Designation:D890−12(Reapproved2016)StandardTestMethodforWaterinLiquidPineChemicals1ThisstandardisissuedunderthefixeddesignationD890;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthequantitativedeterminationofdissolvedoroccludedwaterpresentinanyproportioninliquidpinechemicals,suchasturpentine,pinene,dipentene,pineoil,talloil,andtalloilfattyacids.Threemethodsofmoisturetestingareincluded.TheKarlFishertitrationmethodisthepreferredmethodfortestingtalloil,TestMethodsD803.1.1.1TheKarlFischerTitrationmethodisbasedonthereactionbetweenwaterandacomplexreagent2consistingofiodine,sulfurdioxide,pyridine,andmethanol,wherebytheiodineisconvertedtoacolorlesscompound.Theappearanceofapersistentiodinecolorinthereactionmixtureindicatesthecompleteremovaloffreewaterbyreactionwiththereagent,andtheendpointmaybemeasuredcolorimetrically.Automatictitratorsfindthisendpointbytherestorationofacurrentstrengthwhentheresistanceprovidedbythepresenceofwateriseliminated.Amperometricautomatictitratorsfindthisend-pointbydetectingthecurrentflowthatoccursoncewateriseliminated.1.1.2Thecoulometrictitrationmethoddetermineswatercontentbyelectronicintegrationofacurrentsufficienttogeneratethepreciseamountofiodinefromtherequiredreagenttoreactwiththewaterinthesample.1.1.3Theazeotropicmethodutilizestherelativelylowboilingpointofwater,ascomparedwithothersampleconstituents,inatolueneorxylenematrixsothatwateriscollectedinatrapandmeasured.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse....
