es000123j
- 岁月如歌
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2019-03-31 21:53:21
文档简介：
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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