淄博市供暖前后PM2.5中多环芳烃及其衍生物污染特征、来源及健康风险

大气中的多环芳烃(PAHs)及其衍生物是影响环境和威胁人类健康的全球性问题.为了研究淄博市PM_2.5中PAHs及其衍生物的污染特征、来源和健康风险，于2020年11月5日至12月26日期间采集PM_2.5样品，使用气相色谱-质谱联用仪(GC-MS)分析PM_2.5中的16种常规PAHs、9种NPAHs和5种OPAHs的浓度，利用特征比值法和PMF模型对其主要来源进行解析，并使用基于源解析结果的终生致癌风险模型(ILCR)评估了供暖前后PAHs及其衍生物对成年男女的健康风险.结果表明，采样期间淄博市PM_2.5中∑₁₆p PAHs、∑₉NPAHs和∑₅OPAHs浓度均值分别为：(41.61±13.40)、(6.38±5.70)和(53.20±53.47)ng·m^-3，供暖后3类PAHs浓度明显增加，分别为供暖前的1.31、2.04和5.24倍.采样期间(Chr)、苯并[a]芘(Ba P)和苯并[a]蒽(Ba A)为p P...

Characteristics, Sources Apportionment, and Health Risks of PM2.5-bound PAHs and Their Derivatives Before and After Heating in Zibo City

Atmospheric polycyclic aromatic hydrocarbons (PAHs) and their derivatives are a global problem that influences the environment and threatens human health. To investigate the characteristics, sources, and health risk assessment of PM_2.5-bound PAHs and their derivatives, PM_2.5 were collected at an urban site in Zibo from November 5 to December 26, 2020, and the concentrations of 16 conventional PAHs, nine NPAHs, and five OPAHs in PM_2.5 were analyzed using gas chromatography-mass spectrometry. Source apportionment of PAHs and their derivatives was conducted using diagnostic ratios and a PMF model, and the health risks of PAHs and their derivatives to adult men and women were evaluated using the source-dependent incremental lifetime cancer risk (ILCR) model. The results showed that the average concentrations of ∑₁₆pPAHs, ∑₉NPAHs, and ∑₅OPAHs in PM_2.5 of Zibo City during the sampling period were (41.61 ± 13.40), (6.38 ± 5.70), and (53.20 ± 53.47) ng·m^-3, respectively. The concentrations of the three PAHs increased significantly after heating, which were 1.31, 2.04, and 5.24 times larger than those before heating. During the sampling period, Chr, BaP, and BaA were the dominant components of pPAHs; 9N-Ant and 2N-Flt + 3N-Flt were the dominant components of NPAHs; and ATQ and BZO were the dominant components of OPAHs. Source apportionment results showed that motor vehicles were the main source of PAHs and their derivatives in PM_2.5 before heating, whereas after heating, the main sources were the mixed source of coal and biomass combustion and secondary formation. The total BaP equivalent (TEQ) was 14.5 ng·m^-3 during the sampling period, and the TEQ increased significantly after heating, which was approximately 1.2 times of that before heating. Assisted by the individual PAH source apportionment results, the ILCR of PM_2.5-boundPAHs and NPAHs in Zibo City had a certain potential carcinogenic risk for adult males (1.06 × 10^-5) and females (9.32 × 10^-6). Among them, the health risks of PAHs from gasoline vehicles, diesel vehicles, and coal/biomass combustion were significantly higher than those from other emission sources.