The Questions and Their Solutions on the Methods for the Determination of Nitrogen Oxides in Flue Gases

概要

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The standard methods for the determination of nitrogen oxides in flue gases have been established as the JIS K 0104 which include naphthylethylenediamine method and phenoldisulfonic acid method. We have investigated the questions of their methods and proposed the solutions of them as follows: (1) Naphthylethylenediamine method for determination of nitric oxide. (a) to take oxygen instead of air as a oxidation reagent for nitric oxide. (b) to sample the gases after removed sulfur dioxide by passing the gases through hydrogen peroxide solution. (c) to take 0.7 instead of 0.5 as the ratio of nitrite ion formation from nitrogen oxides. (2) Phenoldisulfonic acid method for determination of nitrogen oxides. (a) to take 0.3% of hydrogen peroxide solution in stead of 0.03% solution as a absorption solution. (b) to determine the absolute pressure in the gas sampling flask before sampling gases. (3) Naphthylethylenediamine method for determination of nitrogen dioxide. (a) to purge out the remained gases in the absorption vessel, which contain nitric oxide, by introducing nitrogen in it. (b) to take the saltzman reagent instead of sodium hydroxide as a absorption solution. (c) to correct the sampled gas volume as much as the same volume of carbon dioxide absorbed into the solution.
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