活性含氮化合物标准物质的研究进展

    Research Progress of Active Nitrogenous Compounds Reference Materials

    • 摘要: 活性含氮化合物对于大气化学转化至关重要,其来源的去除将会直接影响大气氮循环和二次污染物的生成。活性含氮化合物在大气中物种丰富、浓度分布多样并且部分性质活跃,因此实现活性含氮化合物的准确测量是目前研究的热点和难点。总结了NO、NO2、PAN、HONO、HNO3、ANs和N2O5等典型活性含氮化合物的测量技术,并对其气态标准气体的研发进行了总结介绍。研究表明质谱技术、光谱技术和湿化学技术已经广泛应用于各类活性含氮化合物的在线测量,其测量不确定度分布在(4~30)%,均需要定值准确的标准源进行参数标定和日常维护,但是除NOx外,多数活性含氮化合物的标准源及参数校正仍整体缺乏相应的标准规范。进一步对目前的发展挑战和方向进行了汇总,并就后续的研究进行展望。

       

      Abstract: Reactive nitrogenous compounds are crucial for atmospheric chemistry, and their sequestration and deposition processes will directly affect the atmospheric nitrogen cycle and the generation of secondary pollutants. Since reactive nitrogenous compounds are abundant in the atmosphere with diverse concentrations and some of them are active in nature, so the accurate measurement of reactive nitrogenous compounds is a hot and difficult issue in current research. This study summarizes the measurement techniques of typical reactive nitrogenous compounds, mainly including NO, NO2, PAN, HONO, HNO3, ANs and N2O5, and the progress of their gaseous standard gases. The study shows that mass spectrometry, spectroscopy and wet chemistry have been widely used in the in-situ measurement of various reactive nitrogenous compounds, with measurement uncertainties ranging from 4 to 30%, which require accurate standard sources for parameter calibration and routine maintenance. However, there is still an overall lack of the corresponding specifications for standard sources and parameter corrections for most reactive nitrogenous compounds, with the exception of NOx. This study further summarizes the current development challenges and directions, and provides an outlook on the subsequent development.

       

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