İSTANBUL’DA KIŞ HAVA ŞARTLARINDA ATMOSFERİK ORGANOKLORLU PESTİSİT SEVİYELERİ VE GAZ/PARTİKÜL DAĞILIMLARI

Bu çalışmada, İstanbul'un kentsel bir yerleşim bölgesinde gaz ve partikül fazında ortam havası organoklorlu pestisit (OCP) seviyeleri araştırılmıştır. Örnekler, kış aylarında on dört gün boyunca yüksek hacimli örnekleyici kullanılarak toplanmıştır. Bireysel OCP konsantrasyonları partikül fazı için 13 ila 593 pg.m-3 ve gaz fazı için 14 ila 1.748 pg.m-3 arasında değişmiştir. Gaz ve partikül fazlarındaki her OCP'nin ortalama konsantrasyon toplamı sırasıyla 3,219 ve 2,746 pg.m-3 olarak tespit edilmiştir.δ –HCH’nin en yüksek bireysel konsantrasyona sahip olduğu gözlemlenmiştir. DDT'lerin bulunma oranları şu sırada olduğu görülmüştür: 4.4'-DDT> 4.4'-DDD> 4.4'-DDE. Σ (gaz + partikül) OCP konsantrasyonları 1,845 ila 10,196 pg.m-3 arasında değişim göstermiştir. Yüksek konsantrasyonların gözlemlendiği günlerde hava kütlelerinin yörüngeleri HYSPLIT modeli ile incelenmiştir.Gaz/partiküldağılımınınakıbetini belirlemek üzere logKp-logPL0 modeli uygulanmıştır.Regresyon eğrisinin ortalama eğimi -0.35 iken, kesim noktası -2.89 olarak bulunmuştur.

Anahtar Kelimeler:

OCP, kış, gas/partikül dağılımı

Atmospheric Organochlorinated Pesticide Levels and Gas/Particle Partitioning in Istanbul during Winter Weather Conditions

In this study, gas and particle phase ambient organochlorine pesticide (OCP) levels were investigated atan urban site in Istanbul. Samples were collected by a high-volume sampler for fourteen days in winter. Individual OCP concentrations were between13 and 593 pg.m-3 for particle phase and 14 and 1,748 pg.m-3 for gaseous phase. The sums of the average concentration of each OCP in gaseous and particle phases were 3,219 and 2,746 pg.m-3, respectively. δ-HCH had the highest individual concentration. The abundance of DDTs followed the order 4.4'-DDT > 4.4'-DDD > 4.4'-DDE.The Σ(gas+particle)OCP concentrations ranged between 1,845 and 10,196 pg.m-3. On the days when high concentrations were observed, the trajectories of air masses were investigated by the HYSPLIT model. logKp versus logPL0 model was applied in order to determine the fate of gas/particle partitioning. The average slope of the regression line was -0.35, whereas the intercept was -2.89.

Keywords:

OCP, winter, gas/particle partitioning,

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