Aliağa ağır sanayi bölgesinde yarı-uçucu toksik organik hava kirleticileri üzerine bir çalışma

Ambient air, dry deposition, and soil samples were collected during the summer and winter periods at a sampling site close to the Aliaga industrial region in Izmir, Turkey. Soil samples were also taken from additional 48 different sites around the study area. All samples were investigated for SOCs (PAHs, PCBs, and OCPs). Atmospheric PAH concentrations were higher in winter than in summer, indicating that wintertime concentrations were affected by residential heating emissions. On the contrary, increased atmospheric PCBs and OCP levels were observed in summer, probably due to increased volatilization at higher temperatures and seasonal agricultural applications of in-use pesticides. Low molecular weight PAHs (phenanthrene, fluorene, fluoranthene) and PCBs (tri-, tetra-, penta-CBs) were the most abundant compounds in air for both seasons. For OCPs, they were endosulfan-I, endosulfan-II and chlorpyrifos in summer, and chlorpyrifos, ?-HCH, and endosulfan-I in winter, respectively. In contrast to PCBs, particulate fluxes of PAHs and OCPs were generally higher in summer than in winter. Overall average deposition velocities calculated for SOCs agree well with the literature values. Calculated net gas fluxes at the soil-air interface indicated that the contaminated soil is a secondary source to the atmosphere for lighter PAHs and PCBs and as a sink for heavier ones. OCPs tending to volatilize were chlordane related compounds and p,p'-DDT in summer, and in winter, they were ?-CHL, ?-CHL, t-nonachlor, endosulfan sulfate, and p,p'-DDT. All mechanisms were comparable for the studied compounds, but their input was generally dominated by gas absorption, followed by dry and wet deposition.