect combustion gases. Rapid combustion eliminates need for the liquid nitrogen trap and allows the determination of nitrogen along with carbon and hydrogen. The technique is based on the combustion and subsequent conversion of the sample to carbon dioxide, nitrogen, and acetylene in a helium atmosphere. Nitrogen, carbon dioxide, and acetylene are separated on a 5-A. Molecular Sieve column, detected b y a thermal conductivity detector, and recorded on a strip chart recorder. This method has a precision to 0.58% absolute for nitrogen, to 0.52% for carbon, and to 0.22% for hydrogen. Five-to 25-mg. samples of inorganic, aliphatic, aromatic, and heterocyclic nitrogen compounds containing oxygen, halogens, and sulfur were run.

Deposit Formation from Deoxygenated Hydrocarbons. I. General Features

“…Deoxygenated fuel B at 69 atm: •, temperature zones at 150-315°C and 0.1 ppm of O2; , temperature zones at 371-538°C and 0.3 ppm of 02. Walker (1962), and sulfur content was determined by combustion followed by a barium perchlorate titration. No significant quantities of S or N were found in the deposit samples.…”

Organic Microchemistry

“…Nightingale and Walker (300) proposed rapid combustion in a high-frequency induction furnace eliminating the necessity for a liquid nitrogen trap for CO:¡, N2, and C2H2.…”

Biochemical Analysis

“…Other papers of interest were the analysis of fatty acids from dialyzed proteins (248), and the determination of the fatty acid methyl esters with a thermal conductivity detector (154). The determination of sulfur in organic compounds was reported (20) and the simultaneous determination of carbon, hydrogen, and nitrogen onto 25-mg. samples was published (249).…”