武汉市大气PM 2.5 中多环芳烃的分布特征及来源

Q2 Environmental Science

环境科学研究 Pub Date : 2018-04-25 DOI:10.13198/J.ISSN.1001-6929.2017.04.20

李宽, 周家斌, 袁畅, 邵轩, 黄凡

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引用次数: 1

Abstract

为研究武汉市大气质量状况，在武汉市ID（工业区）、DT（中心城区）、BG（植物园）设3个采样点，连续1 a同步采集了大气中的PM2.5（细颗粒物）样品，并研究了其中PAHs（多环芳烃）的质量浓度、来源和健康风险.结果表明，武汉市ID、DT、BG采样点的ρ（PAHs）年均值分别为（75.60±28.12）（59.77±22.81）（24.27±9.15）ng/m3，并呈冬季最高、夏季最低的季节性变化趋势.PMF（正定矩阵因子分析）结果显示，ID、DT、BG采样点的PAHs的主要来源分别为燃煤和扬尘（35%和33%）、机动车和扬尘（30%和34%）、机动车和木质燃烧（33%和32%），在ID和DT采样点，扬尘对大气颗粒物中PAHs的贡献都很大，而燃煤和木质燃烧分别是ID和BG采样点PAHs的重要来源，在3个采样点中，机动车对颗粒物中PAHs贡献都较大，尤其是DT和BG采样点，机动车的贡献都超过30%.利用后向轨迹模型分析采样期间武汉市的气团来源，并结合每天的ρ（PAHs）发现，不同聚类气团对应的ρ（PAHs）差异很小，表明区域传输对武汉市PAHs贡献不大.通过武汉市大气颗粒物中PAHs吸入风险评估发现，武汉市PAHs的吸入风险范围在10-7~10-5之间，ID和DT采样点的部分人群的吸入风险稍高于安全范围（10-6以下），有潜在的致癌风险.

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Distribution characteristics and sources of polycyclic aromatic hydrocarbons in atmospheric PM 2.5 in Wuhan City

To study the atmospheric quality status of Wuhan City, three sampling points were set up in ID (Industrial Zone), DT (Central Urban Area), and BG (Botanical Garden). PM2.5 (Fine Particle Matter) samples in the atmosphere were collected synchronously for one year, and the mass concentration, source, and health risks of PAHs (Polycyclic Aromatic Hydrocarbons) were studied. The results showed that the ID, DT, and BG sampling points in Wuhan City ρ The average annual values of (PAHs) were (75.60 ± 28.12) (59.77 ± 22.81) (24.27 ± 9.15) ng/m3, respectively, and showed a seasonal trend of highest in winter and lowest in summer. PMF (Positive Definite Matrix Factor Analysis) results showed that the main sources of PAHs at ID, DT, and BG sampling points were coal and dust (35% and 33%), motor vehicles and dust (30% and 34%), motor vehicles and wood combustion (33% and 32%), respectively, Dust contributes significantly to PAHs in atmospheric particulate matter, with coal burning and wood burning being important sources of PAHs at ID and BG sampling points, respectively. Among the three sampling points, motor vehicles contribute significantly to PAHs in particulate matter, especially at DT and BG sampling points, with motor vehicles contributing more than 30%. Backward trajectory models are used to analyze the source of air masses in Wuhan during the sampling period, and combined with daily ρ (PAHs) found that different clusters of air masses correspond to ρ The difference in PAHs is very small, indicating that regional transmission has little contribution to PAHs in Wuhan. Through the assessment of PAHs inhalation risk in atmospheric particulate matter in Wuhan, it was found that the inhalation risk range of PAHs in Wuhan is between 10-7 and 10-5, and some populations at ID and DT sampling points have slightly higher inhalation risk than the safe range (below 10-6), indicating a potential carcinogenic risk

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