汗液PH值研究

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.

[url]http://www.docin.com/p-1078867383.html[/url]
这个应该算是比较有价值的一条线索，不同人种的汗液还有差异，但是没法下载
哪位帮忙下载？
感谢！

:D只知道配制人工汗液，坐等大神来讲标准原理:D