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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
3 Downloads (Pure)


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 languageEnglish
Article number107531
Number of pages9
JournalEstuarine, Coastal and Shelf Science
Early online date3 Nov 2021
Publication statusPublished - 5 Nov 2021


  • algae
  • iodate
  • iodide
  • kelp
  • halogens
  • seawater


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