【英文标准名称】:StandardPracticeforPreparationofSolutionofSolid,PastyandPowderedVegetableTanninExtracts
【原文标准名称】:固体状、浆糊状和粉末状植物鞣皮材料提取物溶液的制备标准实施规范
【标准号】:ASTMD4905-1999(2004)
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:D31.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:植物;鞣皮制件;溶液
【英文主题词】:analyticalsolution;tanninanalysis;vegetabletanninanalysis
【摘要】:Theconcentrationoftanninsinsolid,pasty,andpowderedextractsneedstobereducedtoanalyticalstrengthfortanninanalyses.4.2Vegetabletanninextractsareheterogeneousmixturesofcomponentswithvaryingsolubility.4.3Thesolubilityofsuchextractsisinfluencedbytemperatureandconcentration,whichaffectthedegreeofdispersionandsizeofthecomponentparticles.4.4Sinceextractshavegreatersolubilityinhotwaterthancold,itisdesirabletodissolveanddisperseanextractinhotwaterandthenletthesolutioncoolslowlytostandardroomtemperature.Itisoftendifficulttoreducesamplesofsolidandparticularlypastyextractstospecimensizeandatthesametimeensurerepresentativesampling.Therefore,cautionisadvisedindrawingconclusionsontheprecisionandbiasoftheresultsobtainedonsuchextracts;wheredifficultiesinsamplepreparationareexperienced,littleconfidencecanbeplacedintheresults.1.1Thispracticecoversastandardprocedureforuseinpreparingtheanalyticalsolutionrequiredfortheanalysisofsolid,pasty,orpowderedvegetabletanninextracts.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Y45
【国际标准分类号】:
【页数】:2P.;A4
【正文语种】: