Laminaria kelps impact iodine speciation chemistry in coastal seawater

ΜW Carrano; Carl J. Carrano; Hanan  Al-Adilah; Martin D J Sayer; Christos I. Katsaros; Andrea Raab; Jörg Feldmann; Frithjof C  Küpper

doi:10.1016/j.ecss.2021.107531

Laminaria kelps impact iodine speciation chemistry in coastal seawater

ΜW Carrano, Carl J. Carrano^* (Corresponding Author), Hanan Al-Adilah, Martin D J Sayer, Christos I. Katsaros, Andrea Raab, Jörg Feldmann, Frithjof C Küpper^* (Corresponding Author)

^*Corresponding author for this work

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Abstract

Kelp (Laminaria digitata) uses iodide as a unique inorganic antioxidant to protect its surface and apoplastic space against reactive oxygen species such as ozone, hydrogen peroxide and superoxide, with implications for atmospheric and marine chemistry as well as regional climatic processes. If kelp is covered by seawater, this results in iodide leaching into surrounding sea water. In this study, the influence of the kelps Laminaria digitata, L. hyperborea, L. ochroleuca and Saccharina latissima on iodine speciation chemistry was explored at two sites in Oban (Argyll, Scotland) and Roscoff (Brittany, France) based on diver-operated in situ sampling. Seawater samples were subsequently analysed voltammetrically, accompanied by determination of extractable iodine concentrations in the tissues of the thalli surveyed by ICP-MS. The main result is that iodide concentrations in the vicinity of kelp thalli are strongly enhanced, especially at low tide, while iodate concentrations are decreased in comparison to open coastal water and open ocean concentrations.

Original language	English
Article number	107531
Number of pages	9
Journal	Estuarine, Coastal and Shelf Science
Volume	262
Early online date	3 Nov 2021
DOIs	https://doi.org/10.1016/j.ecss.2021.107531
Publication status	Published - 5 Nov 2021

Keywords

algae
iodate
iodide
kelp
halogens
seawater

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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@article{d4f32986a63a4548b261b3c7ba473cee,

title = "Laminaria kelps impact iodine speciation chemistry in coastal seawater",

abstract = "Kelp (Laminaria digitata) uses iodide as a unique inorganic antioxidant to protect its surface and apoplastic space against reactive oxygen species such as ozone, hydrogen peroxide and superoxide, with implications for atmospheric and marine chemistry as well as regional climatic processes. If kelp is covered by seawater, this results in iodide leaching into surrounding sea water. In this study, the influence of the kelps Laminaria digitata, L. hyperborea, L. ochroleuca and Saccharina latissima on iodine speciation chemistry was explored at two sites in Oban (Argyll, Scotland) and Roscoff (Brittany, France) based on diver-operated in situ sampling. Seawater samples were subsequently analysed voltammetrically, accompanied by determination of extractable iodine concentrations in the tissues of the thalli surveyed by ICP-MS. The main result is that iodide concentrations in the vicinity of kelp thalli are strongly enhanced, especially at low tide, while iodate concentrations are decreased in comparison to open coastal water and open ocean concentrations.",

keywords = "algae, iodate, iodide, kelp, halogens, seawater",

author = "ΜW Carrano and Carrano, {Carl J.} and Hanan Al-Adilah and Sayer, {Martin D J} and Katsaros, {Christos I.} and Andrea Raab and J{\"o}rg Feldmann and K{\"u}pper, {Frithjof C}",

note = "Acknowledgements We would like to thank Joanna Smart, Andrew Mogg, Hugh Brown and Elaine Azzopardi (Tritonia Scientific) and Wilfried Thomas (Roscoff) for diving support. We are also grateful to Kathryn Dawson (Tritonia Scientific) for drawing the maps in Fig. 1 and to Joanna Smart (University of Tasmania and Tritonia Scientific) for providing the photograph in Fig. 22. The authors are grateful for support from the European Union{\textquoteright}s Horizon 2020 research and innovation programme under grant agreement No. 730984, for ASSEMBLE+ awards no. 410 (to CJC, for the visit to Tritonia Scientific Ltd. and the Scottish Association for Marine Science) and no. 370 (to FCK, for the visit to the Station Biologique de Roscoff / CNRS-Sorbonne Universit{\'e}s). Funding from the UK Natural Environment Research Council (NERC) through grants NE/D521522/1, NE/F012705/1, and Oceans 2025 (WP4.5) programs to FCK; the National Science Foundation (CHE-1664657) to CJC and FCK; the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011) and a fellowship from the Hanse-Wissenschaftkolleg (HWK) to CJC are also gratefully acknowledged.",

year = "2021",

month = nov,

day = "5",

doi = "10.1016/j.ecss.2021.107531",

language = "English",

volume = "262",

journal = "Estuarine, Coastal and Shelf Science",

issn = "0272-7714",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Laminaria kelps impact iodine speciation chemistry in coastal seawater

AU - Carrano, ΜW

AU - Carrano, Carl J.

