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es000123j

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es000123jGenericNICA-DonnanModelParametersforProtonBindingbyHumicSubstancesCHRISTOPHERJ.MILNE,*,†DAVIDG.KINNIBURGH,†ANDEDWARDTIPPING‡BritishGeologicalSurvey,Wallingford,Oxfordshire,OX108BB,U.K.,andCentreforEcologyandHydrology,WindermereLaboratory,Ambleside,Cumbria,LA220LP,U.K.Forty-ninedatasetsconsistingofliteratureandexperimentaldataforprotonbindingbyfulvicandhumicacidshavebeenanalyzedusingtheNICA-Donnanmodel.Themodelsuccessfullydescribedthebehavioroftheindividualdatasetswithahighdegreeofaccuracyandhighlightedthedifferencesinsitedensityandbindingaffinitybetweenfulvicacids(FA)andhumicacids(HA)whiledemonstratingtheirstrongsimilarities.ThedatahavealsobeenusedtoderivegenericmodeldescriptionsofprotonbindingbyFAandHAthatcanbeusedformodelingintheabsenceofspecificparametersetsfortheparticularhumicsubstanceofinterest.Thesegenericparameterscanprovideestimatesoftheamountofprotonbindingbyawidevarietyofhumicsubstancestowithinapproximately(20%underanygivenconditions.Themaximumsitedensityforprotonsw

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