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Reduction of nitrite by sulfamic acid and sodium azide from aqueous solutions treated by gliding arc discharge

机译:滑弧放电处理后的水溶液中氨基磺酸和叠氮化钠还原亚硝酸盐

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摘要

Nitrous and nitric acids form in aqueous solutions exposed to a gliding arc discharge burning in humid air.The anions interfere when the concentration of particular solutes such as pollutants must be determined.In particular they falsify the COD measurements and spectral investigations and thus the efficiency of the plasma treatment in pollutant abatement.The nitrite anions must be thus removed,which require specific reagents.The influence of parameters such as solution pH and [reducers]/[(NO_2~)-] ratio on the reduction reaction was evaluated.The reduction of nitrite into N_2 either by sulfamic acid or sodium azide is a first-order pH-dependant reaction with regard to nitrite and reducers (k_1 =2.93 x 10~(-1) m~3 kmol~(-1) s~(-1);k_2 =6.21 x 10~(-1) m~3 kmol~(-1) s~(-1),respectively).Sodium azide is thus more reactive than sulfamic acid.
机译:暴露在潮湿空气中燃烧的滑动电弧放电中的水溶液中会形成亚硝酸和硝酸,当必须确定特定溶质(例如污染物)的浓度时,阴离子会干扰,特别是它们会伪造COD测量和光谱研究,从而影响COD的效率在去除污染物的等离子体处理中,必须除去亚硝酸根阴离子,这需要特定的试剂。评估了溶液pH和[reducers] / [(NO_2〜)-]之类的参数对还原反应的影响。氨基磺酸或叠氮化钠将亚硝酸盐转化为N_2是关于亚硝酸盐和还原剂的一阶pH依赖反应(k_1 = 2.93 x 10〜(-1)m〜3 kmol〜(-1)s〜(- 1); k_2分别为6.21 x 10〜(-1)m〜3 kmol〜(-1)s〜(-1)),因此叠氮化钠比氨基磺酸更具反应性。

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