法国斯特拉斯堡大气中多环芳烃( PAHs )的时间分布和气/颗粒划分

ty10086 提交于 周三, 08/25/2021 - 15:56
文章英文标题
Temporal Distribution and Gas/Particle Partitioning of Polycyclic Aromatic Hydrocarbons (PAHs) in the Atmosphere of Strasbourg, France
正文
2018年5月至2020年3月,在位于法国东北部阿尔萨斯地区的大城市斯特拉斯堡,测定了多环芳烃的气体和颗粒相环境空气浓度,以研究其时间变化的演变及其潜在来源。多环芳烃分析采用允许农药、多环芳烃和多氯联苯( PCBs )定量的全局分析方法,采用加速溶剂萃取( ASE )和固相萃取( SPE )提取过滤器和碳掺杂碳化硅NMC @ SiC泡沫,然后采用气相色谱-串联质谱( GC-MS / MS )分析萃取物。平均总(气体+颗粒物)浓度为0.51 ~ 117.31 ng m–3,平均值为16.87 ng m–3,其中冷季的气体和颗粒物浓度分别是暖季的2.5倍和6倍以上。此外,低分子量( LMW ) ( 2 -环和3 -环)和中分子量( MMW ) ( 4 -环) PAHs对气相贡献较大,而颗粒相则与MMW ( 4 -环)和高分子量( HMW ) ( 5 -环和6 -环) PAHs有关。计算气/颗粒分配系数( log Kp ),其值在-4.13 ~ -1.49之间变化,可以看出log Kp随PAHs分子量的增大而增大,HMW PAHs的log Kp在冷季和暖季不同,而LMW PAHs则不相同。用于估算Strasbourg大气PAHs初级来源的PAHs诊断比值表明,燃料燃烧和生物质/煤燃烧是Strasbourg大气PAHs的可能来源。
文章内容(英文)
Gas and particulate phase ambient air concentrations of polycyclic aromatic hydrocarbons (Ʃ16PAHs) were determined in Strasbourg, a large city located in the Alsace region of northeastern France, from May 2018 to March 2020, to study the evolution of their temporal variations and their potential origins. The analysis of PAHs was performed using a global analytical method permitting the quantification of pesticides, PAHs, and polychlorobiphenyls (PCBs). Filters and Carbon doped silicon carbide NMC@SiC foams were extracted by accelerated solvent extraction (ASE) followed by a solid-phase extraction (SPE). Afterwards, extracts were analyzed using gas chromatography coupled to tandem mass spectrometry (GC-MS/MS). Prior to analysis, a pre-concentration step based on solid-phase microextraction (SPME) was used with a polydimethylsiloxane (PDMS) 100 µm fiber. The average total (gas plus particulate) concentration of Ʃ16PAHs varied from 0.51 to 117.31 ng m−3 with a mean of 16.87 ng m−3, with higher concentrations in the cold season of more than 2.5-fold and 6-fold that in the warm season for the gas and particulate phases, respectively. Moreover, low molecular weight (LMW) (2-ring and 3-ring) and medium molecular weight (MMW) (4-ring) PAHs contribute dominantly to the gas phase, while the particulate phase is associated with MMW (4-ring) and high molecular weight (HMW) (5-ring and 6-ring) PAHs. Gas/particle partitioning coefficient (log Kp) was calculated, and values varied between −4.13 and −1.49. It can be seen that the log Kp increased with the molecular weight of the PAHs and that the log Kp is different between cold and warm seasons for HMW PAHs but not for LMW PAHs. Diagnostic ratios of PAHs, which were employed to estimate the primary source of PAHs in Strasbourg, indicate that fuel combustion and biomass/coal burning are the possible origins of PAHs in Strasbourg’s atmosphere.
来源出处
Journal|[J]AtmosphereVolume 12, Issue 3. 2021. PP 337-337
DOI
https://doi.org/10.3390/ATMOS12030337

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