Analytical method and apparatus for the determination of the total nitrogen content in a sample

• Main Author: ITOH, TADAMASA
• Format: Patent
• Language: English; French; German
• Published: 10.12.1980
• Subjects: GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING

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 DEG to 1100 DEG 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 DEG to 800 DEG 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.