Quinones and Ketons and Aldihydes对CDOM光学性质的影响

Quinones and Ketons and Aldihydes对CDOM光学性质的影响ContributionofQuinonesandKetones/AldehydestotheOpticalPropertiesofHumicSubstances(HS)andChromophoricDissolvedOrganicMatter(CDOM)RossanaDelVecchio,*,†TaraMarieSchendorf,‡andNeilV.Blough*,‡†EarthSystemScienceInterdisciplinaryCenter,UniversityofMaryland,CollegePark,Maryland20742,UnitedStates‡DepartmentofChemistryandBiochemistry,UniversityofMaryland,CollegePark,Maryland20742,UnitedStates*SSupportingInformationABSTRACT:Themolecularbasisoftheopticalpropertiesofchromophoricdissolvedorganicmatter(CDOM)andhumicsubstances(HS)remainspoorlyunderstoodandyettobeinvestigatedadequately.Thisstudyevaluatestherelativecontributionsoftwobroadclassesofcarbonyl-containingcompounds,ketones/aldehydesversusquinones,totheabsorptionandemissionpropertiesofarepresentativesuiteofHSaswellasaligninsample.Selectivereductionofquinonestohydroquinonesbyadditionofsmallmolarexcessesofdithionitetothesesamplesunderanoxicconditionsproducedsmallornegligiblechangesintheiropticalproper