| 摘要 |
1,112,202. Thermo-particulate analysis of organic nitrogenous materials. GENERAL ELECTRIC CO. 28 March, 1966 [29 March, 1965], No. 13568/66. Heading B1X. Organic nitrogenous materials are detected using a condensation nuclei detector 14 by pyrolytically converting the nitrogenous material in an oxygen atmosphere to nitrogen dioxide, chemically reacting the nitrogen dioxide with water to form nitric acid, reacting the acid with a substance capable of donating an electron pair to form therewith a salt of which the particles can act as condensation nuclei, and detecting the condensation nuclei produced with the detector. Preferably the nitric acid is reacted with ammonia to form ammonium nitrate particles to act as condensation nuclei, the water and ammonia being provided separately or as an aqueous solution of ammonium carbonate. Alternatively, the nitrogen dioxide is passed through a humidifier and the nitric acid so formed is then passed over solid ammonium carbonate and reacts with the ammonia gas given off (Fig. 2 not shown). The nitrogenous material is preferably filtered prior to being passed to the pyrolyzer, and is also filtered after pyrolysis to remove any carbon particles. |
