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Whether or not accumulation phenomena of copper (Cu2+), manganese (Mn2+), zinc (Zn2+) and cadmium (Cd2+) ions by the egg of medaka Oryzias latipes were represented as the Langmiur's adsorption isotherm was studied. The amounts of these heavy metals accumulated by the eggs reached stable levels, depending on the exposure concentrations within 24 to 48 hours. The contents at equilibrium for each heavy metal in the eggs were represented as function of their ambient concentrations. The defined equation of this relationship corresponds to the Langmiur's adsorption isotherm. Cd2+ had the strongest binding affinity to the eggs, followed by Zn2+, Cu2+, and Mn2+. The maximum amounts of heavy metals accumulated by the eggs ranged from 5.0 to 8.2 nmole/egg. The accumulated heavy metals were mostly bound to the egg membrane, while a lesser amount contained in the interior parts of the egg. Thus, accumulation of these heavy metals by the eggs could be explained as the sorption phenomenon characteristic to the simultaneous occurrence of the adsorption to the egg surface and the absorption into the interior parts of eggs.

Aspects of accumulation of copper, manganese and zinc ions in the egg of medaka Oryzias latipes.