Abstract
Following the O-analyser, CH-analyser and N-analyser previously developed, an automatic CHN-analyser is described, based on the principle already used by Walisch. It involves a flash combustion of the sample in a stream of helium with 3% oxygen content, in a vertical reactor, the reduction of nitrogen oxides and removal of excess of oxygen by reduced copper, and the measurement of carbon dioxide, nitrogen and water by a thermal-conductivity cell. The signal from the detector is automatically integrated as a function of time and printed out. The analyser has been fully automated by the use of a vertical reactor, an automatic sample feeder and a collecting tube. This analyser makes possible the simultaneous determination of carbon, hydrogen and nitrogen in stable or unstable solid and liquid organic compounds within 13 min. The precision of results for sample weights in the range 0.2–0.5 mg has been shown to be equivalent to that obtained by Walisch.
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