Abstract
Polarographic and spectrophotometric investigations of Cu(II) complex formation with dextran at 20 °C and J=0.1 mol l −1 showed that the complexation of Cu(II) ions begins at pH over 7. The formation of Cu(II) hydroxycomplexes with deprotonized dextran monomer units was observed at pH 8–12. With further increase in solution pH, the Cu(II)-dextran complex decomposes and converts to Cu(OH) 4 2−. The concentration of uncomplexed Cu(II) ions was determined in the solutions containing 5 mmol l −1 Cu(II) and 10–30 g l −1 dextran. Concentration of free Cu(II) ions diminishes by 14 orders of magnitude at pH 12.75 comparing with pH 7.
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