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A Method for the Determination of Volatile Ammonia in Air, Using a Nitrogen-Cooled Trap and Fluorometric Detection

✍ Scribed by H.G. Westra; J.E. van Doorn; R.G. Tigchelaar; J.A. Berden

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
73 KB
Volume
296
Category
Article
ISSN
0003-2697

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✦ Synopsis

A quick, cheap, and accurate method for the determination of ammonia in air is described. Ammonia and water vapor are trapped simultaneously in a gas sampling tube cooled in liquid nitrogen. Subsequently ammonia is derivatized with o-phthaldialdehyde and determined using fluorescence detection. The detection limit of ammonia in a gaseous sample is about 1 nmol per liter of gas. The recovery, using a calibration gas of 6.00 ppm ammonia in nitrogen, is 102.9 ؎ 6.4%. Examples are presented in which this method is used for the determination of ammonia in environmental air and in expired air during exhaustive exercise of a human subject. It is suggested that this method can be used for the determination of volatile ammonia and other compounds in air during environmental and biological monitoring and in research.

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