The copper complexing ability of extracellular organic compounds produced by Microcystis aeruginosa in each growth phase was studied. The complexing capacities (CLs) of the exudates were found to vary from 0.12 to 0.75 μmol dm-3. The values of CLincreased as culture time passed. The average value of the conditional stability constants (K′MLs) was 108.6for the complexes of the exponential growth phase and was 107.8for that after the stationary growth phase. The half-wave potential for Ag/AgCl electrode was -1.4 V for the complexes in the exponential growth phase and was -1.5 V for that in the declining phase. Most of the ligands in the exudates were found in the range of 103-104Da in the molecular weight for the exponential growth phase and were found in the lower range than 103Da for the declining phase. All of these results suggest that the copper complexing ligands found in the exudates are of different properties at the different growth stages of the Microcystis. © 1989.
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