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Identification of Long-range Transported Polycyclic Aromatic Hydrocarbons in Snow at Mt. Tateyama, Japan

Category: Aerosol and Atmospheric Chemistry

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DOI: 10.4209/aaqr.2018.05.0153

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Kazuichi Hayakawa 1, Ning Tang1,2, Edward G. Nagato1, Akira Toriba2, Kazuma Aoki3

  • 1 Institute of Nature and Environmental Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • 2 Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
  • 3 Faculty of Science, University of Toyama, Toyama-shi, Toyama 930-8555, Japan


Snow layers collected at Mt. Tateyama were separated into particulate and soluble fractions.
PAHs transported from China were identified using HPLC-fluorescence detection.
Distributions of PAHs and inorganic ions differed by snow layer.
PAHs with 5 and 6 rings were almost all in the particulate fraction.
PAHs with 4 rings were at higher or equal concentrations in the soluble fraction.


Snow layers, L-I to -III, collected from the wall of a snow pit at Murododaira, in Mt. Tateyama, Japan, were melted and filtered into soluble (S) and particulate (P) fractions by a glass filter (pore size 0.5 μm). The total concentration of polycyclic aromatic hydrocarbons (PAHs) was highest in L-I. In this layer, concentrations of PAHs with 5 and 6 rings, which exist mainly in particulate matter (PM) in the atmosphere, were almost in the P-fraction. PAHs with 4 rings, which exist in both PM and gas phases in the atmosphere, were at higher or equal concentrations in the S-fraction. On the other hand, non-sea salt SO42-, which exists as sulfur oxides in the atmosphere, was in the S-fraction. The back trajectory of the air mass for L-I passed through northeast and central China. These results suggest that PAHs long-range transported from China to Japan precipitated in snow at Mt. Tateyama. In the melted snow, PM-associated PAHs in the atmosphere were mainly in the P-fraction, but in the case of lower molecular PAHs, partly in the S-fraction. While gas phase PAHs were in the S-fraction. The high concentration of non-sea salt Ca2+ in the S-fraction of L-I suggests that this layer contained Asian dust.


Snow, Long-range transported particulate matter Polycyclic aromatic hydrocarbon Inorganic ion Mt. Tateyama

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