Analytical method and apparatus for the determination of total nitrogen contents in samples

摘要

An analytical method for the determination of total nitrogen contents in samples, which comprises passing an inert gas stream containing substantially no nitrogen through a first reaction tube which is packed with a decomposition catalyst and oxidizing agent and maintained at a temperature of 700° to 1100° C., a condenser for condensing unnecessary components in the gaseous products from the first reaction tube, a second reaction tube which is packed with an oxidizing agent and a reducing agent and is maintained at a temperature of 400° to 800. degree. C., a moisture-absorbing tube and a carbon dioxide gas- absorbing tube in this order, introducing a liquid sample to be analyzed into the first reaction tube and sending nitrogen gas coming out of the carbon dioxide gas-absorbing tube to a nitrogen gas analyzer to determine the nitrogen gas, and an apparatus for carrying out such a method.