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1、T431cm-99OFFICIALSTANDARD1934TENTATIVESTANDARD1965SUGGESTEDMETHOD1972OFFICIALTESTMETHOD1982CLASSICALMETHOD1988REVISED19991999TAPPITheinformationanddatacontainedinthisdocumentwerepreparedbyatechnicalcommitteeoftheAssociation.ThecommitteeandtheAssociationassumenoliabilityorresponsibilityinc
2、onnectionwiththeuseofsuchinformationordata,includingbutnotlimitedtoanyliabilityorresponsibilityunderpatent,copyright,ortradesecretlaws.Theuserisresponsiblefordeterminingthatthisdocumentisthemostrecenteditionpublished.CAUTION:Thismethodmayrequiretheuse,disposal,orboth,ofchemicalswhichmaypresentse
3、rioushealthhazardstohumans.ProceduresforthehandlingofsuchsubstancesaresetforthonMaterialSafetyDataSheetswhichmustbedevelopedbyallmanufacturersandimportersofpotentiallyhazardouschemicalsandmaintainedbyalldistributorsofpotentiallyhazardouschemicals.Priortotheuseofthistestmethod,theusershoulddeterm
4、inewhetheranyofthechemicalstobeusedordisposedofarepotentiallyhazardousand,ifso,mustfollowstrictlytheproceduresspecifiedbyboththemanufacturer,aswellaslocal,state,andfederalauthoritiesforsafeuseanddisposalofthesechemicals.Inkabsorbencyofblottingpaper1.Scopeandsignificance1.1Thismethodisusedtodeter
5、minetherateatwhichblottingpapersabsorbwritingink.Ityieldsresultsthathavebeenfoundusefulinpredictingandspecifyingtheabsorptivequalityofblottingpapers.1.2Themethodisbasedonthedeterminationofthelengthoftimerequiredtoabsorbcompletely1mLofastandardwritinginkat23C(73.4F).2.Apparatus2.1Dispensingdevi
6、ce,apipetcalibratedtodeliver1.00mL0.01mL,orotherdispensingdevicehavingequalaccuracy.2.2Support,an80-mm(3-in.)insidediametermetalring,a400-mLglassbeaker,orequivalentsupport.2.3Timer,stopwatchorelectrictimerreadinginseconds.3.Material3.1Standardink,madeinaccordancewiththefollowingformulaandmethod
7、ofpreparation:3.1.1FormulaApprovedbythePhysicalPropertiesCommitteeoftheProcess&ProductQualityDivisionTAPPIT431cm-99Inkabsorbencyofblottingpaper/2gramsGallicacid,NationalFormulary,VIIEdition5.0Ferroussulfate,FeSO47H2O,USP7.5
