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[C-1.2.3 Development of Sampling and Analytical Method for Peroxyacyl Nitrates and Related Compounds at Low Concentration in the Air]

[Contact Person]

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

[Total Budget for FY1990-1992]

16,430,000 Yen

[Abstract]

　Peroxyacyl nitrates(PANs), such as peroxyacetyl nitrate(PAN) and peroxypropionyl nitrate(PPN), are important components of tropospheric reactive-N and potential carriers of global NOx. Atmospheric measurements of PANs in remote sites, however, are rare and are virtually non-existent in Asian region.
　The methods and the instrument of sampling, carrying and keeping for atmospheric PANs with dryice-ethanol and pulverized-dryice are developed for field studies at remote sites and by aircraft. They were used for the field studies at Tushima Is. and Oki Is., and for aircraft study. PAN and PPN were detected in all of the 129 samples. Good correlations were observed between PAN and PPN for all samples, and PANs and NOx in aircraft survey. From aircraft survey, the slopes of the regression lines of PAN/NOx for upper 2000m altitude were higher than those for lower 1300m altitude. PANs are considered to be the potential carriers of global NOx in the background area.

[Key Words]

East Asia, Nitrogen cycle, Nitrogenous compounds, PAN, PPN