İlker SERT

Pb ile Tarihlemede Modifiye Sabit Akı Modelinin Göl Sedimentlerine Uygulanması ve Bazı Ağır Metallerin Değerlendirilmesi

Bu çalışmada, Kurşun-210 (Polonyum-210) aktivite konsantrasyonları alfa spektroskopisi kullanılarak dolaylı olarak elde edilmiştir. Sediment kronolojisi modifiye CRS modeli kullanılarak belirlenmiştir. Ortalama sediment birikim hızları S-1, S-2, S-3 istasyonlarında sırasıyla 0.351, 0.324, 0.222 g cm-2 y-1 dır. Atmosferik 210Pb akısı (29 mBq cm-2 y-1)’na göre Karagöl, havzasından ekstra dış girdiye (toprak erozyonu) sahiptir. Ağır metal konsantrasyonları Zenginleşme Faktörü (EF) bakımından antropojenik değerlerin altındadır. Dolayısıyla Au hariç elementlerin karasal kaynaklardan meydana geldiği söylenebilir. Beklenmedik biçimde Au, Karagöl’ün kuzey istasyonunda (S-1) çok yüksek EF değerine (58.22) sahiptir. Bu değer, 2004’ten günümüze kadar olan zaman dilimine karşılık gelmektedir. Ancak Kirlilik Yük İndeksi (PLI) durumun EF değerlerinden çıkan sonuçtan farklı olduğunu söylemektedir. PLI değeri, Karagöl’ün kuzey kısmında kirleticilerin sadece baz seviyesine sahipken Karagöl’ün güney kısmı için bölgenin ilerleyici bozunma aşamasında olduğunu göstermektedir.

Applying of Modified Constant Rate of Supply Model to Lake Sediments in 210Pb Dating and Assessment of Some Heavy Metals

In present study, Lead-210 (Polonium-210) activity concentrations wereindirectly obtained by utilizing alpha spectrometry. Sediment chronology wasdetermined by using modified CRS model. Average sediment accumulation ratesare 0.351, 0.324, 0.222 g cm-2 y-1 in S-1, S-2, S-3 stations respectively. Withreference to atmospheric 210Pb flux (29 mBq cm-2 y-1) Lake Karagöl has extra outer210Pb input (soil erosion) from the catchment area. In terms of Enrichment Factor(EF), heavy metal concentrations are lower than the anthropogenic values. So itcan be said that the elements except Au originate from the continental supply. Auhas unexpectedly too high level EF value (58.22) in northern station (S-1) of theLake Karagöl. It corresponds to time interval from 2004 to nowadays. HoweverPollution Load Index (PLI) says different consequences from the EF values. PLIvalue has only baseline levels of pollutants in northern part of the Lake Karagöl asit shows progressive deterioration of the site for southern part of the Lake Karagöl.

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