Designation:D6919−17StandardTestMethodforDeterminationofDissolvedAlkaliandAlkalineEarthCationsandAmmoniuminWaterandWastewaterbyIonChromatography1ThisstandardisissuedunderthefixeddesignationD6919;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodisvalidforthesimultaneousdetermi-nationoftheinorganicalkaliandalkalineearthcations,lithium,sodium,potassium,magnesium,andcalcium,aswellastheammoniumcationinreagentwater,drinkingwater,andwastewatersbysuppressedandnonsuppressedionchromatog-raphy.1.2Theanticipatedrangeofthetestmethodis0.05–200mg/L.Thespecificconcentrationrangestestedforthistestmethodforeachcationwereasfollows(measuredinmg/L):Lithium0.4–10.0Sodium4.0–40.0Ammonium0.4–10.0Potassium1.2–20.0Magnesium2.4–20.0Calcium4.0–40.01.2.1Theupperlimitsmaybeextendedbyappropriatedilutionorbytheuseofasmallerinjectionvolume.Insomecases,usingalargerinjectionloopmayextendthelowerlimits.Itistheresponsibilityoftheusertoensurethevalidityofthistestmethodforconcentrationsiftherangeisextended.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Itistheuser’sresponsibilitytoensurethevalidityofthesetestmethodsforwatersofuntestedmatrices.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forhazardsstatementsspecifictothistestmethod,see8.3.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Comm...
