engleski

Descriptive and multivariable analysis of heavy metals and acidic components in total deposited matter of air in the Split, Croatia

The results of a 5-year monitoring study of air pollution in the city of Split area are presented and evaluated statistically with descriptive and multivariable analysis. Heavy metals Cd, Pb, Tl, cation Ca2+ and anions SO42- and Cl- were measured in the total deposited matter (TDM) for the period of 2003. - 2007. Basic statistical analysis of the measured values was calculated for each parameter. Statistical analyses show the highest average value for Pb, Cd, Tl of 74.80 ; 1.90 and 1.80 g m-2 day-1 in the industrial zone, respectively, while the values of Ca2+, SO42- and Cl- were 37.90 ; 14.50 and 24.00 mg m-2 day-1. The analysis shows correlations between individual variables, which are explained by the position and the significance of each location. The locations in which industry and traffic are significant factors show a strong correlation between Pb and Cd concentrations, while at tourist locations and those along the coast there is strong correlation between SO42- and Cl-. Furthermore, principal component analysis (PCA) shows that two major components describe about 70 % of the data variance at almost all locations. For all locations factor analysis for individual variables was done and groups, corresponding to the position and significance of the location were obtained. The results of PCA analysis will be used as driving parameters for air modelling with the aim of simulating its behavior, which can result in reliable forecasts. Obtained forecast can be used for operational air quality management in tourist region of Croatia.

deposition matter; heavy metals; statistical analysis; principal component analysis

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