The effect of microbial activity and adsorption processes on groundwater dissolved organic carbon character and concentration

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dc.contributor.authorMcDonough, LKen_AU
dc.contributor.authorOudone, PPen_AU
dc.contributor.authorRutlidge, Hen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorO'Carroll, DMen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2023-01-19T04:16:19Zen_AU
dc.date.available2023-01-19T04:16:19Zen_AU
dc.date.issued2017-12-14en_AU
dc.date.statistics2022-11-28en_AU
dc.description.abstractBalancing the terrestrial global carbon budget has proven to be a significant challenge. Whilst the movement of carbon in the atmosphere, rivers and oceans has been extensively studied, the potential for groundwater to act as a carbon source or sink through both microbial activity and sorption to and from mineral surfaces, is poorly understood. To investigate the biodegradable component of groundwater dissolved organic carbon (DOC), groundwater samples were collected from multiple coastal and inland sites. Water quality parameters such as pH, electrical conductivity, temperature, dissolved oxygen were measured in the field. Samples were analysed and characterised for their biodegradable DOC content using spectrofluorometric and Liquid Chromatography-Organic Carbon Detection (LC-OCD) techniques at set intervals within a 28 day period. Further to this, we performed laboratory sorption experiments on our groundwater samples using different minerals to examine the effect of adsorption processes on DOC character and concentration. Calcium carbonate, quartz and iron coated quartz were heated to 400ºC to remove potential carbon contamination, and then added at various known masses (0 mg to 10 g) to 50 mL of groundwater. Samples were then rotated for two hours, filtered at 0.2 μm and analysed by LC-OCD. This research forms part of an ongoing project which will assist in identifying the factors affecting the mobilisation, transport and removal of DOC in uncontaminated groundwater. By quantifying the relative importance of these processes, we can then determine whether the groundwater is a carbon source or sink. Importantly, this information will help guide policy and identify the need to include groundwater resources as part of the carbon economy.en_AU
dc.identifier.articlenumberB43F-1621en_AU
dc.identifier.booktitleAGU Fall Meeting Abstractsen_AU
dc.identifier.citationMcDonough, L., Oudone, P., Rutlidge, H., Meredith, K., O'Carroll, D. M., Andersen, M. S., & Baker, A. (2017). The effect of microbial activity and adsorption processes on groundwater dissolved organic carbon character and concentration. Poster presented at the AGU Fall Meeting, 2017, New Orleans, Louisiana, USA, 11-15 December 2017. In AGU Fall Meeting Abstracts, Vol. 2017, B43F-1621. Retrieved from: https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/219381en_AU
dc.identifier.conferenceenddate15 December 2017en_AU
dc.identifier.conferencenameAGU Fall Meeting, 2017en_AU
dc.identifier.conferenceplaceNew Orleans, Louisiana, USAen_AU
dc.identifier.conferencestartdate11 December 2017en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/219381en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14404en_AU
dc.identifier.volume2017en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectGround wateren_AU
dc.subjectAdsorptionen_AU
dc.subjectCarbonen_AU
dc.subjectMicroorganismsen_AU
dc.subjectCarbon sinksen_AU
dc.subjectMineralsen_AU
dc.titleThe effect of microbial activity and adsorption processes on groundwater dissolved organic carbon character and concentrationen_AU
dc.typeConference Posteren_AU
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