Programa de Pós-Graduação em Sensoriamento Remoto e Meteorologia (UFRGS), Porto Alegre, RS, Brazil.
Programa de Pós-Graduação em Sensoriamento Remoto e Meteorologia (UFRGS), Porto Alegre, RS, Brazil; Fundação Estadual de Proteção Ambiental Henrique Luis Roessler, Porto Alegre, RS, Brazil.
Sci Total Environ. 2014 May 1;479-480:57-65. doi: 10.1016/j.scitotenv.2014.01.126. Epub 2014 Feb 15.
The objective of this research was to evaluate nitro-polycyclic aromatic hydrocarbons (NPAHs) associated with ultrafine airborne particles (PM1) in areas affected by vehicles in the metropolitan area of Porto Alegre (MAPA), RS, Brazil. Extraction, isolation/derivatization, and subsequently gas chromatography with electron capture detection (GC/ECD) were the techniques used to extract and determine NPAHs (1-nitronaphthalene, 2-nitrofluorene,3-nitrofluoranthene,1-nitropyrene, and 6-nitrochrysene) associated with PM1 Airborne particles (PM1) were collected using PTFE filters in a PM162M automatic sampler. The analytical method was validated by the Standard Reference Material - SRM 1649 b - from the National Institute of Standards and Technology (NIST, USA). The results were consistent with the certified values. 3-NFlt and 6-NChr reached highest concentrations of 0.047 ng·m(-3) and 0.0284 ng·m(-3), respectively, in Sapucaia do Sul and Canoas. Seasonal variation showed higher NPAH concentrations in cold days. The NPAHs associated with PM1 were correlated with the pollutants nitrogen oxides and NPAHs with meteorological variables: temperature and wind speed. The results indicated that vehicles with diesel engines were influential. This was confirmed by the study of the ratios NPAHs/PAHs, 1-NPyr/Pyr, and 6-NChr/Chr.
本研究旨在评估与车辆相关的超细空气悬浮颗粒 (PM1) 中硝基多环芳烃 (NPAHs)，该研究地点位于巴西阿雷格里港大都市地区 (MAPA)。萃取、分离/衍生化，以及随后的电子捕获检测气相色谱 (GC/ECD) 是用于提取和测定与 PM1 空气悬浮颗粒 (PM1) 相关的 NPAHs（1-硝基萘、2-硝基芴、3-硝基荧蒽、1-硝基芘和 6-硝基苯并[a]蒽）的技术。使用 PTFE 过滤器在 PM162M 自动采样器中收集空气中的 PM1 悬浮颗粒。分析方法通过美国国家标准与技术研究院 (NIST) 的标准参考物质 - SRM 1649 b 进行了验证。结果与认证值一致。3-NFlt 和 6-NChr 在萨普卡伊亚杜苏尔和卡诺阿斯的浓度最高，分别为 0.047ng·m(-3)和 0.0284ng·m(-3)。季节性变化表明，低温天气时 NPAH 浓度更高。与 PM1 相关的 NPAHs 与氮氧化物和 NPAHs 与气象变量（温度和风速）相关。结果表明，柴油发动机车辆具有影响力。这一点通过 NPAHs/PAHs、1-NPyr/Pyr 和 6-NChr/Chr 的比值研究得到了证实。
