ASTM D 1193water quality

ASTMD1193waterqualityASTMD1193-91的重点内容如下D1193StandardSpecificationforReagentWaterDevelopedbySubcommittee:D19.02Year:99e1Pages:3Scope:1.1Thisspecificationcoversrequirementsforwatersuitableforuseinmethodsofchemicalanalysisandphysicaltesting.Fourgradesarespecified:TypeITypeIITypeIIITypeIVElectricalconductivity,max,µS/cmat298K(25oC)0.0561.00.25  5.0Electricalresistivity,min,Mcmat298K(25oC)181.04.0     0.2pHat298K(25oC)AAA                   5.0to8.0Totalorganiccarbon(TOC),max,µg/L5050200         nolimitSodium,max,µg/L1510                  50Chlorides,max,µg/L1510               50Totalsilica,max,µg/L33500                nolimitMicrobiologicalcontamination-Whenbacteriallevelsneedtobecontrolled,reagentgradetypesshouldbefurtherclassifiedasfollows:TypeATypeBTypeCMaximumheterotrophicbacteriacount10/1000mL10/100mL100/10mLEndotoxin,EU/mlB0.030.25notapplicableAThemeasurementofpHinTypeI,II,andIIIreagentwatershasbeeneliminatedfromthisspecificationbecausethesegradesofwaterdonotcontainconstituentsinsufficientquantitytosignificantlyalterthepH.BEU=EndotoxinUnits.1.2Themethodofpreparationofthevariousgradesofreagentwaterdeterminesthelimitsofimpuritiesandshallbeasfollows:1.2.1TypeIgradeofreagentwatershallbepreparedbydistillationorotherequalprocess,followedbypolishingwithamixedbedofionexchangematerialsanda0.2-µmmembranefilter.Feedwatertothefinalpolishingstepmusthaveamaximumconductivityof20µS/cmat298K(25oC).1.2.2TypeIIgradeofreagentwatershallbepreparedbydistillationusingastilldesignedtoproduceadistillatehavingaconductivityoflessthan1.0µS/cmat298K(25oC).Ionexchange,distillation,orreverseosmosisandorganicadsorptionmayberequiredpriortodistillationifthepuritycannotbeattainedbysingledistillation.Note1—Becausedistillationisaprocesscommonlyreliedupontoproducehighpuritywater,thelevelsspecifiedforTypeIIreagentwaterwereselectedtorepresenttheminimumqualityofwaterthatadistillationprocessshouldproduce.1.2.3TypeIIIgradeofreagentwatershallbepreparedbydistillation,ionexchange,continuouselectrodeionizationreverseosmosis,oracombinationthereof,followedbypolishingwitha0.45-µmmembranefilter.1.2.4TypeIVgradeofreagentwatermaybepreparedbydistillation,ionexchange,continuouselectrodeionizationreverseosmosis,electrodialysis,oracombinationthereof.1.3Thechoiceofoneofthevariousgradesmaybedesignatedbythemethodorbytheinvestigator.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.■美国国家标准(ASTM)电子级纯水的规格A.S.T.M.ELECTRONICSGRADEWATERSTANDARDSPROPERTYTYPEE-1TYPEE-2TYPEE-3TYPEE-4RESISTIVITY18.0MOhm/cm17.5MOhm/cm12.0MOhm/cm0.50MOhm/cmTOTALSILICA5.0ug/l10.0ug/l50.0ug/l1000.0ug/lPARTICLES/ml1310100PARTICLESSIZE0.10micron0.50micron1.0micron10.0micronCOPPER1.0ug/l1.0ug/l2.0ug/l500.0ug/lZINC0.50ug/l1.0ug/l5.0ug/l500.0ug/lNICKEL0.10ug/l1.0ug/l2.0ug/l500.0ug/lSODIUM0.50ug/l1.0ug/l5.0ug/l1000.0ug/lPOTASSIUM2.0ug/l2.0ug/l5.0ug/l500.0ug/lCHLORIDE1.0ug/l1.0ug/l10ug/l1000ug/lNITRATE1.0ug/l1.0ug/l5.0ug/l500.0ug/lPHOSPHATE1.0ug/l1.0ug/l5.0ug/l500.0ug/lSULFATE1.0ug/l1.0ug