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Copper complexation in eutrophic and humic Lake Tjeukemeer, The Netherlands
Author(s) -
VERWEIJ W.,
HAAN H. DE,
BOER T. DE,
VOERMAN J.
Publication year - 1989
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1989.tb01375.x
Subject(s) - copper , ultrafiltration (renal) , titration , eutrophication , algae , chemistry , environmental chemistry , genetic algorithm , humus , inorganic chemistry , ecology , chromatography , biology , soil water , nutrient , organic chemistry
SUMMARY. 1. Copper(II) complexation in the eutrophic. humus‐rich Lake Tjeukemeer was measured fortnightly for several years by copper titration (Ion Selective Electrode) and by copper solubilization. Additionally, the copper speciation during titration was followed by ultrafiltration. 2. The Tjeukemeer showed high ligand concentrations able to complex up to 8.5X10 ‐5 M Cu. 3. Scatchard plots and affinity spectra of the titration data allowed the discrimination of at least three different binding sites. In Scatchard plots log K values ranged from 5 to 9, in affinity spectra from 4.5 to 8. 4. The highest log K values coincided with relatively low humus concentrations and blooms of algae, mainly Cyanobacteria. 5. The ultrafiltration experiments indicated that relatively small size fractions (<10 nm) have the highest copper binding affinity.