排ガス中窒素酸化物のアルカリ吸収による亜鉛還元-ナフチルエチレンジアミン法の検討

概要

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A new method was proposed for the determination of nitrogen oxides in flue gases. A volume of 50 ml each of sample gases was introduced into a 100ml syringe, followed by the addition of 20 ml of the alkaline absorption solution containing 0.03 % hydrogen peroxide and 30 ml of oxygen. After the completion of the (15〜20)min oxidation and absorption of nitrogen oxides, one ml of 6 N sulfuric acid was added to the absorption solution in order to decompose the excess of hydrogen peroxide by the careful addition of a 0.3 % solution of potassium permanganate. The pH range of the obtained solution was adjusted to 6〜8 and the nitrate ions determined by the same analytical procedure as that of the zinc reductionnaphthylethylenediamine method. With the present method nitric oxide of about 85 ppm was successfully determined without any interferences of ammonia of up to 1000 ppm and of sulfur dioxide of more than 1000 ppm.
社団法人日本分析化学会の論文
1980-06-05