{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/89101"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/89101","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Method for investigating the hygroscopic and optical character of organic carbon in atmospheric aerosols","abstract":"The hygroscopic and optical characteristics of organic carbon aerosols impact the radiative energy balance of the atmosphere, and therefore Earth’s climate. This thesis discusses the development of a method to fractionate organic carbon according to climate-relevant properties. Ion-exchange High Performance Liquid Chromatography (IE-HPLC) is developed as a single analytical method to provide information on both water affinity (via column affinity) and wavelength-dependent optical absorption of the water-soluble organic carbon (WSOC) component of the aerosol. This method is applied to organic aerosol generated by burning and pyrolyzing biomass. The IE-HPLC method can fractionate WSOC, generated from a range of combustion conditions, into several distinct groups using gradients of two solvents in the liquid phase. The retention times of these compounds lies within the range of organic standards. Furthermore, the immersion of WSOC into salty or acidic aqueous environments increased the absorbance of the fractionated peaks by an order of magnitude. This increase did not scale with the amount of WSOC extracted from the samples. A correlation between chromatographic retention time and spectral absorption was found: WSOC fractions that exhibit stronger column affinity and hence water affinity were also found to absorb more intensely at longer wavelengths, up to about 400 nm.","abstract_html":"The hygroscopic and optical characteristics of organic carbon aerosols impact the radiative energy balance of the atmosphere, and therefore Earth’s climate. This thesis discusses the development of a method to fractionate organic carbon according to climate-relevant properties. Ion-exchange High Performance Liquid Chromatography (IE-HPLC) is developed as a single analytical method to provide information on both water affinity (via column affinity) and wavelength-dependent optical absorption of the water-soluble organic carbon (WSOC) component of the aerosol. This method is applied to organic aerosol generated by burning and pyrolyzing biomass. The IE-HPLC method can fractionate WSOC, generated from a range of combustion conditions, into several distinct groups using gradients of two solvents in the liquid phase. The retention times of these compounds lies within the range of organic standards. Furthermore, the immersion of WSOC into salty or acidic aqueous environments increased the absorbance of the fractionated peaks by an order of magnitude. This increase did not scale with the amount of WSOC extracted from the samples. A correlation between chromatographic retention time and spectral absorption was found: WSOC fractions that exhibit stronger column affinity and hence water affinity were also found to absorb more intensely at longer wavelengths, up to about 400 nm.","abstract_has_math":false,"creators":["Kanu, Amadu"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Environmental Engineering in Civil Engineering","degree_department":null,"school":null,"contributors":["Bond, Tami C"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-03-02T19:45:21Z","date_published":"2016-03-02T19:45:21Z","updated_at":"2026-07-22T22:26:32Z","subjects":["Ion-Exchange High Performance Liquid Chromatography"],"languages":["en"],"rights":["Copyright 2015 Amadu Kanu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/89101","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bond, Tami C"]},{"key":"dc:creator","label":"Author","values":["Kanu, Amadu"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-03-02T19:45:21Z","2015-12-11","2015-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Environmental Engineering in Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Ion-Exchange High Performance Liquid Chromatography"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Amadu Kanu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/89101"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The hygroscopic and optical characteristics of organic carbon aerosols impact the radiative energy balance of the atmosphere, and therefore Earth’s climate. This thesis discusses the development of a method to fractionate organic carbon according to climate-relevant properties. Ion-exchange High Performance Liquid Chromatography (IE-HPLC) is developed as a single analytical method to provide information on both water affinity (via column affinity) and wavelength-dependent optical absorption of the water-soluble organic carbon (WSOC) component of the aerosol. This method is applied to organic aerosol generated by burning and pyrolyzing biomass. The IE-HPLC method can fractionate WSOC, generated from a range of combustion conditions, into several distinct groups using gradients of two solvents in the liquid phase. The retention times of these compounds lies within the range of organic standards. Furthermore, the immersion of WSOC into salty or acidic aqueous environments increased the absorbance of the fractionated peaks by an order of magnitude. This increase did not scale with the amount of WSOC extracted from the samples. A correlation between chromatographic retention time and spectral absorption was found: WSOC fractions that exhibit stronger column affinity and hence water affinity were also found to absorb more intensely at longer wavelengths, up to about 400 nm.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Amadu Kanu, accepted the attached license on 2015-12-11 at 13:48.","The student, Amadu Kanu, submitted this Thesis for approval on 2015-12-11 at 14:08.","This Thesis was approved for publication on 2015-12-11 at 15:35.","DSpace SAF Submission Ingestion Package generated from Vireo submission #9019 on 2016-03-02 at 12:53:21","Made available in DSpace on 2016-03-02T19:45:21Z (GMT). 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Ion-exchange High Performance Liquid Chromatography (IE-HPLC) is developed as a single analytical method to provide information on both water affinity (via column affinity) and wavelength-dependent optical absorption of the water-soluble organic carbon (WSOC) component of the aerosol. This method is applied to organic aerosol generated by burning and pyrolyzing biomass. The IE-HPLC method can fractionate WSOC, generated from a range of combustion conditions, into several distinct groups using gradients of two solvents in the liquid phase. The retention times of these compounds lies within the range of organic standards. Furthermore, the immersion of WSOC into salty or acidic aqueous environments increased the absorbance of the fractionated peaks by an order of magnitude. This increase did not scale with the amount of WSOC extracted from the samples. A correlation between chromatographic retention time and spectral absorption was found: WSOC fractions that exhibit stronger column affinity and hence water affinity were also found to absorb more intensely at longer wavelengths, up to about 400 nm.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Amadu Kanu, accepted the attached license on 2015-12-11 at 13:48.","The student, Amadu Kanu, submitted this Thesis for approval on 2015-12-11 at 14:08.","This Thesis was approved for publication on 2015-12-11 at 15:35.","DSpace SAF Submission Ingestion Package generated from Vireo submission #9019 on 2016-03-02 at 12:53:21","Made available in DSpace on 2016-03-02T19:45:21Z (GMT). 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