Abstract
Abstract A commercial product of humic acids was used to study the complexation of Cu2+ by humic substances. The precipitation of the same substances by the major inorganic salts of sea water was examined. The conditional formation constant of these complexes (K) was determined by complexometric titrations followed by a differential pulse anodic stripping voltametry procedure: the measurements of the anodic current during the titration gave a value of log K = 7. Among sea water ions, Ca2+ was the most efficient agent of precipitation (70 % of removal). Calcium ions did not displace the Cu2+ions from the humic‐copper complex during the precipitation. Consequently a significant accumulation of copper via humic substances mediation should be expected in the marine sediments.
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