Departamento de Química, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270901, Brazil.
Departamento de Química, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270901, Brazil.
Chemosphere. 2020 Jul;250:126223. doi: 10.1016/j.chemosphere.2020.126223. Epub 2020 Feb 20.
Air quality in large cities has worsened in recent years as a consequence people's health is directly affected. Among the toxic compounds released to environmental air are polycyclic aromatic hydrocarbons (PAHs), nitrated PAHs (nitro-PAHs), and oxygenated PAHs (oxy-PAHs). Performant methods to analyze these compounds is necessary to enable adequate monitoring of air quality. Thus, this manuscript presents the development of a highly sensitive method to analyze PAHs, nitro-PAHs, and oxy-PAHs collected from ambient air (PM) and the gas phase for a period of one year in the urban area of Belo Horizonte, Brazil. PAHs and their derivatives were extracted by cold fiber solid phase microextraction (CF-SPME) and analyzed by gas chromatography coupled to mass spectrometry (GC/MS). The proposed method allows simultaneous analysis of 16 PAHs, nitro-PAHs and oxy-PAHs, presenting very good limits of detection and quantification, as well as appropriate precision and recovery. The results obtained for the period of one year allowed different studies. The compounds collected simultaneously from gas and particulate phase showed that total concentration of 16 PAHs were higher in the gas phase than in the particulate. On the other hand, nitro-PAHs and oxy-PAHs presented similar concentration in gas and particulate phases. The potential carcinogenicity of PAHs relative to benzo[a]pyrene showed benzo[a]pyrene equivalents of 0.49 ng m. The estimated risk of lifetime lung cancer was 5 × 10. Principal component analysis and diagnostic ratio was applied for source distribution indicating that burning of gasoline, diesel and biomass accounted for the PAHs profile in ambient air samples.
近年来，由于大城市的空气质量恶化，人们的健康受到了直接影响。在释放到环境空气中的有毒化合物中，有多环芳烃（PAHs）、硝基多环芳烃（硝基-PAHs）和含氧多环芳烃（oxy-PAHs）。需要开发高性能的方法来分析这些化合物，以实现对空气质量的充分监测。因此，本文介绍了一种用于分析多环芳烃、硝基多环芳烃和含氧多环芳烃的高灵敏度方法的开发，这些化合物是从巴西贝洛奥里藏特市区的环境空气（PM）和气相中采集的，采集时间为一年。PAHs 及其衍生物通过冷纤维固相微萃取（CF-SPME）提取，并通过气相色谱-质谱联用仪（GC/MS）进行分析。该方法允许同时分析 16 种 PAHs、硝基-PAHs 和 oxy-PAHs，具有非常好的检测限和定量限，以及适当的精密度和回收率。一年时间内获得的结果允许进行不同的研究。同时从气相和颗粒相采集的化合物表明，16 种 PAHs 的总浓度在气相中高于在颗粒相中。另一方面，硝基-PAHs 和 oxy-PAHs 在气相和颗粒相中的浓度相似。与苯并[a]芘相比，PAHs 的潜在致癌性显示苯并[a]芘等效物为 0.49ng/m³。终生肺癌的估计风险为 5×10。主成分分析和诊断比应用于源分布表明，汽油、柴油和生物质的燃烧导致了环境空气样本中 PAHs 的分布。
