In Japan the A. S. T. M. syringe method has been widely used as a means of measuring odor concentration. This method, however, has several disadvantages, such as adsorption of odors on the syringe surface and small capacity of syringe.
Thus, in order to eliminate the disadvantages in the method, the syringe was replaced by th plastic bag (the volume is 3 liters), and the preconceived idea of the panel was removed by adopting the triangle method.
The volumetric error of the bag was at most several percent as a result of our experiments, and the diffusion rate of sample gas in the bag was less than 1 minute.
Measured results of this method were 410-1, 700 odor concentration at the printing (gravure), 31, 000 at the fishmeal plant, 97-310 at the boiler (city gas, kerosene), 4, 100 at the boiler (heavy oil C) and so no. The results were in approximate agreement with the damaged condition.
