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[C-1.1.2 Development of Sequential Automated Sampling and Analytical Method for Peroxyacyl Nitrates and Elucidation of Their Distribution in the Ambient Air]

[Contact Person]

Ikuo WATANABE
Section Chief
Dept. Community Environmental Sciences
Inst. of Public Health
Ministry of Health and Welfare
4-6-1 Shirokanedai, Minato-ku, Tokyo 108 Japan
Phone +81-3-3441-7111(Ext.325), Fax +81-3-3446-4314

[Total Budget for FY1993-1995]

19,699,000 Yen (FY1995 6,540,000 Yen)

[Abstract]

　The methods of sampling, carrying and keeping, and the instruments for the measurement of atmospheric peroxyacetyl nitrate(PAN) and peroxypropionyl nitrate(PPN), are developed for field studies at remote sites and by aircraft. The developed methods were used for the field studies at four remote islands and by an aircraft since 1991. PAN and PPN were detected in most of over 500 samples. Mean concentrations of PAN and PPN in the islands and in lower troposphere over Yellow Sea to Japan Sea are 0.1-0.4 ppb(v/v) and 0,01-0.03 ppb, respectively. Good correlation between PAN and PPN at the each point was observed and PPN was found to be 5-9% of PAN. The relationship of PANs and NOx were also investigated and the ratios of PANs to NOx were found to be 20-30% mostly and to exceed 50% occasionally in upper 2500m altitude.

[Key Words]

Sampling Techniques, Sampling Instrument, Remote Sites, Lower Troposphere, Peroxyacetyl Nitrate, Peroxypropionyl Nitrate