这个是NOKIA的测试汗液配方参考EN1811:有哪位知道这个来龙去脉的?为什么选用这个配方?
Preparingartificialsweat
Transfer1.00±0.01gofurea(ProAnalysisquality),5.00±0.01gofsodiumchloride(PA
quality)and1.14±0.02gor940±20µlofDL-lacticacid(>88%,PAquality)toa1000ml
beaker.Add900mlfreshdistilledwaterandstiruntilalltheaddedreagentsarecompletely
dissolved.CalibratethepH-meterandimmersethepHelectrodeintothebeaker.Stirgently
andcarefullyadddiluteammoniasolution(1%)untilastablevalue6.50±0.10pHhas
reached.Transferthesolutionto1000mlvolumetricflaskandmakeupthevolumewithdistilledwater.Artificialsweatisorganicsolutionandthereforedeteriorationofthesolution
happensquitefast.Fasterthatfivemonthin+5°C.Testsolutionmustbestorageindark
refrigeratoranditmustdiscardassoonasanymarksofspoilingisvisible(moldfungusetc
visibleparticles).Ifstoragebottlecan’tbecompletelycleanedanewbottlewillbeneeded
tostorageanewsolutionothervicemoldstainsarethebaseofnewbacteriapopulation
andtestsolutionwillbespoiledfaster. |