Rapid Determination Method of Oxygen Contained in Organic Compounds by Means of Contact Thermal Decomposition

HONMA Haruo

doi:10.2116/bunsekikagaku.54.57

A procedure for a quick determination of the amount of the oxygen element present by means of contact thermal decomposition is as follows. Approximately 10 ml of carbon black is filled into a molybdenum cylindrical crucible developed by us. The crucible is heated to 1300°C, and a sample contained in a silver capsule is dropped into it for instantaneous thermal decomposition, by which the oxygen element is reduced to carbon monoxide. The principle of the method is that the carbon monoxide is oxidized to carbon dioxide at 650°C, and the amount of the resulting carbon dioxide can be determined using an infrared detector. The method of determination has been established by examining in detail the fundamental aspects listed below: 1) fabrication of prototypes of various instruments and evaluations of their functions, 2) adjustment of the reagent and apparatus used for the determination, 3) determination of a reference value for a blank test value and its behavior, 4) correction for obtaining a linear correlation between the signals detected by an infrared detector and to component concentration, 5) to contact thermal decomposition temperature, 6) a comparison of to effects of contact and no-contact thermal decompositions, 7) an examination of to oxidation condition under low temperature for carbon monoxide and 8) a measurement of to time required for a determination. In this study, the amounts of oxygen contained in several standard samples were determined in order to evaluate the accuracies of the obtained based values on the statistics of the determined values.<br>

Rapid Determination Method of Oxygen Contained in Organic Compounds by Means of Contact Thermal Decomposition

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