UNIGE document Scientific Article
previous document  unige:83761  next document
add to browser collection
Title

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

Authors
Sinoir, Marie
Ellwood, Michael J.
Butler, Edward C.V.
Bowie, Andrew R.
Mongin, Mathieu
Published in Marine Chemistry. 2016, vol. 182, p. 25-37
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 fromthe 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.
Keywords VoltammetryZincLigandsBioavailability
Identifiers
Full text
Structures
Research group Marine and Lake Biogeochemistry
Project FNS: PP00P2_138955
Citation
(ISO format)
SINOIR, Marie et al. Zinc cycling in the Tasman Sea: Distribution, speciation and relation to phytoplankton community. In: Marine Chemistry, 2016, vol. 182, p. 25-37. https://archive-ouverte.unige.ch/unige:83761

184 hits

1 download

Update

Deposited on : 2016-05-23

Export document
Format :
Citation style :