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Zinc cycling in the Tasman Sea: distribution, speciation and relation to phytoplankton community

journal contribution
posted on 2023-05-18, 19:24 authored by Sinoir, M, Ellwood, MJ, Butler, ECV, Andrew BowieAndrew Bowie, Mongin, M, Hassler, CS
Zinc (Zn) is essential for phytoplankton growth as it plays a central role within many enzymatic systems within phytoplankton. Here, we present dissolved Zn concentration and Zn chemical speciation results for samples collected at four stations in the Tasman Sea east of Australia. Dissolved Zn concentrations determined using isotope dilution inductively coupled plasma-mass spectrometry (ICP-MS) ranged between 0.02 to 0.19 nmol L−1 (15 m depth) and 0.02 to 0.11 nmol L−1 (150 m depth) along a north–south transect. Zn speciation determined using Anodic Stripping Voltammetry (ASV) on four selected profiles from the Tasman Sea indicated that dissolved Zn is strongly complexed to natural organic ligands, with the conditional stability constant for the Zn–ligand complex (log K′ZnL) ranging between 9.3 and 11.4. Dissolved ligand concentrations showed variations with concentrations ranging between 0.8 and 4 nmol L−1. In surface waters, ligand concentrations always exceeded dissolved Zn concentrations, lowering free Zn2+ ion concentrations into the picomolar range. Based on comparisons between Zn speciation and the phytoplankton community of the Tasman Sea, we suggest that there is the potential for zinc limitation of certain phytoplankton groups in this region and feedback by phytoplankton on ligands, hence, on Zn biogeochemistry.

Funding

Australian Research Council

History

Publication title

Marine Chemistry

Volume

182

Pagination

25-37

ISSN

0304-4203

Department/School

Institute for Marine and Antarctic Studies

Publisher

Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

© 2016 Elsevier

Repository Status

  • Restricted

Socio-economic Objectives

Measurement and assessment of marine water quality and condition

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