The Influence of pH on Zinc Lability and Toxicity to a Tropical Freshwater Microalga

Price, Gwilym A.V.; Stauber, Jenny L.; Holland, Aleicia; Koppel, Darren J.; Genderen, Eric J. Van; Ryan, Adam C.; Jolley, Dianne F.

doi:10.1002/etc.5177

Cited by 9 publications

(17 citation statements)

References 44 publications

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“…MOPS has previously been shown to be non-toxic to microalgae and to not influence toxicity at 0.5 g L −1 . 7,26…”

Section: Methodsmentioning

confidence: 99%

“…EC50 values at 93 mg CaCO 3 L −1 hardness were taken from Price et al and included in the analysis of the present study. 7…”

Section: Methodsmentioning

confidence: 99%

“…31 DGT experiments were only conducted at pH 6.7, as previous studies had shown that pH within the tested range (of 6.7 to 8.3) did not significantly influence DGT-labile zinc concentrations. 7…”

Section: Methodsmentioning

confidence: 99%

“…MOPS has previously been shown to be non-toxic to microalgae and to not inuence toxicity at 0.5 g L À1 . 7,26 The 72 h growth inhibition bioassays were conducted in 250 mL conical asks coated in a silanizing solution (Coatasil, Thermosher Scientic) with 75 mL of test solution. Each ask was spiked with 75 mL of 1.5 g NO A 25 mL aliquot of test solution was taken from each ask for chemical analyses prior to algal inoculation but aer a 24 h preequilibration period at the test conditions.…”

Section: Toxicity Testingmentioning

confidence: 99%

“…6 Price et al assessed the influence of pH on the relationship between DGT-labile zinc and microalgal toxicity finding lability was not correlated to toxicity with changing pH. 7 Paller et al found hardness had a small influence on copper and zinc lability, relative to the influence of DOM. 8 These studies suggested that DGT measurements combined with bioavailability models may be useful as a tool for assessing metal toxicity over a range of water chemistries.…”

Section: Introductionmentioning

confidence: 99%

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The influence of hardness at varying pH on zinc toxicity and lability to a freshwater microalga, Chlorella sp.

Price

Stauber

Holland

et al. 2022

Environ. Sci.: Processes Impacts

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“…MOPS has previously been shown to be non-toxic to microalgae and to not influence toxicity at 0.5 g L −1 . 7,26…”

Section: Methodsmentioning

confidence: 99%

“…EC50 values at 93 mg CaCO 3 L −1 hardness were taken from Price et al and included in the analysis of the present study. 7…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Toxicity Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The influence of hardness at varying pH on zinc toxicity and lability to a freshwater microalga, Chlorella sp.

Price

Stauber

Holland

et al. 2022

Environ. Sci.: Processes Impacts

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The Effects of Nickel and Copper on Tropical Marine and Freshwater Microalgae Using Single and Multispecies Tests

McKnight

Gissi

Adams

et al. 2023

Enviro Toxic and Chemistry

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Microalgae are key components of aquatic food chains and are known to be sensitive to a range of contaminants. Much of the available data on metal toxicity to microalgae have been derived from temperate single‐species tests with temperate data used to supplement tropical toxicity data sets to derive guideline values. In the present study, we used single‐species and multispecies tests to investigate the toxicity of nickel and copper to tropical freshwater and marine microalgae, including the free‐swimming stage of Symbiodinium sp., a worldwide coral endosymbiont. Based on the 10% effect concentration (EC10) for growth rate, copper was two to four times more toxic than nickel to all species tested. The temperate strain of Ceratoneis closterium was eight to 10 times more sensitive to nickel than the two tropical strains. Freshwater Monoraphidium arcuatum was less sensitive to copper and nickel in the multispecies tests compared with the single‐species tests (EC10 values increasing from 0.45 to 1.4 µg Cu/L and from 62 to 330 µg Ni/L). The Symbiodinium sp. was sensitive to copper (EC10 of 3.1 µg Cu/L) and less sensitive to nickel (EC50 >1600 µg Ni/L). This is an important contribution of data on the chronic toxicity of nickel to Symbiodinium sp. A key result from the present study was that three microalgal species had EC10 values below the current copper water quality guideline value for 95% species protection in slightly to moderately disturbed systems in Australia and New Zealand, indicating that they may not be adequately protected by the current copper guideline value. By contrast, toxicity of nickel to microalgae is unlikely to occur at exposure concentrations typically found in fresh and marine waters. Environ Toxicol Chem 2023;42:901–913. © 2023 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.

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Applicability of Chronic Multiple Linear Regression Models for Predicting Zinc Toxicity in Australian and New Zealand Freshwaters

Stauber

Gadd

Price

et al. 2023

Enviro Toxic and Chemistry

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Bioavailability models e.g., multiple linear regressions (MLRs) of water quality parameters, are increasingly being used to develop bioavailability‐based water quality criteria for metals. However, models developed for the Northern Hemisphere cannot be adopted for Australia and New Zealand without first validating them against local species and local water chemistry characteristics. This study investigated the applicability of zinc chronic bioavailability models to predict toxicity in a range of uncontaminated natural waters in Australia and New Zealand. Water chemistry data were compiled to guide a selection of waters with different zinc toxicity modifying factors (TMFs). Predicted toxicities using several bioavailability models were compared to observed chronic toxicities for the green alga Raphidocelis subcapitata and the native cladocerans Ceriodaphnia cf. dubia and Daphnia thomsoni. The most sensitive species to zinc in five New Zealand freshwaters was R. subcapitata (72‐h growth rate), with toxicity ameliorated by high DOC or low pH, and hardness having a minimal influence. Zinc toxicity to D. thomsoni (reproduction) was ameliorated by both high DOC and hardness in these same waters. No single trophic level‐specific EC10 MLR was the best predictor of chronic toxicity to the cladocerans, and MLRs based on EC10 values both over‐ and under‐predicted zinc toxicity. EC50 MLRs better predicted toxicities to both the Australian and New Zealand cladocerans to within a factor of 2 of the observed toxicities in most waters. This suggests that existing MLRs may be useful for normalising local ecotoxicity data to derive water quality criteria for Australia and New Zealand. The final choice of models will depend on their predictive ability, level of protection and ease of use.

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The Influence of pH on Zinc Lability and Toxicity to a Tropical Freshwater Microalga

Cited by 9 publications

References 44 publications

The influence of hardness at varying pH on zinc toxicity and lability to a freshwater microalga, Chlorella sp.

The influence of hardness at varying pH on zinc toxicity and lability to a freshwater microalga, Chlorella sp.

The Effects of Nickel and Copper on Tropical Marine and Freshwater Microalgae Using Single and Multispecies Tests

Applicability of Chronic Multiple Linear Regression Models for Predicting Zinc Toxicity in Australian and New Zealand Freshwaters

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