AU - Al-Adilah, Hanan

AU - Sayer, Martin D J

AU - Katsaros, Christos I.

AU - Raab, Andrea

AU - Feldmann, Jörg

AU - Küpper, Frithjof C

N1 - Acknowledgements We would like to thank Joanna Smart, Andrew Mogg, Hugh Brown and Elaine Azzopardi (Tritonia Scientific) and Wilfried Thomas (Roscoff) for diving support. We are also grateful to Kathryn Dawson (Tritonia Scientific) for drawing the maps in Fig. 1 and to Joanna Smart (University of Tasmania and Tritonia Scientific) for providing the photograph in Fig. 22. The authors are grateful for support from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 730984, for ASSEMBLE+ awards no. 410 (to CJC, for the visit to Tritonia Scientific Ltd. and the Scottish Association for Marine Science) and no. 370 (to FCK, for the visit to the Station Biologique de Roscoff / CNRS-Sorbonne Universités). Funding from the UK Natural Environment Research Council (NERC) through grants NE/D521522/1, NE/F012705/1, and Oceans 2025 (WP4.5) programs to FCK; the National Science Foundation (CHE-1664657) to CJC and FCK; the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011) and a fellowship from the Hanse-Wissenschaftkolleg (HWK) to CJC are also gratefully acknowledged.

PY - 2021/11/5

Y1 - 2021/11/5

N2 - Kelp (Laminaria digitata) uses iodide as a unique inorganic antioxidant to protect its surface and apoplastic space against reactive oxygen species such as ozone, hydrogen peroxide and superoxide, with implications for atmospheric and marine chemistry as well as regional climatic processes. If kelp is covered by seawater, this results in iodide leaching into surrounding sea water. In this study, the influence of the kelps Laminaria digitata, L. hyperborea, L. ochroleuca and Saccharina latissima on iodine speciation chemistry was explored at two sites in Oban (Argyll, Scotland) and Roscoff (Brittany, France) based on diver-operated in situ sampling. Seawater samples were subsequently analysed voltammetrically, accompanied by determination of extractable iodine concentrations in the tissues of the thalli surveyed by ICP-MS. The main result is that iodide concentrations in the vicinity of kelp thalli are strongly enhanced, especially at low tide, while iodate concentrations are decreased in comparison to open coastal water and open ocean concentrations.

AB - Kelp (Laminaria digitata) uses iodide as a unique inorganic antioxidant to protect its surface and apoplastic space against reactive oxygen species such as ozone, hydrogen peroxide and superoxide, with implications for atmospheric and marine chemistry as well as regional climatic processes. If kelp is covered by seawater, this results in iodide leaching into surrounding sea water. In this study, the influence of the kelps Laminaria digitata, L. hyperborea, L. ochroleuca and Saccharina latissima on iodine speciation chemistry was explored at two sites in Oban (Argyll, Scotland) and Roscoff (Brittany, France) based on diver-operated in situ sampling. Seawater samples were subsequently analysed voltammetrically, accompanied by determination of extractable iodine concentrations in the tissues of the thalli surveyed by ICP-MS. The main result is that iodide concentrations in the vicinity of kelp thalli are strongly enhanced, especially at low tide, while iodate concentrations are decreased in comparison to open coastal water and open ocean concentrations.

KW - algae

KW - iodate

KW - iodide

KW - kelp

KW - halogens

KW - seawater

U2 - 10.1016/j.ecss.2021.107531

DO - 10.1016/j.ecss.2021.107531

M3 - Article

VL - 262

JO - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

SN - 0272-7714

M1 - 107531

ER -

Laminaria kelps impact iodine speciation chemistry in coastal seawater

Abstract

Keywords

UN SDGs

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