An automatic microdetermination of carbon, hydrogen, and nitrogen in organic compounds using data printing system

Abstract

Summary An automatic instrumentation for microdetermination of carbon, hydrogen, and nitrogen in organic compounds involving an automatic sample charger, a double action pump, and a data printing system has been described. A series of 12 quartz capsules containing weighed organic samples can be set in the automatic sample charger and are sequentially charged into a combustion tube. The combustion gas with a carrier gas of helium is withdrawn into one side of the double action pump during a period of 5 minutes and is kept standing for 2.5 minutes for homogenizing. The gas mixture is then pushed out of the pump towards a series of three differential thermal conductometers successively removing or retaining water, carbon dioxide, and nitrogen components. While the double action pump is pushing out the combustion gas towards the thermal conductometers, the next sample can be burned and the combustion gas is withdrawn into the opposite side of the pump. Chargings of the samples are therefore carried out at every 7.5 minutes. An analog-digital converter is provided to print out the successive signals from the thermal condutometers eliminating a need of measuring the length of the bar-gram on strip chart recorder. Evaluations of some error functions of the apparatus have been discussed.