【英文标准名称】:StandardTestMethodforMeasuringtheExchangeComplexandCationExchangeCapacityofInorganicFine-GrainedSoils
【原文标准名称】:测量无机细粒土的交换复合体和阳离子交换量的标准试验方法
【标准号】:ASTMD7503-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bentonite;boundcations;cationexchangecapacity;cations;CEC;clay;exchangecomplex;solublecations
【摘要】:Fine-grainedsoilsareusedinwastecontainmentsystemsasbarrierstoflowandcontaminanttransport.Liquidscontainedbythesebarrierscancontainionsthatmayinteractwiththemineralsurfacesinfine-grainedsoils.Theliquidpassingthroughtheporesoffine-grainedsoilcaninteractwiththemineralsurface,andaffectthephysicalandchemicalcharacteristicsofthesoil.Thismethodcanbeusedaspartofanevaluationoftheseinteractions.Note18212;Thequalityoftheresultproducedbythisstandarddependsonthecompetenceofthepersonnelperformingthetestandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting,sampling,inspection,etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfensurereliableresults.Reliableresultsdependonmanyfactors.PracticeD3740providesameansofevaluatingsomeofthesefactors.1.1Thistestmethoddescribestheproceduresformeasuringthesolubleandboundcationsaswellasthecationexchangecapacity(CEC)offine-grainedinorganicsoils.Claymineralsinfine-grainedsoilscarryanegativesurfacechargethatisbalancedbyboundcationsnearthemineralsurface.Theseboundcationscanbeexchangedbyothercationsintheporewater,whicharereferredtoassolublecations.Thecationexchangecapacityisameasureofthenegativesurfacechargeonthemineralsurface.TheCECgenerallyissatisfiedbycalcium(Ca),sodium(Na),magnesium(Mg),andpotassium(K),althoughothercationsmaybepresentdependingontheenvironmentinwhichthesoilexists.ThistestmethodwasdevelopedfromconceptsdescribedpreviouslyinLavkulich(1981)(1)andRhoades(1982)(2).Insoilswithappreciablegypsumorcalcite,dissolutionofthesemineralswillreleaseCainsolutionthatmayaffectthemeasurement.1.2Inthistestmethod,thesolublesaltsfromthemineralsurfacearewashedoffwithde-ionizedwaterandthentheconcentrationofsolublesaltswithintheextractismeasured.Theboundcationsoftheclayaremeasuredbyusingasolutioncontaininganindexionthatforcestheexistingcationsintheboundlayerintosolution.Thetotalconcentrationsofboundandsolublecationsinthissolutionaremeasured.TheCECismeasuredbydisplacingtheindexionwithanothersaltsolutionandmeasuringtheamountofthedisplacedindexion.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.4AllobservedandcalculatedvaluesshallconformtotheguideforsignificantdigitsandroundingestablishedinPracticeD6026.TheproceduresinPracticeD6026thatareusedtospecifyhowdataarecollected,recorded,andcalculatedareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproceduresdonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsforthe......
【中国标准分类号】:B11
【国际标准分类号】:13_080;71_100_40
【页数】:5P.;A4
【正文语种】:英语