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.
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