摘要：选用元素分析仪测定大气气溶胶样品中的总氮含量, 并使用总有机碳分析仪和离子色谱仪分别获得水溶性总氮和水溶性无机氮组分的含量;在此基础之上, 通过相差法获得气溶胶中的水溶性有机氮和非水溶性氮组分含量;对本方法的精确度和准确度进行评估, 及使用此方法对西安市大气细颗粒物PM_2.5中含氮组分的进一步分析。结果表明, 本方法能够系统准确地测试大气气溶胶中的多种含氮组分含量, 可操作性强。

关键词：大气气溶胶；细颗粒物 (PM_2.5) ；氮沉降；元素分析

Abstract：The elemental analyzer was used innovatively to analyze the total nitrogen content in atmospheric aerosol, the total organic carbon and ion chromatography were used to determine water-soluble total nitrogen and water-soluble inorganic nitrogen content respectively. Otherwise, the water-soluble organic nitrogen and insoluble total nitrogen based on the estimated subtracting methods were also obtained. The analysis results of the application example of PM_2.5in Xi'an demonstrated that these nitrogen analytical methods and the estimated subtracting method are accuracy and strong operability.

Keywords：atmospheric aerosol; fine particulate matter (PM_2.5) ; nitrogen deposition; elemental analysis