Temporal evolution of lead isotope ratios and metal concentrations in sediments of the north Aegean Sea, in Turkish coast


SERT İ.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, cilt.317, ss.825-840, 2018 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 317 Konu: 2
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s10967-018-5947-5
  • Dergi Adı: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Sayfa Sayısı: ss.825-840

Özet

In present research, fifteen surficial and two profile sediment samples were studied in terms of sediment chronology and pollution degree on the ground of pollution indexes such as enrichment factor (EF), contamination factor (CF), Pollution Load Index (PLI) and lead isotope ratios (Pb-206/Pb-207, Pb-208/Pb-206). Lead-210 (polonium-210) activity concentrations were measured by utilizing alpha spectrometry. Sediment chronology was determined via modified CRS mathematical model. Average mass accumulation rates are 0.301 and 0.227 g cm(-2) year(-1) in BakA +/- r double dagger ay River mouth and AyvalA +/- k offshore stations respectively. Mass accumulation rates do not display the systematic increases along the cores from bottom layers to top layers. In BakA +/- r double dagger ay River mouth station Pb-210 flux is higher than the range of global atmospheric Pb-210 flux value. Due to the high CF and EF values of Sr both of stations have hydrothermal features. AyvalA +/- k offshore station has displayed Na, Cd pollution since 1945, but Na, Cd, As, Mo, Ag pollutions have existed in BakA +/- r double dagger ay River mouth station since 1983 in terms of CF and EF values. According to PLI index, BakA +/- r double dagger ay River mouth station has "starting level pollution" degree and it displayed an "acute corruption" in 1981. Pb-206/Pb-207 ratios range from 1.17 to 1.25, Pb-208/Pb-206 ratios range from 1.99 to 2.16 in study area. When Pb-206/Pb-207 and Pb-208/Pb-206 ratios are evaluated with together, it is seen that both of the stations have had the natural (geologic) sediments since 2011.