Sediment Phosphorus Mechanism in Aquatic Ecosystems

Yıl 2018, Sayı: 365, 45 - 52, 30.12.2018

Akasya Topçu , Serap Pulatsü

https://doi.org/10.33724/zm.476134

Öz

Sediment phosphorus sorption is the key mechanism used in the sediment-water phosphorus dynamic and mobility in aquatic environments. This mechanism comprises a process for sediment phosphorus adsorption and desorption. Estimation of sediment phosphorus ratio longevity has priority in the determination of sediment pollution and lake management applications. Some developed equations are generally used in the sediment phosphorus adsorption and desorption mechanism. Freundlich ve Langmiur isotherms, based on experimental study, are frequently used. Equilibrium phosphate concentration (EPC0) defined as the equilibrium between adsorption and desorption in aquatic systems is commonly used to assess the potential for sediment to uptake or release phosphate prior to the reduction in external phosphate source. This study examines the estimation of some equations used in the sediment phosphorus sorption and the effective physico-chemical parameters.

Anahtar Kelimeler

Phosphorus fractions, phosphate sorption, sediment, shallow lake

GÖL EKOSİSTEMLERİNDE SEDİMENTTE FOSFOR SORPSİYON MEKANİZMASI

Öz

Sucul sistemlerde sedimentteki fosfor sorpsiyonu,
sediment-su arası fosfor dinamiği ve hareketliliğinin belirlenmesinde
kullanılan ana mekanizmadır. Bu
mekanizma sedimentte fosforun adsorpsiyon ve desorpsiyon süreçlerini kapsar. Sedimentte
uzun dönemli fosfor adsorpsiyon oranınının tahmini ise fosfor kirlenmesi ve göl
yönetim uygulamalarının belirlenmesi açısından önem taşımaktadır. Sedimentteki adsorpsiyon-desorpsiyon olaylarını açıklamak için
geliştirilmiş birçok eşitlik bulunmaktadır. Deneysel çalışmalara dayanan bu
eşitliklerden Freundlich ve Langmiur izotermleri, sıklıkla kullanılmaktadır. Sucul sistemlerde
sediment-sediment üstü su arası adsorpsiyon ve desorpsiyon değerlerinin
birbirine eşit olması olarak tanımlanan denge fosfat konsantrasyonu (EPC₀);
dış kaynaklı fosfor yüklemesindeki azalmayı takiben, iç kaynaklı yükleme
potansiyelinin belirlenmesi ya da fosfor salınım ve/veya tutulum düzeyinin
tespiti için kullanılan önemli bir parametredir. Bu çalışmada farklı sucul
sistemlerde sediment fosfor sorpsiyonu tahmininde kullanılan bazı eşitlikler ele
alınmış ve sorpsiyonda etkili fiziko-kimyasal parametreler özetlenmiştir.

Anahtar Kelimeler

Sediment, sığ göl, fosfat sorpsiyon özellikleri, fosfor fraksiyonları

Kaynakça

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