AS 4489.6.1-1997

没份都是自己花钱购买的 几十块一份的东西在这边花点财富值就能换到应该值了吧

1AS4489.6.1—1997

AustralianStandard®

Testmethodsforlimesandlimestones

Method6.1:Limeindex—Availablelime

1SCOPETheavailablelimeindexofquicklimeandhydratedlimedesignatesthoseconstituentsthatenterintothereactionundertheconditionsofthisspecifiedtestmethod,otherwiseknownasthe‘rapidsugartestmethod’.Theinterpretationofresultsobtainedbythistestmethodisrestrictedbythisdefinition.ThistestmethodisbasedonASTMC25,TestMethodsforChemicalAnalysisofLimestone,QuicklimeandHydratedLime.2PRINCIPLEThesampleisslakedanddispersedwithwater.Thelimeissolubilizedbyreactionwithsugartoformcalciumsucrate,whichisthendeterminedbytitrationagainststandardacidandusingphenolphthaleinastheindicator.

3

3.1

4APPARATUSBalance—analyticaltypeaccurateto0.0003g.REAGENTS

4.1Hydrochloricacid,standard(1.000mol/L)Asolutionshouldbepreparedbydiluting98mLofHCl(32%w/w)or83mLofHC1(36%w/w)to1Lwithdistilledwater.Standardizationofthestocksolutionshouldbeperformedonaregularbasis,ataminimumofoncepermonth.

Concentrationsdifferentfrom1mol/Lmaybeused.

4.2

4.2.1

(a)StandardizationofHC1withNa2CO3ProcedureTheprocedureisasfollows:Transferapproximately20gofprimarystandardanhydroussodiumcarbonate

(Na2CO3)toaplatinumdishorcrucible,anddryat250°Cfor4h.Coolinadesiccator.

Weighaccurately4.4gtothenearest0.1mgofthedriedNa2CO3andtransferto500mLErlenmeyerflask.Add50mLofdistilledwater,swirltodissolvethecarbonate,andaddtwodropsof0.1%solutionofmethylredinalcohol.TitratewiththeHClsolutionuntilthefirstappearanceofredcolour,andboilthesolutioncarefullyuntilthecolourisdischarged(seeNotetoClause4.2.2).Cooltoroomtemperature,andcontinuethetitration,alternatingtheadditionofHC1solutionandtheboilingandcoolingtothefirstappearanceofafaintredcolourthatisnotdischargedonfurtherheating.(b)

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