用排水の保存方法の検討(第1報)用排水中の亜硝酸性窒素の保存方法

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The usual method of preserving the samples for NO_2-N analysis in a strong acid condition was found to be unsuitable because NO_2-N decreases with time. This decrease rate after 24 hr was found to be 3% at pH 4.0,22% at pH 3.5. and 55% at pH 2.0 for 20.0 ppm of NO_2-N. Decrease rate of NO_2-N at pH 2.0 was found to be different according to its initial concentration. The rates after 27 hr were 9.5% with 2.0 ppm of NO_2-N, 30.5% with 10.0 ppm, 34.5% with 20.0 ppm, 28.0% with 50.0 ppm, and 25.5% with 100.0 ppm of NO_2-N. NO_2-N in water and wastewater did not change by the addition of 40 mg/liter of HgCl_2,5 ml/liter of CHCl_3,or 5 ml/liter of CH_2Cl-CH_2Cl. When NO_2-N is to be analyzed within 24 hr of sampling, it is recommended that the sample be preserved at 5°.
公益社団法人日本薬学会の論文
1976-12-31