Abstract
A previously described method for the determination of carbon, hydrogen, and nitrogen has been improved with respect to procedure and apparatus. The sample is burned in a measured amount of pure oxygen. Excess oxygen is absorbed on copper. Nitrogen oxides are reduced. Water is absorbed on a calcium chloride-quartz mixture, and carbon dioxide on a layer of molecular sieve 5A. Nitrogen is detected first, and the signal integrated on an integrator with digital read out. Carbon dioxide is then desorbed through heating and is similarly quantitated. Finally, water is desorbed and determined. Alternate peak height methods were evaluated, but were not accurate enough for micro elemental analysis. The necessary conditions for accurate integration are discussed.
Published Version
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