Organic nitrates in the atmosphere are associated with photochemical pollution and are the main components of secondary organic aerosols, which are related to haze. An efficient method for determining organic nitrates in atmospheric fine particles (PM2.5) was established using synthesized standards. Four alkyl (C7-C10) nitrates and three aromatic nitrates (tolyl nitrate, phenethyl nitrate, and p-xylyl nitrate) were synthesized and characterized by 1H and 13C nuclear magnetic resonance spectroscopy. The optimal ions for quantifying and confirming the identities of the analytes were identified by analyzing the standards by gas chromatography tandem mass spectrometry. The tandem mass spectrometer was a triple quadrupole instrument. This method can obtain more accurate information of organic nitrates than on-line methods. Spiked recovery tests were performed using three spike concentrations, and the recoveries were 61.0-111.4 %, and the relative standard deviations were < 8.2% for all of the analytes. Limits of detection and quantification were determined, and the linearity of the method for each analyte was assessed. The applicability of the method was demonstrated by analyzing six PM2.5 samples. Overall, 87% of the analytes were detected in the samples. Phenethyl nitrate, heptyl nitrate, and octyl nitrate were detected in every sample. Phenethyl nitrate was found at a higher mean concentration (3.23 ng/m3) than the other analytes.

中文翻译：

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通过气相色谱串联质谱法测定大气颗粒中的烷基和芳族硝酸盐。

大气中的有机硝酸盐与光化学污染有关，是二次有机气溶胶的主要成分，与雾霾有关。使用合成标准建立了一种测定大气细颗粒物 (PM2.5) 中有机硝酸盐的有效方法。合成了四种烷基 (C7-C10) 硝酸盐和三种芳香族硝酸盐（硝酸甲苯、苯乙基硝酸酯和对二甲苯基硝酸酯），并通过 1H 和 13C 核磁共振光谱对其进行了表征。通过气相色谱串联质谱法分析标准品，确定了用于定量和确认分析物特性的最佳离子。串联质谱仪是三重四极杆仪器。与在线方法相比，该方法可以获得更准确的有机硝酸盐信息。使用三种加标浓度进行加标回收率测试，回收率为 61.0-111.4%，所有分析物的相对标准偏差 < 8.2%。确定了检测限和定量限，并评估了每种分析物的方法线性。通过分析六个 PM2.5 样品证明了该方法的适用性。总体而言，样品中检测到 87% 的分析物。在每个样品中都检测到硝酸苯乙酯、硝酸庚酯和硝酸辛酯。发现硝酸苯乙酯的平均浓度 (3.23 ng/m3) 高于其他分析物。并对每种分析物的方法线性进行了评估。通过分析六个 PM2.5 样品证明了该方法的适用性。总体而言，样品中检测到 87% 的分析物。在每个样品中都检测到硝酸苯乙酯、硝酸庚酯和硝酸辛酯。发现硝酸苯乙酯的平均浓度 (3.23 ng/m3) 高于其他分析物。并对每种分析物的方法线性进行了评估。通过分析六个 PM2.5 样品证明了该方法的适用性。总体而言，样品中检测到 87% 的分析物。在每个样品中都检测到硝酸苯乙酯、硝酸庚酯和硝酸辛酯。发现硝酸苯乙酯的平均浓度 (3.23 ng/m3) 高于其他分析物。