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Effect of Dissolved Organic Matter Concentration and Source on the Chronic Toxicity of Copper and Nickel Mixtures to Chlorella sp.
Environ Toxicol Chem. 2021 07; 40(7):1908-1918.ET

Abstract

There have been limited studies on the effects of toxicity-modifying factors, such as dissolved organic matter (DOM), on the toxicity of metal mixtures to aquatic biota. The present study investigated the effects of DOM concentration (low, 2.8 ± 0.1 mg C/L; high, 11 ± 1.0 mg C/L) and DOM source (predominantly terrestrial or microbial) on the chronic toxicity of copper (Cu) and nickel (Ni) binary mixtures to the green freshwater microalga Chlorella sp. This was assessed by using a full factorial design of 72-h growth inhibition bioassays. Measured algal growth rate was compared with growth predicted by the concentration addition and independent action reference models. Model predictions were based on concentrations of dissolved metals, labile metals (measured by diffusive gradients in thin films [DGT]), and calculated free metal ions (determined by the Windermere Humic Aqueous Model). Copper/Ni mixture toxicity was synergistic to Chlorella sp. in the absence of added DOM, with evidence of metal concentration-dependent toxicity at low effect concentrations. As DOM concentration increased, the mixture interaction changed from synergism to noninteraction or antagonism depending on the metal speciation method used. The DOM source had no significant effect on mixture interaction when based on dissolved and free metal ion concentrations but was significantly different when based on DGT-labile metal concentrations. Ratio-dependent mixture interaction was observed in all treatments, with increased deviation from the reference model predictions as the mixture changed from Ni- to Cu-dominated. The present study demonstrated that both DOM concentration and source can significantly change metal mixture toxicity interactions and that these interactions can be interpreted differently depending on the metal speciation method used. Environ Toxicol Chem 2021;40:1908-1918. © 2021 SETAC.

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Authors+Show Affiliations

Macoustra GK
School of Earth, Atmosphere and Life Sciences, Faculty of Science, Medicine and Health, University of Wollongong, New South Wales, Australia.
Koppel DJ
CSIRO Land and Water, Lucas Heights, New South Wales, Australia. Faculty of Science, University of Technology Sydney, Sydney, New South Wales, Australia.
Jolley DF
School of Earth, Atmosphere and Life Sciences, Faculty of Science, Medicine and Health, University of Wollongong, New South Wales, Australia. CSIRO Land and Water, Lucas Heights, New South Wales, Australia.
Stauber JL
CSIRO Land and Water, Lucas Heights, New South Wales, Australia.
Holland A
CSIRO Land and Water, Lucas Heights, New South Wales, Australia. School of Life Science, Department of Ecology, Environment and Evolution, Centre for Freshwater Ecosystems, La Trobe University, Albury/Wodonga Campus, Victoria, Australia.

MeSH

ChlorellaCopperDissolved Organic MatterNickelWater Pollutants, Chemical

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

33751626

Citation

Macoustra, Gabriella K., et al. "Effect of Dissolved Organic Matter Concentration and Source On the Chronic Toxicity of Copper and Nickel Mixtures to Chlorella Sp." Environmental Toxicology and Chemistry, vol. 40, no. 7, 2021, pp. 1908-1918.
Macoustra GK, Koppel DJ, Jolley DF, et al. Effect of Dissolved Organic Matter Concentration and Source on the Chronic Toxicity of Copper and Nickel Mixtures to Chlorella sp. Environ Toxicol Chem. 2021;40(7):1908-1918.
Macoustra, G. K., Koppel, D. J., Jolley, D. F., Stauber, J. L., & Holland, A. (2021). Effect of Dissolved Organic Matter Concentration and Source on the Chronic Toxicity of Copper and Nickel Mixtures to Chlorella sp. Environmental Toxicology and Chemistry, 40(7), 1908-1918. https://doi.org/10.1002/etc.5038
Macoustra GK, et al. Effect of Dissolved Organic Matter Concentration and Source On the Chronic Toxicity of Copper and Nickel Mixtures to Chlorella Sp. Environ Toxicol Chem. 2021;40(7):1908-1918. PubMed PMID: 33751626.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of Dissolved Organic Matter Concentration and Source on the Chronic Toxicity of Copper and Nickel Mixtures to Chlorella sp. AU - Macoustra,Gabriella K, AU - Koppel,Darren J, AU - Jolley,Dianne F, AU - Stauber,Jenny L, AU - Holland,Aleicia, Y1 - 2021/05/08/ PY - 2020/12/29/revised PY - 2020/11/05/received PY - 2021/03/09/accepted PY - 2021/3/23/pubmed PY - 2022/4/1/medline PY - 2021/3/22/entrez KW - Algae KW - Diffusive gradients in thin films KW - Metal bioavailability KW - Metal speciation KW - Mixture toxicology KW - Passive sampler KW - Windermere Humic Aqueous Model SP - 1908 EP - 1918 JF - Environmental toxicology and chemistry JO - Environ Toxicol Chem VL - 40 IS - 7 N2 - There have been limited studies on the effects of toxicity-modifying factors, such as dissolved organic matter (DOM), on the toxicity of metal mixtures to aquatic biota. The present study investigated the effects of DOM concentration (low, 2.8 ± 0.1 mg C/L; high, 11 ± 1.0 mg C/L) and DOM source (predominantly terrestrial or microbial) on the chronic toxicity of copper (Cu) and nickel (Ni) binary mixtures to the green freshwater microalga Chlorella sp. This was assessed by using a full factorial design of 72-h growth inhibition bioassays. Measured algal growth rate was compared with growth predicted by the concentration addition and independent action reference models. Model predictions were based on concentrations of dissolved metals, labile metals (measured by diffusive gradients in thin films [DGT]), and calculated free metal ions (determined by the Windermere Humic Aqueous Model). Copper/Ni mixture toxicity was synergistic to Chlorella sp. in the absence of added DOM, with evidence of metal concentration-dependent toxicity at low effect concentrations. As DOM concentration increased, the mixture interaction changed from synergism to noninteraction or antagonism depending on the metal speciation method used. The DOM source had no significant effect on mixture interaction when based on dissolved and free metal ion concentrations but was significantly different when based on DGT-labile metal concentrations. Ratio-dependent mixture interaction was observed in all treatments, with increased deviation from the reference model predictions as the mixture changed from Ni- to Cu-dominated. The present study demonstrated that both DOM concentration and source can significantly change metal mixture toxicity interactions and that these interactions can be interpreted differently depending on the metal speciation method used. Environ Toxicol Chem 2021;40:1908-1918. © 2021 SETAC. SN - 1552-8618 UR - https://www.unboundmedicine.com/medline/citation/33751626/Effect_of_Dissolved_Organic_Matter_Concentration_and_Source_on_the_Chronic_Toxicity_of_Copper_and_Nickel_Mixtures_to_Chlorella_sp_ DB - PRIME DP - Unbound Medicine ER -