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Natural organic matter controls metal speciation and toxicity for marine organisms: a review

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Abstract

Heavy metals are occurring in the aquatic environment as the result of natural or anthropogenic inputs, and depending on concentration, availability and resilience time, they can differently affect the animal wellness. Numerous studies reveal that more than 99% of metals in seawater are complexed with organic ligands suggesting the major role of organic complexation on metal behavior. Moreover, the amphilic character of marine natural organic matter makes this substance a relevant medium for interactions with charged and uncharged metal molecules. Here we review mechanisms and factors that control marine organic matter composition and its interactions with metals. Organic matter–metal complexes modify metal bioavailability and, in turn, change effects on living organisms.

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Abbreviations

ASV :

Anodic stripping voltammetry

BLM :

Biotic ligand model

CLE-CSV :

Competitive ligand exchange–cathodic stripping voltammetry

DOC :

Dissolved organic carbon

DOM :

Dissolved organic matter

FIAM :

Free Ion Activity Model

HSAB :

Hard and soft acids and bases

MLR :

Multi-linear regression

NOM :

Natural organic matter

POM :

Particulate organic matter

SSC :

Site-specific criteria

WHAM :

Windermere humic aqueous model

WER :

Water effect ratio

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Acknowledgements

We are very grateful to Maria Cocurullo, PhD student of the SZN-Open University (UK), for graphic creation of the Figure 2. Special thanks to Prof. Francesco Regoli for critical reading of the manuscript. Contract grant sponsor: CLV was supported by a PhD fellowship co-founded by Stazione Zoologica Anton Dohrn and Marche Polytechnic University.

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No funding was received for conducting this study.

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All authors whose names appear on the submission made substantial contributions to the conception of the work, performed the literature search and data analysis, and drafted the manuscript. Ludovico Pontoni, Massimiliano Fabbricino and Annamaria Locascio critically revised and edited the work.

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Correspondence to Annamaria Locascio.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Pontoni, L., La Vecchia, C., Boguta, P. et al. Natural organic matter controls metal speciation and toxicity for marine organisms: a review. Environ Chem Lett 20, 797–812 (2022). https://doi.org/10.1007/s10311-021-01310-y

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  • DOI: https://doi.org/10.1007/s10311-021-01310-y

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