Long term trends in atmospheric concentrations of polycyclic aromatic hydrocarbons and nitropolycyclic aromatic hydrocarbons: A study of Japanese cities from 1997 to 2014

Environmental Pollution
Kazuichi HayakawaHitoshi Kakimoto

Abstract

Total suspended particulate matter (TSP) was collected during the summer and winter in five Japanese cities spanning Hokkaido to Kyushu (Sapporo, Kanazawa, Tokyo, Sagamihara and Kitakyushu) from 1997 to 2014. Nine polycyclic aromatic hydrocarbons (PAHs) with four to six rings, including pyrene (Pyr) and benzo[a]pyrene (BaP), were identified using high-performance liquid chromatography (HPLC) with fluorescence detection. Two nitropolycyclic aromatic hydrocarbons (NPAHs), 1-nitropyrene (1-NP) and 6-nitrobenzo[a]pyrene (6-NBaP), were identified by HPLC with chemiluminescence detection. A comparison of PAH and NPAH concentrations and [NPAH]/[PAH] ratios such as [1-NP]/[Pyr] and [6-NBaP]/[BaP] revealed the following characteristics in the five cities: (1) In Sapporo, Kanazawa, Tokyo and Sagamihara, the concentrations of PAHs and NPAHs were high at the beginning of the sampling period and then steadily decreased, with NPAHs decreasing faster than PAHs. The large initial [1-NP]/[Pyr] ratios suggest that the major contributor was automobiles but subsequent decreases in this ratio suggest decreased automobile contributions. (2) By contrast, PAH concentrations in Kitakyushu did not decrease during the sampling period, though concentratio...Continue Reading

Citations

Jan 12, 2019·Environmental Science. Processes & Impacts·Seong-Joon KimSung-Deuk Choi
Mar 17, 2019·International Journal of Environmental Research and Public Health·Egide KalisaDonnabella Lacap-Bugler
Jan 16, 2020·International Journal of Environmental Research and Public Health·Kazuichi HayakawaHae-Young Chung
Feb 6, 2020·International Journal of Environmental Research and Public Health·Tetsuya MatsunakaKazuichi Hayakawa
Feb 20, 2020·International Journal of Environmental Research and Public Health·Takashi KuboYuji Takao
Mar 13, 2020·Proceedings of the Japan Academy. Series B, Physical and Biological Sciences·Tatsuhiro MoriYutaka Kondo
Jan 30, 2020·Nature Microbiology·Stephen D J Archer, Stephen B Pointing
Aug 31, 2019·Scientific Reports·Kaori MiuraShiro Hatakeyama
Oct 24, 2018·Environmental Science & Technology·Egide KalisaDonnabella C Lacap-Bugler

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