Regional Extent and Relative Proportions of Different Metal Emissions in Helsinki Air Studied by the Moss-Bag Technique

摘要

Heavy metal pollution of Helsinki air was studied in the wintertime 1982-83 with a moss-bag technique. Special attention was paid to the most important emission sources: refuse burning, traffic of motor vehicles and energy supply. Accumulation of ash, Cd, Cr, Cu, Fe, Pb, Ni, V and Zn in moss bags over a five-months period was studied and analysed with a standard AAS flame method. Greatest accumulation values were found near a refuse burning plant in leeside and near the main streets with daily traffic intensity of 30,000 to 50,000 vehicles. Also the influence of coal-fired power plant into a city center was remarkable concerning especially ash, Ni and V. The relative proportions of different emission sources were also estimated by means of a factor analytic receptor model for the whole material as well as for the representative subareas separately. Three major facts emerge and correspondingly the chemical parameters studied can be divided into three separate groups. The first one named traffic factor includes Fe, ash, Pb and Cr. The second one named energy factor includes V and Ni and on the third, incinerator factor, Cd and Zn show significant loadings. (ERA citation 11:014457)