Measurements of nitrous acid concentration in the atmosphere using chemical ionization mass spectrometry

将化学电离质谱法应用于大气中亚硝酸的测定。通过优化化学电离的反应条件和提高初级离子的信号强度，可以在1分钟的积分时间内获得40 PPTV的检出限。通过实验室实验和从头计算研究了其他大气物种干扰的可能性。对湿空气中二氧化氮的干扰进行了实验量化。对札幌市的亚硝酸进行了初步测定。

Chemical ionization mass spectrometry was applied to the measurement of nitrous acid in the atmosphere. By optimizing reaction conditions for the chemical ionization and increasing the signal intensity of the primary ion, the limit of detection of 40 pptv can be obtained for an integration time of 1 minute. Possibility of the interferences from other atmospheric species was investigated by laboratory experiments and ab initio calculations. The interference from nitrogen dioxide in humid air was experimentally quantified. Preliminary measurements of nitrous acid were carried out in Sapporo city.