Bio-accumulation of210pb and210po within the trophic level of phytoplankton-zooplankton-anchovy-mackerel in the coastal water of the Jeju Island, Korea

Abstract

The activity concentrations of210Po and210Pb within phytoplankton-zooplankton-anchovy-mackerel in the coastal water of the Jeju Island were determined to understand their distribution and bio-accumulation along the trophic level. In the surface water, the total activity concentrations of210Po and210Pb were 0.83 ± 0.004 mBq kg-1 and 1.27 ± 0.03 mBq kg-1. And the dissolved activity concentration of210Po and210Pb were 0.75 ± 0.06 mBq kg-1 and 1.22 ± 0.09 mBq kg-1 respectively. In the phytoplankton, the concentration factor (CF) of210Po and210Pb were 1.5 × 105 and 2.6 × 104 shows210Po is 5 times higher compared to210Pb. The similar CF factor in the zooplankton of210Po was derived as 1.4 × 105. The CF of210Po in anchovy was increased twice compared to that in plankton. This is the evidence that there is210Po bio-magnification in the trophic level of plankton-anchovy. However the210Po activity concentration in the muscle tissue of mackerel was one-hundred times lower than that in anchovy. This reflects that in the trophic level of anchovy-mackerel, the bio-accumulation of210Po is decreased. The activity concentrations of210Po in the internal organs of anchovy and mackerel were 8 to 38 times higher than those in muscle tissues. In phytoplankton-zooplankton-anchovy, the CF of210Pb was decreased five times along the trophic level in order. In anchovy-mackerel it was decreased by 30-70%. © 2016, Korea Ocean Research and Development Institute. All rights reserved.