Analytical method and apparatus for the determination of total n

Details Analytical method and apparatus for the determination of total n Analytical method and apparatus for the determination of total n

1978-12-29

1982-06-01

Marcus, Michael S.

Chemistry: physical processes

Physical processes

Crystallization

422 78, 422 80, 422 89, G01N 3112

Patent

active

043325912

ABSTRACT:
An analytical method for the determination of the total nitrogen content in aqueous systems, which comprises passing an inert gas stream containing substantially no nitrogen and carbon dioxide through a reaction tube, which is packed with a decomposition catalyst and maintained at a temperature of 700.degree. to 1200.degree. C., a condenser and a moisture-absorbing tube in this order, injecting an aqueous test sample to be analyzed into the reaction tube, and sending the gaseous products coming out of the moisture-absorbing tube to a mass spectrometer to determine the nitrogen content, and an apparatus for carrying out such a method. By this method, it is possible to determine the total nitrogen content in nitrogen compounds contained in aqueous systems, rapidly, accurately and with a high sensitivity.

REFERENCES:
patent: 3304159 (1967-02-01), Hinsvark
patent: 4015936 (1977-04-01), Kumazawa
patent: 4025309 (1977-05-01), Hach
patent: 4066402 (1978-01-01), Komiyama et al.
patent: 4095949 (1978-06-01), Flett
Friedel et al.; Mass Spectrometric Analysis of Mixtures Containing Nitrogen Dioxide; Anal. Chem. vol. 25, No. 9, Sep. 1953, pp. 1314-1320.
Ryhage; Use of a Mass Spectrometer as a Detector and Analyzer for Effluents Emerging from High Temperature Gas Liquid Chem. Column; Analytical Chem., vol. 36, No. 4, Apr. 1964, pp. 759-764.

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