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

Increased focus on the development and application of bioavailability‐based metal water quality guideline values requires increased understanding of the influence of water chemistry on metal bioavailability and toxicity. Development of empirical models, such as multiple linear regression models, req...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 2021-10, Vol.40 (10), p.2836-2845
Main Authors: Price, Gwilym A. V., Stauber, Jenny L., Holland, Aleicia, Koppel, Darren J., Van Genderen, Eric J., Ryan, Adam C., Jolley, Dianne F.
Format: Article
Language:English
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Summary:Increased focus on the development and application of bioavailability‐based metal water quality guideline values requires increased understanding of the influence of water chemistry on metal bioavailability and toxicity. Development of empirical models, such as multiple linear regression models, requires the assessment of the influence of individual water quality parameters as toxicity‐modifying factors. The present study investigated the effect of pH on the lability and toxicity of zinc (Zn) to a tropical green microalga (Chlorella sp.). Zinc speciation and lability were explored using the Windermere Humic Aqueous Model (WHAM7), ultrafiltration, and diffusive gradients in thin films (DGT). Zinc toxicity increased significantly with increasing pH from 6.7 to 8.3, with 50% growth inhibition effect concentrations decreasing from 185 to 53 µg l–1 across the pH range. Linear relationships between DGT‐labile Zn and dissolved Zn did not vary across the tested pH range, nor did the linear relationship between dissolved (
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.5177