Researcher:
Sıkdokur, Ercan

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PhD Student

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Ercan

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Sıkdokur

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Sıkdokur, Ercan

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2021 - 20222

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Researcher Of Publications: search.filters.isAuthorOfPublication.efa491a6-380f-47d8-9097-b87f46d3bc0b

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    Microplastic inventory in sediment profile: a case study of Golden Horn Estuary, Sea of Marmara
    (Elsevier, 2021) Belivermiş, Murat; Kılıç, Önder; Sezer, Narin; Güngör, Nihal Doğruöz; Altuğ, Gülşen; N/A; Sıkdokur, Ercan; PhD Student; Graduate School of Sciences and Engineering; N/A
    Assessment of microplastics (MPs) in sediment cores is necessary to unveil global plastic pollution since most of the plastic litter might have been stored in sediment columns. In the current study, MPs inventory was determined in a 105 cm sediment core, collected in the Golden Horn Estuary, Sea of Marmara. Radiodating of sediment profile by using naturally occurring Pb-210 and fission product Cs-137 allowed us to couple the retrospective of global MP production to sediment MPs inventory. More than 90% of total MPs inventory was found in the deep layer of the sediment column (below 15 cm). Small MPs (20-200 mu m) were more abundant than large ones (200-4000 mu m). Elevated concentrations of MPs were attributed to industrial and municipal effluent of Istanbul metropolitan. on a local scale, this study suggests that the Golden Horn Estuary was polluted with MPs before the 1950s, and the abundance of MPs reached a maximum in the 1980s. We also propose on a global scale that "the missing" plastics might have been buried in deep sediment and radiodating of sediment is useful to reveal their historical input records.
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    Chronology of trace elements and radionuclides using sediment cores in Golden Horn estuary, Sea of Marmara
    (Elsevier, 2022) Gozel, Furkan; Belivermiş, Murat; Sezer, Narin; Kurt, Mehmet Ali; Kılıc, Önder; N/A; Sıkdokur, Ercan; PhD Student; Graduate School of Sciences and Engineering; N/A
    Trace elements and radionuclides are substantial pollutants in marine environment since they are nonbiodegradable and can be harmful even in minute concentrations. The Golden Horn estuary, where is an inlet of Bosphorus and two creeks, has been seriously polluted by untreated municipal and industrial dischargers for several decades. Since 1998, a large restoration and rehabilitation efforts have been undertaken in the estuary to mitigate the pollution. In the present study, four sediment cores were taken from the Golden Horn estuary to assess the historical accumulation of trace elements and radionuclides. Radiometric dating was implemented by 210Pb and 137Cs radionuclides and CRS model. Sedimentation rates were calculated in the range of 0.92-0.97 cm yr 1 in the estuary. The distribution of radionuclides (40K, 226Ra, and 228Ra) indicated some slight variations which ascribes to the geological characteristics of sediment along the cores. The concentrations of the anthropogenic elements were relatively higher in the intensive industrialization period. Their concentrations reduced in the latest 15-20 years thanks to the large-scale rehabilitation project in the estuary. The pollution indices, namely EF, Igeo, CF, and PLI showed that the concentrations of Cd, Cr, Cu, Pb, Sb, and Sn were above the world averages. Our results provide an insight on the long-term accumulation trends of trace element in the Golden Horn, which revealed that the estuary remains moderately polluted. We suggest that preventive countermeasures are much more important than post pollution remediation in the case of metallic pollution in the estuaries.