Radiocarbon analysis of bulk and fractionated dissolved organic carbon from ground and surface waters in remote NW Queensland

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dc.contributor.authorVan der Ley, Men_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorGraham, ITen_AU
dc.date.accessioned2022-11-07T06:06:37Zen_AU
dc.date.available2022-11-07T06:06:37Zen_AU
dc.date.issued2012-08-05en_AU
dc.date.statistics2022-01-31en_AU
dc.description.abstractRadiocarbon analysis of dissolved inorganic carbon (DIC) is prone to dilution by radiocarbon-free DIC from older hosts, particularly in carbonate-rich areas. Dissolved organic carbon (DOC) can provide a source of carbon less affected by water-rock interactions, but is rarely utilised due to more complex sample processing and potential residence time differences for specific fractions. We have developed and applied 14C methods of bulk and fractionated DOC to waters in the Lawn Hill region, remote NW Queensland. As groundwater chemistry here is largely controlled by interactions with Cambrian carbonates, analysis of 14CDIC required uncertain geochemical corrections. Additional samples were analysed from the Greater Sydney region, NSW, with greater variety of residence times and chemistries, to test the methodology. Bulk DOC was pre-concentrated in the field using a weak and non-selective resin, followed by extraction in the lab and fractionation into different DOC groups based on ultrafiltration and selective resin adsorption techniques. All samples were characterised using liquid chromatography and fluorescence to monitor the characteristics of different fractions. Comparisons of 14C activities of DIC and DOC highlight the effect of carbonate dissolution and the usefulness of DOC in radiocarbon analyses. DIC activities were consistently lower than those of DOC, particularly in carbonate-rich regions. Additionally, comparison of fractionated DOC samples showed varying 14C activities, indicating that fractionation may be required for reliable residence times.en_AU
dc.identifier.citationvan der Ley, M., Cendón, D., & Graham, I. (2012). Radiocarbon analysis of bulk and fractionated dissolved organic carbon from ground and surface waters in remote NW Queensland. Paper presented to the 34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow", Brisbane, Australia, 5-10 August 2012. (pp. 922).en_AU
dc.identifier.conferenceenddate10 August 2012en_AU
dc.identifier.conferencename34th International Geological Congress 2012, 'Unearthing our Past and Future - Resourcing Tomorrow'en_AU
dc.identifier.conferenceplaceBrisbane, Australiaen_AU
dc.identifier.conferencestartdate5 August 2012en_AU
dc.identifier.otherGC125716en_AU
dc.identifier.pagination922en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14001en_AU
dc.language.isoenen_AU
dc.publisherAustralian Geosciences Councilen_AU
dc.subjectCarbon 14en_AU
dc.subjectGround wateren_AU
dc.subjectSurface watersen_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectChromatographyen_AU
dc.subjectFluorescenceen_AU
dc.subjectCarbonen_AU
dc.titleRadiocarbon analysis of bulk and fractionated dissolved organic carbon from ground and surface waters in remote NW Queenslanden_AU
dc.typeConference Abstracten_AU
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