Effect of Borohydride Reduction and pH on the Optical Properties of Humic Substances

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dc.contributor.advisorBlough, Neil Ven_US
dc.contributor.authorSchendorf, Tara Marieen_US
dc.contributor.departmentChemistryen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2014-10-11T05:41:47Z
dc.date.available2014-10-11T05:41:47Z
dc.date.issued2014en_US
dc.description.abstractDespite decades of research, the structural basis for the optical properties of chromophoric dissolved organic matter (CDOM) and humic substances (HS) are still not clear. Through several analytical techniques, it is known that CDOM contains carbonyls (aromatic ketones, aldehydes, and quinones), carboxylic acids, and phenols. The charge-transfer model proposed to explain the optical properties of these materials assigns the short-wavelength absorption (<350 nm) and fluorescence emission to electron donors (phenols) and acceptors (carbonyls), while the long-wavelength absorption is attributed to charge-transfer interactions among these species. Because carbonyls are reducible species a method was developed to eliminate them and to investigate its effects on the optical properties of HS in relation to their structure. In addition, the effect of pH on the optical absorption spectra for both untreated and borohydride reduced HS was examined and related to the deprotonation of carboxylic acids and phenolic moieties.en_US
dc.identifierhttps://doi.org/10.13016/M2RW26
dc.identifier.urihttp://hdl.handle.net/1903/15727
dc.language.isoenen_US
dc.subject.pqcontrolledChemistryen_US
dc.subject.pqcontrolledAnalytical chemistryen_US
dc.subject.pqcontrolledEnvironmental scienceen_US
dc.subject.pquncontrolledBorohydride Reductionen_US
dc.subject.pquncontrolledCharge Transferen_US
dc.subject.pquncontrolledChromophoric Dissolved Organic Matteren_US
dc.subject.pquncontrolledHumic Substancesen_US
dc.subject.pquncontrolledOptical Propertiesen_US
dc.subject.pquncontrolledpHen_US
dc.titleEffect of Borohydride Reduction and pH on the Optical Properties of Humic Substancesen_US
dc.typeThesisen_US

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