Designation:D4517−15StandardTestMethodforLow-LevelTotalSilicainHigh-PurityWaterbyFlamelessAtomicAbsorptionSpectroscopy1ThisstandardisissuedunderthefixeddesignationD4517;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftotalsilicainwater.1.2Thistestmethodisapplicableintherangefrom25to250µg/LofsilicaasSiO2.Higherconcentrationsmaybedeterminedbydecreasingthealiquotvolume(seeNote6).Concentrationrangeshouldnotbeextendedbydilution.1.3Thistestmethoddeterminestotalsilica,anddoesnotdistinguishbetweensolubleandinsolubleforms.1.4Thistestmethodwastestedonreagentwateronly.Itistheuser’sresponsibilitytoassurethevalidityofthetestmethodforwatersofothermatrices.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D859TestMethodforSilicainWaterD1066PracticeforSamplingSteamD1129TerminologyRelatingtoWaterD1192GuideforEquipmentforSamplingWaterandSteaminClosedConduits(Withdrawn2003)3D1193SpecificationforReagentWaterD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWaterD3370PracticesforSamplingWaterfromClosedConduitsD3919PracticeforMeasuringTraceElementsinWaterbyGraphiteFurnaceAtomicAbsorptionSpectrophotometryD4453PracticeforHandlingofHighPurityWaterSamplesD5810GuideforSpikingintoAqueousSamplesD5847PracticeforWritingQualityControlSpecificationsforStandardTestMethodsforWaterAnalysis3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1129.4....
