İzmir'deki yağışların kimyasal kompozisyonunun saptanması

The major aim of this thesis is to determine the chemical nature of the rainwater in İzmir atmosphere. To achieve determining chemical character of rainwater samples are collected at five stations in İzmir and these studies are conducted by the collaboration between İzmir Regional Meteorological Office and Department of Environmental Engineering of Dokuz Eylül University. Sample collections are done by personnel of meteorological offices and analyses are done in Dokuz Eylül University Environmental Engineering Department Laboratories. The chemical properties of the rainwater are determined as pH, elemental and anionic concentrations of the samples. The selected anions are SO42-, NO3-, Cl-, F-, Br-, NO22-, PO43-, and the elemental types are Al, Ba, Ca, Cd, Zn, Cr, Pb, Sr, V, K, Mn, Mg, Na, Ni, Cu, Co, Fe. Measurement results are exposed to some statistical methods in order to obtain significant relations between acid causing ions and other chemical parameters. The results of these statistical analyses are used for the explanation of possible contributing sources in İzmir atmosphere. By the highlights of these studies, mean pH value of wet deposition for İzmir atmosphere was determined as 6.1. It is found that 94 % of the pH values are above 5 that are measured in the sampling period, and neutralising process of the acidity of precipitation acidity is achieved by high alkali ion concentrations with respect to local geographic properties. Trace element concentrations are similar to previous studies in the literature. The increase in the concentrations of trace metals in the atmosphere of the region is related to the consumption of fuels in urban areas, industrial activities, and long range transport of chemical components especially with air masses from Europe. As İzmir is located in the Aegean shoreline, marine originated chemical components have important effect on the composition of precipitation as expected.