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RESEARCH ARTICLE (Open Access)

Metal contaminants of emerging concern in aquatic systems

Graeme E. Batley https://orcid.org/0000-0002-3798-3368 A * and Peter G. C. Campbell https://orcid.org/0000-0001-7160-4571 B
+ Author Affiliations
- Author Affiliations

A CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia.

B Institut National de la Recherche Scientifique, Centre Eau Terre Environnement, Quebec City, QC G1K 9A9, Canada.

* Correspondence to: graeme.batley@csiro.au

Handling Editor: Kevin J Wilkinson

Environmental Chemistry 19(1) 23-40 https://doi.org/10.1071/EN22030
Submitted: 11 April 2022  Accepted: 6 May 2022   Published: 20 June 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Environmental context. There is potential for a range of metals being used in emerging industries to pose a risk if they reach aquatic environments. This is assessed by evaluating known environmental concentrations against available toxicity data. In most instances risks are low with current usage. Areas are identified where additional data are needed.

Abstract. The environmental concentrations and aquatic toxicity of a range of technology-critical metals comprising platinum group and rare earth group elements, together with gallium, germanium, indium, lithium, niobium, rhenium, tantalum, tellurium and thallium, have been reviewed to determine whether they pose a risk to aquatic ecosystem health. There is a reasonable body of toxicity data for most, but the quality is quite variable, and more data are required. Chronic toxicity EC10 or NOEC values are generally in the low mg L–1 range, far higher than the current environmental concentrations in the ng L–1 range, meaning that the existing risks to ecosystem health are extremely low. Missing are reliable toxicity data for niobium and tantalum, while confounding results for lanthanum toxicity need to be resolved. There is a likelihood that the currently low concentrations of most of these elements will increase in future years. Whether these concentrations are in bioavailable forms remains to be reliably determined. For most of the elements, measured speciation information is scarce, and unfortunately the thermodynamic data required to calculate their speciation are incomplete. In addition to this problem of uncertain speciation for some of these metals, notably those present in oxidation states of III or higher, there is also a need to explore the links between speciation and bioavailability for these higher valence metals. For circumneutral solutions, the calculated concentrations of the free metal ion tend to be very low for these metals and under such conditions the link between metal speciation and bioavailability is unclear.

Keywords: contaminant, gallium, germanium, indium, lithium, niobium, platinum group elements, rare earth elements, rhenium, tantalum, tellurium, thallium.


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