改良フェノールジスルホン酸法による排ガス中の低濃度窒素酸化物の定量

概要

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There is in Japanese Industrial Standard the method for determination of nitrogen oxides (NO_X), JIS K 0104 in which the mesuring range of phenol disulfonic acid method (PDS method) is described to be between 10 and 2000 ppm. However, it is known that this method shows considerably lower values in the range of low concentration of NO_X and requires very long time for analysis. Therefore, the authors devised a gas sampling apparatus in which NO was oxidized with oxdizing gas to remove these weak points. Two methods, the oxidation method with oxygen and oxidation method with ozone, for the determination of NO_X have been experimented. The following results were obtained. (1) Analytical results of NO balanced with nitrogen by this method agreed closely with those by chemiluminescent method (NO_X meter) and standard deviation for 10 ppm NO and 50ppm NO were 0.126 and 0.293 respectively. (2) The time required for analysis was shortened from 1/5 to 1/7 by the use of this method.
1978-02-01