【英文标准名称】:StandardTestMethodforWaterinLiquidNavalStores
【原文标准名称】:液体松脂中水含量的标准试验方法
【标准号】:ASTMD890-1998(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D01.34
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:azeotropic;coulometric,KarlFischer;moisture;navalstores;pineoil;talloil;terpenes;turpentine;water;Moistureanalysis--paints/relatedcoatings/materials;Watercontent--paints/relatedcoatings/materials;Dipentene;Iodine-pyridine-sulfurdioxi
【摘要】:Manynavalstoresproductscontainwaterasaresultoftheprocessesusedfortheirproduction.Typicallyrefinedproductssuchasterpenes,pineoil,talloilfattyacids,anddistilledtalloilcontainonlytracesofwater,butcrudetalloilmightcontain0.5to2.5%ofwater.AlthoughtheKarlFischerandcoulometricmethodsaremostapplicabletolowlevelsofmoisture,thesecanbeandareusedathigherlevels.Theazeotropicdistillationmethodisgenerallyusedathigherlevels.1.1Thesetestmethodscoverthequantitativedeterminationofdissolvedoroccludedwaterpresentinanyproportioninliquidnavalstores,suchasturpentine,pinene,dipentene,pineoil,talloil,andtalloilfattyacids.Threemethodsofmoisturetestingareincluded.TheKarlFishertitrationmethodisthepreferredmethodfortestingtalloil,TestMethodsD803.1.1.1TheKarlFischerTitrationmethodisbasedonthereactionbetweenwaterandacomplexreagentconsistingofiodine,sulfurdioxide,pyridine,andmethanol,wherebytheiodineisconvertedtoacolorlesscompound.Theappearanceofapersistentiodinecolorinthereactionmixtureindicatesthecompleteremovaloffreewaterbyreactionwiththereagent,andtheendpointmaybemeasuredcolorimetrically.Automatictitratorsfindthisendpointbytherestorationofacurrentstrengthwhentheresistanceprovidedbythepresenceofwateriseliminated.Amperometricautomatictitratorsfindthisendpointbydetectingthecurrentflowthatoccursoncewateriseliminated.1.1.2Thecoulometrictitrationmethoddetermineswatercontentbyelectronicintegrationofacurrentsufficienttogeneratethepreciseamountofiodinefromtherequiredreagenttoreactwiththewaterinthesample.1.1.3Theazeotropicmethodutilizestherelativelylowboilingpointofwater,ascomparedwithothersampleconstituents,inatolueneorxylenematrixsothatwateriscollectedinatrapandmeasured.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G50
【国际标准分类号】:87_060_30
【页数】:3P.;A4
【正文语种】:英语