Comparison of Some Radionuclides in the Marine Coastal Environment of the Black Sea and the Mediterranean
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Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, Bulgaria
Alexander S. Strezov   

Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, Sofia 1784, blvd. Tzarigradsko shosse № 72
Online publication date: 2007-10-01
Publication date: 2007-10-01
Eurasian J Anal Chem 2008;3(1):170–182
Ten types of sea algae distributed along the Bulgarian coast have been collected and analyzed for radioactivity content in the period 1996 - 2004. Results have shown that 37Cs concentrations in all analyzed samples were relatively low (less than 10 Bq kg-1 dry weight) while the levels of naturally occurring radionuclides, such as 226Ra and 210Pb, were found to be higher in most samples; the highest observed value (896 Bq kg-1 dry weight for 226Ra and 68 Bq kg-1 for 210Pb was in the green Bryopsis plumosa alga. In addition, most alga species were also found to accumulate 210Pb, which indicates their selectivity to this isotope. On the other hand, brown algae (Cystoseira barbata & crinita) have shown a clear selectivity for some nuclides, this selectivity may encourage their use as a biomonitor for pollution by nuclides. Moreover, the red alga species were found to contain the highest levels of Cs. The coastal areas far from rural settlings were chosen as control sites to evaluate soluble and total metal concentrations and to gain additional information on both the environmental conditions of the area and possible bioaccumulation patterns. Data from this study were also compared with those previously obtained from neighboring Mediterranean Sea. The results clearly show differences between these two marine ecosystems. Nuclide concentrations recorded along the Bulgarian coast may be used for background levels for intraspecific comparison within the Black Sea area, which information is still very scarce.
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