Extent and characterisation of natural groundwater organic matter sorption onto minerals

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dc.contributor.authorOudone, PPen_AU
dc.contributor.authorMustonen, Oen_AU
dc.contributor.authorMarjo, CEen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorMcDonough, LKen_AU
dc.contributor.authorRutlidge, Hen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorO'Carroll, DMen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2023-06-23T05:11:34Zen_AU
dc.date.available2023-06-23T05:11:34Zen_AU
dc.date.issued2019-04-08en_AU
dc.date.statistics2023-03-24en_AU
dc.descriptionDennis O'Carroll's name is shown incorrectly in the citation as D. O'carroll.en_AU
dc.description.abstractRivers and aquifers have been proven to be physiochemically connected. Despite their interaction, organic matter (OM) concentration in groundwater is much lower than rivers. One might ask where it goes. For example, is sorption responsible for this missing fraction? If so, what components of OM are utilised by groundwater sorption to the minerals? This research aims to quantify the sorption of natural groundwater DOC over a range of groundwater and surface water environments in South East Australia. Batch experiments were set up by adding 40 ml of filtered (0.22 m) sample to a range of masses of three types of sterilised minerals: iron coated sand, quartz sand and calcium carbonate. The systems were rotated for 1 hour under controlled conditions before analysis by Liquid Chromatography-Organic Carbon Detection (LC-OCD) for the aqueous phase and X-ray Photoelectron Spectroscopy (XPS) for the solid phase. Size-exclusion chromatography using LC-OCD is used to determine the remaining chemical fractions in solution. LC-OCD separates DOC into biopolymers (»20,000 g/mol), humic substances ( 1000 g/mol), building blocks (300-500 g/mol), low molecular weight neutrals (<350 g/mol) and low molecular weight acids (350 g/mol). The technique also provides measures of humic substances aromaticity and relative molecular weight. XPS is used to characterise the surface chemistry of the adsorbed organic layer in terms of the relative carbon, nitrogen, and oxygen content, and the types of chemical bonding. The results of solid-phase XPS is compared with the remaining chemical fractions in solution characterised by LC-OCD. LC-OCD results showed that humic substances were highest in concentration in the groundwater DOC compared to other fractions (13-65%) and was the significant sorbing fraction for all mineral types and water samples. The sorption extent ranges between 4-61%. This sorption was highest for iron coated sand (8-61%) followed by calcium carbonate (10-35%) and then quartz sand (4-22%). XPS showed that more sorbed organics (O, C and N) were found on iron coated sand and calcium carbonate compared to quartz sand. The extent of humic substance sorption was found proportional to its aromaticity and molecular weight for all mineral types and water samples. In conclusion, even though sediment types influence groundwater DOC sorption, the result suggests that groundwater DOM sorption plays an important role in the missing fraction of groundwater DOC (31-9/4%). © Author(s) 2019. CC Attribution 4.0 license.en_AU
dc.identifier.articlenumberEGU2019-12506en_AU
dc.identifier.booktitleGeophysical Research Abstractsen_AU
dc.identifier.citationOudone, P., Mustonen, O., Marjo, C. E., Meredith, K., Mcdonough, L., Rutlidge, H., Andersen, M. S., O'carroll, D., & Baker, A. (2019). Extent and characterisation of natural groundwater organic matter sorption onto minerals. Paper presented to the EGU General Assembly 2019, Vienna, Austria, 7-12 April 2019. In Geophysical Research Abstracts, Vol. 21, EGU2019-12506. Retrieved from: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-12506.pdfen_AU
dc.identifier.conferenceenddate12 April 2019en_AU
dc.identifier.conferencenameEGU General Assembly 2019en_AU
dc.identifier.conferenceplaceVienna, Austriaen_AU
dc.identifier.conferencestartdate7 April 2019en_AU
dc.identifier.otherEGU2019-12506en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-12506.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15066en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherCopernicus GmbHen_AU
dc.subjectGround wateren_AU
dc.subjectOrganic matteren_AU
dc.subjectSorptionen_AU
dc.subjectMineralsen_AU
dc.subjectRiversen_AU
dc.subjectAquifersen_AU
dc.subjectAustraliaen_AU
dc.subjectChromatographyen_AU
dc.titleExtent and characterisation of natural groundwater organic matter sorption onto mineralsen_AU
dc.typeConference Abstracten_AU
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