SomelaboratorydiffusiontestswereconductedwithdiffusiondevicetodeterminethediffusioncoefficientofCr(Ⅵ)ionpassingthroughDalianredclaysamples.TheconcentrationsofCr(Ⅵ)atdifferentplacesofthesampleswerethenmeasuredspectrophotometricallyafterastandingtimeof1000d.Aone-dimensionalsolutetransportequationwasusedtosimulatethetransportofCr(Ⅵ)throughclaysamples.Back-calculationofdiffusioncoefficientofCr(Ⅵ)wasmadewithfinitedifferencemethod.Parametricanalysiswasconductedtosimulatevariationsinsoildrydensity,temperature,pHandstandingtime.Theresultsshowthatthemethodusedinthispaperissimpleandeffective.ThediffusioncoefficientofCr(Ⅵ)inDalianredclayvariesfrom1.50×10-7cm2/sto2.08×10-7cm2/s.After1000ddiffusion,theconcentrationofthesourcesolutiondropsdownto1.27mg/Lfrom62.5mg/L,andthediffusiondistanceisonly3.5cm.Undertheassumptionthatdiffusioncoefficientisconstant,thediffusioneffectbecomesmoreobviouswithlowerdensity,lowertemperature,higherpHvalue,andmuchmoretime.
