The dissolved organic iodine species of the isotopic ratio of super(129)I/super (127)I: A novel tool for tracing terrestrial organic matter in the estuarine surface waters of Galveston Bay, Texas

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dc.acquisition-srcen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorSchwehr, Kathleen Aen_US
dc.contributor.authorSantschi, Peter Hen_US
dc.contributor.authorElmore, Daviden_US
dc.contributor.otherLimnology and Oceanography: Methodsen_US
dc.date.accessioned2010-02-15T16:46:04Z
dc.date.available2010-02-15T16:46:04Z
dc.date.issued2005en_US
dc.degreeen_US
dc.descriptionpgs. 326-337en_US
dc.description-otheren_US
dc.description.abstractVariations in super(129)I/ super(127)I ratios were used to trace terrestrial organic carbon (tDOC) across an estuary because (1) iodine is biophilic, up to 75% of total iodine in fresh and coastal marine waters partitions into organic iodine; (2) super(129)I/ super(127)I ratios in tDOC are greatly elevated over those from marine systems because atmospheric emissions of super(129)I from European nuclear fuel reprocessing facilities were mixed more quickly in the surface ocean, up to 500 m in a decade, than the terrestrial system, which mixed approximately 10 cm in 10 to 50 y; and (3) the oceanic contribution of super(127)I (50 to 65 ppb) to the ratio has a greater dilution effect than super(127)I from freshwater (0.5 to 40 ppb). Analytical techniques were developed for super(129)I/ super(127)I ratio determination in dissolved organic iodine (DOI) and the other iodine species, using dehydrohalogenation, anion chromatography, high- performance liquid chromatography, and accelerator mass spectrometry, to be applied to samples from Galveston Bay, Texas. Results indicate that super(129)I/ super(127)I ratios in DOI from terrestrial sources are elevated in the upper estuary up to salinity of about 20, similar to a behavior previously described for this estuary for stable isotopic signals for dissolved organic matter. super(129)I/ super(127)I ratios in the other iodine species, e.g., iodide and iodate, did not show this feature, indicating fast isotopic and chemical equilibration between the two isotopes among the different inorganic species in the estuary. These results thus provide proof of concept that super(129)I/ super(127)I- DOI can serve as a tracer for tDOC in the coastal zone.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalveston Bayen_US
dc.history1-15-09 kswen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/18518
dc.latitudeen_US
dc.locationNot available in house - Please contact GBIC for assistanceen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries10042.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectanionsen_US
dc.subjectcoastal zoneen_US
dc.subjectdissolved solidsen_US
dc.subjectdissolved organic matteren_US
dc.subjectestuariesen_US
dc.subjectiodidesen_US
dc.subjectiodineen_US
dc.subjectisotopesen_US
dc.subjectliquid chromatographyen_US
dc.subjectmass spectrometryen_US
dc.subjectmethodologyen_US
dc.subjectsalinityen_US
dc.subjectsurface wateren_US
dc.subjecttracersen_US
dc.titleThe dissolved organic iodine species of the isotopic ratio of super(129)I/super (127)I: A novel tool for tracing terrestrial organic matter in the estuarine surface waters of Galveston Bay, Texasen_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue3en_US

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