METHOD FOR DETERMINING CONCENTRATION OF VERY SMALL AMOUNT AMMONIA IN AIR

摘要

PROBLEM TO BE SOLVED: To enable every one to easily determine a very small amount of ammonia, in real time which is present in air in an art museum, a clean room, etc. and harms works of art, electronic devices, etc.;SOLUTION: A tube comprises an air inlet and an exhaust opening. A detecting agent, which is discolored by reaction with ammonia is filled in the tube in such a way as to be seen through from outside the tube to form an ammonia-detecting tube. When the concentration of ammonia is determined through the use of the ammonia detecting tube on air, in which ammonia of an amount of 50 μg/m³ or less is present, the air inlet of the detecting tube is opened to a measuring space. The exhaust opening is connected to a suction means, to continuously pass the air in the space through the tube at a uniform quantity of flow between 200-600 mL/min at least for 30 minutes or longer. From the integrated value of the total amount of air, passed through the tube and the length of discoloration of the detecting agent, the concentration of ammonia in the air is determined in the method for determining the trace amount of ammonia in air.;COPYRIGHT: (C)2004,JPO