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• W3178121424 abstract "Gas-particle (G/P) partition is the determining factor to the behaviors of semi-volatile organic compounds (SVOCs) in atmosphere, such as transport and deposition. Based on a case study on the measurement of atmospheric polycyclic aromatic hydrocarbons (PAHs) in Harbin City in China from June 2014 to May 2019, the long-term temporal trend of G/P partition of PAHs and its influencing factors were comprehensively studied. The results indicated that an obvious decreasing temporal trend was observed for total suspended particle (TSP) with the annual mean concentrations of 180, 173, 134, 132, and 119 μg/m 3 for the five years. The results demonstrated the effectiveness of the Clean Air Action on decreasing TSP levels in Harbin City. For most PAHs, obvious long-term temporal trends and seasonal variations were observed for the particulate phase fraction ( φ P ) and the G/P partitioning quotient ( K P ) by fitting with a simple harmonic regression method. Significant correlations between φ P with temperature and TSP indicated their influences on the temporal trend of φ P . Similarly, the temperature was also the direct influencing factor to the temporal trend of K P . For the five years, non-obvious differences were observed with the linear relationships between log K P vs. log K OA , and between log K P vs. log P L . The comparison between the monitoring data of φ P and log K P with the prediction data from the G/P partitioning models indicated that the predictions of the models did not well match all the monitoring data for the period. Therefore, more studies should be conducted to better understand the G/P partitioning mechanism of PAHs in atmosphere and to establish more accurate G/P partitioning models. In summary, the results of the present study provided new insight into the G/P partitioning behavior of PAHs in the atmosphere, especially for the temporal trend of φ P and log K P . • Temporal trend of gas-particle partition of PAHs were comprehensively studied. • Particulate phase fraction ( φ P ) and G/P partitioning quotient ( K P ) were calculated. • Obvious temporal trends and seasonal variations were observed for φ P and K P . • Temperature and TSP were influence factors on temporal trends of G/P partition. • More studies are need to better understand the G/P partitioning mechanism of PAHs." @default.
• W3178121424 created "2021-07-19" @default.
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• W3178121424 date "2021-09-01" @default.
• W3178121424 modified "2023-10-16" @default.
• W3178121424 title "Temporal trends of atmospheric PAHs: Implications for the gas-particle partition" @default.
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• W3178121424 doi "https://doi.org/10.1016/j.atmosenv.2021.118595" @default.
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