Simple and Sensitive Measurement Method of Ammonia in Offensive Odors by Large Amount of Suction-Gas Detector Tube

概要

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A simple and sensitive measurement method of ammonia in offensive odors by large amount of suction-gas detector tube was evaluated in terms of basic efficiency, such as sensitivity and precision, and its practical application to various offensive odors was carried out. The instruments for attaining the large amount of suction were a diaphragm pump, flow meter and wet-type gas meter. Ammonia was measured at a flow rate of 150ml/min for 5 min. The ammonia concentrations examined were in the 1-5 ppm range, which is the regulation standard on the boundary line of sites laiddown in the Japanese Offensive Odor Control Law. The satisfactory results were obtained with regard to sensitivity, precision, discolour tone in the indicator, stability of mean discoloured length, effects of amines and acids, and the time required for this. method. Also, this method (A) was compared with the official method (B; absorption with boric acid solution and analysis using indophenol) by measuring 39 samples with offensive odor obtained from typical ammonia sources such as poultry farm.(the correlation coefficient=0.985, A/B =1.05±0.17 (range: 0.64-1.50)) From these results, it may be concluded that the present method is as practical as the official method for the initial screening tests.
社団法人大気環境学会の論文