제주도 근해 식물플랑크톤-동물플랑크톤-멸치-고등어 영양단계에서 210 Pb과 210 Po의 생물농축

Abstract

The activity concentrations of 210 Po and 210 Pb 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 of 210 Po and 210 Pb were 0.83 ± 0.004 mBq ㎏ −1 and 1.27 ± 0.03 mBq ㎏ −1 . And the dissolved activity concentration of 210 Po and 210 Pb were 0.75 ± 0.06 mBq ㎏ −1 and 1.22 ± 0.09 mBq ㎏ −1 respectively. In the phytoplankton, the concentration factor (CF) of 210 Po and 210 Pb were 1.5 × 10⁵ and 2.6 × 10⁴ shows 210 Po is 5 times higher compared to 210 Pb. The similar CF factor in the zooplankton of 210 Po was derived as 1.4 × 10⁵. The CF of 210 Po in anchovy was increased twice compared to that in plankton. This is the evidence that there is 210 Po bio-magnification in the trophic level of plankton-anchovy. However the 210 Po 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 of 210 Po is decreased. The activity concentrations of 210 Po 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 of 210 Pb was decreased five times along the trophic level in order. In anchovy-mackerel it was decreased by 30−70%.