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[C-1.1.2 Development of Screening and Analysis Method for Precipitation Data Sets]

[Contact Person]

Hiroshi Hara
Department of Community Environmental Sciences
The Institute of Public Health
Ministry of Health and Welfare
Shirokanedai 4-chome, Minato-ku Tokyo 108 Japan
Phone +81-3-3441-7111(Ext.326), Fax +81-3-3446-4314

[Total Budget for FY1991-1992]

10,328,000 Yen

[Abstract]

　Three approached were made for data evaluation and source estimation of acid deposition. 1) A normal distribution theory was applied for formulating the basis for ion balance screening. Experimentally determined parameters in the formular enabled us to predict the probable ranges for ion balance, 2) Probable errors associated pH measurement with glass-electrode was evaluated on the basis of both theory and experiments, and 3) SLS method was modified to precipitation chemistry data analysis. This method was further applied to datasets for two sites on Japan Sea coast, Iwamizawa and Yoshinotani to predict the numbers of main sources and their chemical compositions, which will provide a very useful tool for source analysis without any information on source chemistry.

[Key Words]

Ion Balance, Precision, pH, sources, sulfate, Japan Sea