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Speciation of nickel and its toxicity to Chlorella sp. in the presence of three distinct dissolved organic matter (DOM)

Journal Article


Abstract


  • Nickel is often a metal of interest in regulatory settings given its increasing prevalence in disturbed freshwaters and as a known toxicant to fish and algae. Dissolved organic matter (DOM) is a toxicity modifying factor for nickel and a ubiquitous water physicochemical parameter. This study investigated the effect of DOM concentration and source on the chronic toxicity of nickel to Chlorella sp. using three DOM at two concentrations (3.1 �� 1.8 and 12 �� 1.3 mg C/L). Nickel toxicity to Chlorella sp. was not strongly influenced by DOM concentration. In the absence of DOM, the 72-h EC50 for Chlorella sp. was 120 ��g Ni/L. In the low DOM treatment, nickel toxicity was either unchanged or slightly increased (87���140 ��g Ni/L) and unchanged or slightly decreased in the high DOM treatment (130���240 ��g Ni/L). DOM source also had little effect on nickel toxicity, the largest differences in nickel toxicity occurring in the high DOM treatment. Labile nickel (measured by diffusive gradients in thin-films, DGT) followed strong linear relationships with dissolved nickel (R2 > 0.97). DOM concentration and source had limited effect on DGT-labile nickel. DGT-labile nickel decreased with increasing DOM concentration for only one of the three DOM. Modelled labile nickel concentrations (expressed as maximum dynamic concentrations, cdynmax) largely agreed with DGT-labile nickel and suggested that toxicity is explained by free Ni2+ concentrations. This study confirms that nickel toxicity is largely unaffected by DOM concentration or source and that both measured (DGT) and modelled (cdynmax and free Ni2+) nickel concentrations can explain nickel toxicity.

UOW Authors


  •   Holland, Aleicia (external author)
  •   Jolley, Dianne (external author)
  •   Koppel, Darren (external author)

Publication Date


  • 2021

Citation


  • Macoustra, G. K., Jolley, D. F., Stauber, J. L., Koppel, D. J., & Holland, A. (2021). Speciation of nickel and its toxicity to Chlorella sp. in the presence of three distinct dissolved organic matter (DOM). Chemosphere, 273. doi:10.1016/j.chemosphere.2020.128454

Scopus Eid


  • 2-s2.0-85092621521

Volume


  • 273

Issue


Place Of Publication


Abstract


  • Nickel is often a metal of interest in regulatory settings given its increasing prevalence in disturbed freshwaters and as a known toxicant to fish and algae. Dissolved organic matter (DOM) is a toxicity modifying factor for nickel and a ubiquitous water physicochemical parameter. This study investigated the effect of DOM concentration and source on the chronic toxicity of nickel to Chlorella sp. using three DOM at two concentrations (3.1 �� 1.8 and 12 �� 1.3 mg C/L). Nickel toxicity to Chlorella sp. was not strongly influenced by DOM concentration. In the absence of DOM, the 72-h EC50 for Chlorella sp. was 120 ��g Ni/L. In the low DOM treatment, nickel toxicity was either unchanged or slightly increased (87���140 ��g Ni/L) and unchanged or slightly decreased in the high DOM treatment (130���240 ��g Ni/L). DOM source also had little effect on nickel toxicity, the largest differences in nickel toxicity occurring in the high DOM treatment. Labile nickel (measured by diffusive gradients in thin-films, DGT) followed strong linear relationships with dissolved nickel (R2 > 0.97). DOM concentration and source had limited effect on DGT-labile nickel. DGT-labile nickel decreased with increasing DOM concentration for only one of the three DOM. Modelled labile nickel concentrations (expressed as maximum dynamic concentrations, cdynmax) largely agreed with DGT-labile nickel and suggested that toxicity is explained by free Ni2+ concentrations. This study confirms that nickel toxicity is largely unaffected by DOM concentration or source and that both measured (DGT) and modelled (cdynmax and free Ni2+) nickel concentrations can explain nickel toxicity.

UOW Authors


  •   Holland, Aleicia (external author)
  •   Jolley, Dianne (external author)
  •   Koppel, Darren (external author)

Publication Date


  • 2021

Citation


  • Macoustra, G. K., Jolley, D. F., Stauber, J. L., Koppel, D. J., & Holland, A. (2021). Speciation of nickel and its toxicity to Chlorella sp. in the presence of three distinct dissolved organic matter (DOM). Chemosphere, 273. doi:10.1016/j.chemosphere.2020.128454

Scopus Eid


  • 2-s2.0-85092621521

Volume


  • 273

Issue


Place Of Publication