Atmospheric pressure mass spectrometry (APCI-MS) was used to investigate the positive ions in air containing acetone (A), methanol (M) and mixtures thereof (A + M), subjected to +dc corona discharges. The results of experiments with isotopically labelled analogues, perdeuterated acetone A deu and methanol M deu , and relevant thermochemical data found in the literature allowed us to identify the main ionic reactions occurring in single component systems (A or M) and in binary mixtures (A + M). It is concluded that, thanks to its significantly higher proton affinity, A is very efficient in quenching M-derived ions at atmospheric pressure. These conclusions provide a rationale for interpreting the results of a parallel investigation on the reciprocal effects of M and A when treated together in air at atmospheric pressure with +dc corona in a non-thermal plasma reactor developed previously in our laboratory. Specifically, we observed a marked drop in the degradation efficiency of methanol when it was treated in the presence of an equivalent amount of acetone. This effect is attributed to acetone interfering with ion-initiated degradation processes of methanol, and supports the conclusion that ions and ionic reactions are important in dc+ corona induced oxidation of volatile organic pollutants in air.

中文翻译：

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用于空气净化的大气压非热等离子体：在被丙酮和甲醇污染的空气中由直流+电晕放电引起的离子和离子反应

大气压质谱 (APCI-MS) 用于研究空气中含有丙酮 (A)、甲醇 (M) 及其混合物 (A + M) 的正离子，这些正离子经过 +dc 电晕放电。同位素标记的类似物、全氘丙酮 A deu 和甲醇 M deu 的实验结果以及文献中的相关热化学数据使我们能够确定发生在单组分系统（A 或 M）和二元混合物（A + M）。结论是，由于其显着更高的质子亲和力，A 在大气压下淬灭 M 衍生离子非常有效。这些结论为解释 M 和 A 在大气压力下在空气中与 +dc 电晕一起处理时的相互影响的平行研究结果提供了基本原理，该研究在我们实验室先前开发的非热等离子体反应器中进行。具体而言，我们观察到在等量丙酮存在下处理甲醇时，甲醇的降解效率显着下降。这种效应归因于丙酮干扰了甲醇的离子引发的降解过程，并支持离子和离子反应在 dc+ 电晕诱导的空气中挥发性有机污染物的氧化中很重要的结论。我们观察到在等量丙酮存在下处理甲醇时，甲醇的降解效率显着下降。这种效应归因于丙酮干扰了甲醇的离子引发的降解过程，并支持离子和离子反应在 dc+ 电晕诱导的空气中挥发性有机污染物的氧化中很重要的结论。我们观察到在等量丙酮存在下处理甲醇时，甲醇的降解效率显着下降。这种效应归因于丙酮干扰了甲醇的离子引发的降解过程，并支持离子和离子反应在 dc+ 电晕诱导的空气中挥发性有机污染物的氧化中很重要的结论。