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Title: Formation of copper complexes in landfill leachate and their toxicity to zebrafish embryos

Abstract

Toxic metal organic complexes have not been found in natural waters, although some organic acids form bioavailable lipophilic and metabolite-type metal complexes. Landfill leachates usually contain organic acids and in the urban environment these leachates, when mixed with storm waters containing Cu, could be a source of toxic Cu organic complexes in streams and estuaries. The authors investigated the formation of Cu complexes in the leachate from an active urban landfill and found that some of the complexes formed were toxic to zebrafish embryos. High and low nominal molecular weight (NMWT) fractions; >5,000 Da and <700 Da, of leachate both formed Cu complexes with almost identical Cu complexing characteristics but the toxicity was due solely to the low NMWT complexes formed in the <700 Da fraction. Chemical equilibrium modeling with MINTEQA2 and H and Cu complex conditional association constants and ligand concentrations obtained from pH and Cu titrations with a Cu ion-selective electrode and van den Berg-Ruzic analyses of the titration data was used to calculate the copper speciation in the embryo test solutions. This calculated speciation, which was confirmed by measurements of Cu{sup 2+} in the test solutions, enabled the toxicity due to the free Cu ion and tomore » the Cu complexes to be distinguished.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Auckland (NZ)
OSTI Identifier:
20067676
Alternate Identifier(s):
OSTI ID: 20067676
Resource Type:
Journal Article
Journal Name:
Environmental Toxicology and Chemistry
Additional Journal Information:
Journal Volume: 19; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0730-7268
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 63 RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS; WATER POLLUTION; SANITARY LANDFILLS; LEACHATES; COPPER; COMPLEXES; BIOLOGICAL INDICATORS; TOXICITY; FISHES; ENVIRONMENTAL IMPACTS

Citation Formats

Fraser, J.K., Butler, C.A., Timperley, M.H., and Evans, C.W. Formation of copper complexes in landfill leachate and their toxicity to zebrafish embryos. United States: N. p., 2000. Web. doi:10.1897/1551-5028(2000)019<1397:FOCCIL>2.3.CO;2.
Fraser, J.K., Butler, C.A., Timperley, M.H., & Evans, C.W. Formation of copper complexes in landfill leachate and their toxicity to zebrafish embryos. United States. doi:10.1897/1551-5028(2000)019<1397:FOCCIL>2.3.CO;2.
Fraser, J.K., Butler, C.A., Timperley, M.H., and Evans, C.W. Mon . "Formation of copper complexes in landfill leachate and their toxicity to zebrafish embryos". United States. doi:10.1897/1551-5028(2000)019<1397:FOCCIL>2.3.CO;2.
@article{osti_20067676,
title = {Formation of copper complexes in landfill leachate and their toxicity to zebrafish embryos},
author = {Fraser, J.K. and Butler, C.A. and Timperley, M.H. and Evans, C.W.},
abstractNote = {Toxic metal organic complexes have not been found in natural waters, although some organic acids form bioavailable lipophilic and metabolite-type metal complexes. Landfill leachates usually contain organic acids and in the urban environment these leachates, when mixed with storm waters containing Cu, could be a source of toxic Cu organic complexes in streams and estuaries. The authors investigated the formation of Cu complexes in the leachate from an active urban landfill and found that some of the complexes formed were toxic to zebrafish embryos. High and low nominal molecular weight (NMWT) fractions; >5,000 Da and <700 Da, of leachate both formed Cu complexes with almost identical Cu complexing characteristics but the toxicity was due solely to the low NMWT complexes formed in the <700 Da fraction. Chemical equilibrium modeling with MINTEQA2 and H and Cu complex conditional association constants and ligand concentrations obtained from pH and Cu titrations with a Cu ion-selective electrode and van den Berg-Ruzic analyses of the titration data was used to calculate the copper speciation in the embryo test solutions. This calculated speciation, which was confirmed by measurements of Cu{sup 2+} in the test solutions, enabled the toxicity due to the free Cu ion and to the Cu complexes to be distinguished.},
doi = {10.1897/1551-5028(2000)019<1397:FOCCIL>2.3.CO;2},
journal = {Environmental Toxicology and Chemistry},
issn = {0730-7268},
number = 5,
volume = 19,
place = {United States},
year = {2000},
month = {5}
}