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Halogenated organic compounds: A massive halogen reservoir and an intriguing component of the marine dissolved organic matter pool.
Geophys. Res. Lett. 53:119062 (2026)
Biogeochemical reactions produce volatile halocarbons and semi- to nonvolatile dissolved organic halogens (DOX) in marine systems. The former has a large influence on atmospheric chemistry, but little is known about DOX. Here, we present depth profiles of dissolved organic bromine (DOBr) and -iodine (DOI) isolated from the Central North Atlantic and the Central North Pacific. DOX ranged from ∼5 to 11 nM in the surface and decreased to ∼1 to 7 nM below 1,500 m. Relative to DOI, DOBr is elevated and more stable at depth. Moreover, 92 individual DOBr molecular ions were identified by high-resolution mass spectrometry for the first time in seawater using a solid phase extraction/sequential elution technique. Similar DOBr ions with an oxygen-to-carbon ratio of 0.35 and a hydrogen-to-carbon ratio of 1.3 were present throughout the water column. Thus, deep ocean DOBr may be a hitherto overlooked component of marine refractory organic matter.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Bats ; Dissolved Organic Halogens ; Dissolved Organic Matter ; Hot; Molecular Formula Assignment; Time-series Station; Iodine Speciation; Chesapeake Bay; Ocean; Bromine; Waters; Sea; Spectrometry; Chemistry
ISSN (print) / ISBN
0094-8276
e-ISSN
1944-8007
Journal
Geophysical Research Letters
Quellenangaben
Volume: 53,
Issue: 1,
Article Number: 119062
Publisher
Wiley
Publishing Place
Hoboken, NJ
Reviewing status
Peer reviewed
Institute(s)
Research Unit BioGeoChemistry and Analytics (BGC)
Grants
National Science Foundation