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

Marie Sinoir; Michael J. Ellwood; Edward C.V. Butler; Andrew R. Bowie; Mathieu Mongin; Christel S. Hassler

doi:10.1016/j.marchem.2016.03.006

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

Marie Sinoir^*, Michael J. Ellwood, Edward C.V. Butler, Andrew R. Bowie, Mathieu Mongin, Christel S. Hassler

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	25-37
Number of pages	13
Journal	Marine Chemistry
Volume	182
DOIs	https://doi.org/10.1016/j.marchem.2016.03.006
Publication status	Published - 20 May 2016

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title = "Zinc cycling in the Tasman Sea: Distribution, speciation and relation to phytoplankton community",

abstract = "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.",

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author = "Marie Sinoir and Ellwood, {Michael J.} and Butler, {Edward C.V.} and Bowie, {Andrew R.} and Mathieu Mongin and Hassler, {Christel S.}",

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T2 - Distribution, speciation and relation to phytoplankton community

AU - Sinoir, Marie

AU - Ellwood, Michael J.

AU - Butler, Edward C.V.

AU - Bowie, Andrew R.

AU - Mongin, Mathieu

AU - Hassler, Christel S.

PY - 2016/5/20

Y1 - 2016/5/20

N2 - 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.

AB - 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.

KW - Bioavailability

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KW - Voltammetry

KW - Zinc

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DO - 10.1016/j.marchem.2016.03.006

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JO - Marine Chemistry

JF - Marine Chemistry

ER -

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

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