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Speciation of copper in sewage effluents and its toxicity to Daphnia magna
Author(s) -
Van Veen Eleanor,
Burton Nicola,
Comber Sean,
Gardner Michael
Publication year - 2002
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620210208
Subject(s) - effluent , daphnia magna , environmental chemistry , biotic ligand model , sewage , cladocera , dissolved organic carbon , genetic algorithm , sewage treatment , daphnia , copper , ceriodaphnia dubia , chemistry , water quality , wastewater , toxicity , environmental science , ecology , environmental engineering , biology , zooplankton , organic chemistry
Copper complexation capacity was determined in a range of sewage treatment works final effluents and receiving waters, upstream and downstream of the discharge point. Forty‐eight‐hour immobilization tests on Daphnia magna were used to assess the toxicity of copper in the effluent matrix. Complexation capacities in effluents were typically in the range 50 to 100 μg Cu/L, with higher values being found in the poorer‐quality effluents with higher dissolved organic carbon (DOC) concentrations. The tolerance of Daphnia to dissolved copper concentrations was more than quadrupled in a 50% effluent matrix, with the increase in tolerance being related to complexation capacity. Ligand concentrations in effluents were found to correlate strongly with effluent DOC. No such relationship was observed in surface waters. On mixing with river water, sewage‐derived ligands behaved conservatively and were relatively stable over time scales of up to 10 d.