The history of the sedimentation processes and heavy metal pollution in the Central Danube Delta (Romania)

• Autorzy: Begy R. C. , Kelemen S. , Simon H. , Tănăselia C.

Identyfikatory

DOI

10.1515/geochr-2015-0090

• Języki publikacji: EN

Abstrakty

EN

The aim of this study was to investigate the effects of the Iron Gates (IG) hydroelectric power station on the Danube Delta sediment dynamics, and to assess the heavy metal concentrations and pollution in a typical Central Danube Deltaic lake. Eight sediment cores were analysed. The total 210Pb content was measured with 210Po using alpha spectrometry, and the supported 210Pb (226Ra) and 137Cs were measured by gamma spectrometry. The age depth model was derived by applying the 210Pb dating method, and for the calculation of the ages and the sedimentation rates the CRS model was used. The sedimentation rates can be divided into four periods:1940–1972, 1972–1980, 1972–1989 and 1989–2013. In the case of Lake Iacob in the first period, the average sedimentation rate was 0.418 g/cm2y, while in the second it slowly decreased to 0.376 g/cm2y. In the third period, the sedimentation fell to 0.209 g/cm2y, which means the retention of 27.3% of the sediment by the IG dam. In the case of Lake Isac the changes were more visible: in the first period the average sedimentation rate was 0.446 g/cm2y, while in the second it decreased to 0.197 g/cm2y, which means a 42.35% retention of sediment. In the last period, in both cases, a high increase in the sedimentation rate is shown: 0.677 g/cm2y for Lake Iacob and 0.715 g/cm2y for Lake Isac. The heavy-metal concentrations for As, Co, Cr and Ni show decreasing and Hg increasing tendencies, while Cd and Pb show constant values of 310 ± 12 ppb and 9 ± 1 ppm respectively.

Słowa kluczowe

EN

geochronology; 210Pb (210Po) dating method; sediment dynamics; heavy metals

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2018
• Tom: Vol. 45, no. 1
• Strony: 97--106
• Opis fizyczny: Bibliogr. 29 poz., rys.

Twórcy

autor

Begy R. C.

• Babeş-Bolyai University, Faculty of Environmental Science and Engineering, Fântânele 30, 400294,Cluj-Napoca, Romania
• Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeş-Bolyai University, Treboniu Laurean 42,400271 Cluj-Napoca, Romania

autor

Kelemen S.

• Babeş-Bolyai University, Faculty of Environmental Science and Engineering, Fântânele 30, 400294,Cluj-Napoca, Romania

autor

Simon H.

• Babeş-Bolyai University, Faculty of Environmental Science and Engineering, Fântânele 30, 400294,Cluj-Napoca, Romania

autor

Tănăselia C.

• INCDO-INOE 2000 Research Institute for Analytical Instrumentation (ICIA), Cluj-Napoca, Romania

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).