Mogan Gölü (Türkiye)’nde Sediment Tarama Etkinliğinin Sediment Üstü Su ve Sediment Gözenek Suyu Ağır Metalleri Bağlamında Değerlendirilmesi

Year 2022, Volume: 18 Issue: 1, 38 - 48, 01.03.2022

Arzu Binici , Serap Pulatsü

https://doi.org/10.22392/actaquatr.942961

Cited By: 1

Abstract

Ötrofikasyon riski altındaki sucul sistemlerin rekreaktif değerlerinin de artırılmasına yönelik bir yönetim aracı olan dredging, Mogan Gölü’nde uygulanmıştır. Bu çalışmada Mogan Gölü’nde sediment tarama ertesi; a) Sediment üstü su (SÜS) ve sediment gözenek suyunda (SGS) ağır metal konsantrasyonlarının (Hg, As, Cd, Cr, Pb, Ni, Cu ve Zn), b) SGS’de bazı ağır metallerin (Cu, Ni, Pb, Zn) toksisitesinin belirlenmesi amaçlanmıştır. Bu amaçla 2020-Mayıs ve Kasım aylarında iki istasyondan (Özellikle maden işleme tesisleri ve evsel kaynaklı atık suların ulaştığı I. istasyon; Evsel, endüstriyel atıklar ile tarımsal faaliyet kaynaklı atık suların ulaştığı II. istasyon) SÜS ve SGS eldesi için de yüzey sedimentleri örneklenmiştir. Bulgular doğrultusunda; a) Çalışma periyodunca Zn en yüksek, Pb ise diğer metallere göre daha düşük değerlerde seyretmiştir. SÜS verileri ‘Su Kirliliği Kontrolü Yönetmeliğinde’ verilen limit değerler içerisinde bulunmuştur. SGS-Zn; mayıs-II. istasyonda (330.50±8.72 µg L-1) ve SGS-Cu; kasım-II. istasyonda (12.85±4.35µg L-1) pore water için önerilen (WQC) limit değerleri aşmıştır, b) SGS-Ni, Cu, Zn ve Pb’ya ilişkin IWCTU (Interstitial Water Criterion Toxic Units) ile NI değerleri, 1’den büyük bulunmadığı için, dört metal açısından gölde ciddi bir kirlenme olmadığı, ancak Zn’un toksik etki riskine sahip en potansiyel metal olduğu belirlenmiştir. Ayrıca toplam IWCTU ve NI verileri, mayıs ayında metallerin toksisite ve toksisite derecesinin arttığına işaret etmektedir. Mogan Gölü’nde genel olarak SGS-ağır metal konsantrasyonlarının SÜS’e ilişkin değerlerden daha yüksek saptanması, sedimentin metalleri kuvvetlice adsorbladığını ve tarama girişiminin en azından yüzey sedimentinin ağır metal düzeyleri bağlamında çok etkin olmadığını ortaya koymuştur.

Keywords

Sediment tarama, sediment üstü su, sediment gözenek suyu, ağır metal, Mogan Gölü

Supporting Institution

Ankara Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü

Project Number

19L0447010

Thanks

Bu projenin (19L0447010) gerçekleştirilmesi için gerekli mali desteği sağlayan Ankara Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü’ne şükranlarımızı sunarız.

Assessment of Sediment Dredging Effectiveness by Considering Overlying Water and Pore Water Heavy Metals in Lake Mogan, Turkey

Abstract

Dredging, a practice intended to increase the recreational value of aquatic systems at risk of eutrophication, has been implemented in Lake Mogan. This study aimed to determine a) Heavy metal concentrations (Hg, As, Cd, Cr, Pb, Ni, Cu, and Zn) in the overlying water and sediment pore water, and b) Pore water toxicity levels of some of these metals (Cu, Ni, Pb, Zn) following dredging in Lake Mogan. Surface sediment samples were taken from two stations in the lake between May and November 2020 to obtain overlying water and pore water values. The first station was chosen specifically because it receives wastewater from mineral processing facilities and nearby households; and the second station. After all, it receives household and industrial waste and agricultural wastewater. The findings indicate that a) Zn had the highest concentrations during the study period, and Pb the lowest. Overlying water concentrations were found to be within the acceptable limits outlined by the “Water Quality Control Regulations”. Pore water Zn concentrations for May (330.50±8.72 µg L-1) and pore water Cu concentrations for November at the second station (12.85±4.35 µg L-1) were higher than the recommended WQC limits. b) Since no values greater than 1 were found in the pore water for IWCTU (Interstitial Water Criterion Toxic Units) and NI (Nemeraw index) values for Ni, Cu, Zn, and Pb, no serious levels of pollution were present for these four metals; however, Zn had the greatest potential risk of toxicity. Moreover, the total IWCTU and NI values indicate that both the toxicity of the metals and the degree thereof increased in May. The fact that pore water heavy metal concentrations in Lake Mogan were generally higher than those in the overlying water indicates strong metal adsorption in the sediment and suggests that, at least in terms of reducing surface sediment heavy metals, dredging activities in the lake are not very effective.

Keywords

Sediment dredging, overlying water, pore water, heavy metal, Mogan Lake

Project Number

19L0447010

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