2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
已閱讀1頁，還剩1頁未讀， 繼續(xù)免費(fèi)閱讀

下載本文檔

版權(quán)說明：本文檔由用戶提供并上傳，收益歸屬內(nèi)容提供方，若內(nèi)容存在侵權(quán)，請進(jìn)行舉報或認(rèn)領(lǐng)

文檔簡介

1、Designation:D6851?02(Reapproved2011)StardTestMethodfDeterminationofContactpHwithActivatedCarbon1ThisstardisissuedunderthefixeddesignationD6851thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptionint

2、hecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1ThismethodistobeusedinthedeterminationofthepHofwa

3、teroninitialcontactwithactivatedcarbon.ThistestmethodisnotmeantasareplacementfTestMethodD3838maygiveadifferentvalue.1.2Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityof

4、theuserofthisstardtoestablishappropriatesafetyhealthpracticestodeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D1193SpecificationfReagentWaterD1293TestMethodsfpHofWaterD3838Test

5、MethodfpHofActivatedCarbonE300PracticefSamplingIndustrialChemicals3.SummaryofTestMethod3.1AsampleofcarbonisstirredwithwaterthepHofthesuspensionismeasured.4.SignificanceUse4.1ThedeterminationofcontactpHcanbeusedasasimplef

6、astmeasurementthatcanallowactivatedcarbonproducersuserstohaveastardmethodfassessingtheeffectvariouscarbonswillhaveontheinitialpHofthewaterincontactwiththecarbon.IthasbeendeterminedthatthereisabiasbetweenthismethodTestMet

7、hodD3838theyarenotequivalent.5.Interferences5.1pHelectrodesusedtomeasurethisquantitycaneventuallybecomecloggedovertimewithcarbonfines.Suitableelectrodescanbefoundwhichhaveadetachablejunctionallowingtheuserwhennecessaryto

8、discardafouledpHmembrane.5.2Distilledwatercanbecomeacidiconsting.MakesurethatthewaterusedmeetstheminimumrequirementsfASTMTypeIIwater.DeterminethepHasindicatedinTestMethodD1293.6.Apparatus6.1ApHmeter(ambienttemperatureof2

9、5CisassumedifotherwisetemperaturecompensationisrequiredfaccuratepHmeasurement.6.2AcombinationpHelectrodeglasscalomelelectrodesusedtogether.6.3A100mL(TD)graduatedcylinder6.4A250mLglassbeaker(feachsample)6.5Apolymercoatedm

10、agicstirbar(feachsample)6.6Magicstirplate6.7Abalancecapableofaccuratelymeasuringto0.1g7.ReagentsMaterials7.1DistilleddeionizedwaterthatmeetstheASTMTypeIIrequirements7.2BufferstocalibratethepHmetertypicallypH4.0pH7.0pH10.

11、08.Hazards8.1ThewaterincontactwiththecarbonmayhaveeitheralowhighpH.Takeprecautionsaccdinglywearnecessaryprotectiveequipmenttopreventinjuriesfromspillssplashes.9.SamplingTestSpecimensTestUnits9.1FollowPracticeE300inthecol

12、lectionpreparationofsamples.10.PreparationofApparatus10.1UsetheprocedureofTestMethodsD1293tostardizethepHmeterbefemeasurement.11.CalibrationStardization11.1Seeabovesection.1ThisspecificationisunderthejurisdictionofASTMCo

13、mmitteeD28onActivatedCarbonisthedirectresponsibilityofSubcommitteeD28.02onLiquidPhaseEvaluation.CurrenteditionapprovedSept.12011.PublishedNovember2011.iginallyapprovedin2002.Lastpreviouseditionapprovedin2007asD6851–02(20

14、07).DOI:10.1520D685102R11.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternati

15、onal100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates112.Conditioning12.1Thesampleshouldbetestedasreceived.13.Procedure13.1Arepresentativesampleshouldbetakenfromthequantitytobetestedpreparedftesting(asrec

16、eived).13.2Ten(10)gramsofsample(asreceived)willbeusedfthetest.Place10gofarepresentativesampleintoa250mLbeaker.13.3ThepHofthewatertobeusedshouldbedeterminedrecdedbefeuse.13.4Usingagraduatedcylindermeasureadd100mLofwaterto

17、thetengramsampleinthebeaker.13.5Addonestirbarstirftenminuteswithsufficientturbulencetofluidizethesampleinthebeaker.(Warning—toovigousstirringshouldbeavoidedasthismayintroduceairintothesampleaffectingpH.)13.6Stopstirringw

18、ithoutdelayfilteringmeasurethepHofthesuspension.14.CalculationInterpretationofResults14.1Nocalculationsarenecessaryifthemeterresultsarealreadytemperaturecrected.15.Rept15.1Reptthevaluefromstep13.6asthecontactpH.16.Precis

19、ionBias16.1Basedonlimitedinfmationfromonelabatywithonesampletestedintriplicatetherepeatabilitystarddeviationsthe95%repeatabilitylimitsare:ContactpH(avg.of3)StardDeviation95%ConfidenceLimits8.50.22.35%16.2Theinterlabatybi

20、asofthismethodhasnotbeenquantitativelydeterminedbutithasbeenobservedthatitisnotequivalenttoTestMethodD3838shouldnotbeconfusedwithmeanttoreplacethatmethod.17.Keywds17.1activatedcarboncontactpHASTMInternationaltakesnoposit

21、ionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofinfringementofsuchrightsareentir

22、elytheirownresponsibility.Thisstardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.Yourcommentsareinvitedeitherfrevisionofthisstardfaddition

23、alstardsshouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.Ifyoufeelthatyourcommentshavenotreceivedafairhearingyousho

24、uldmakeyourviewsknowntotheASTMCommitteeonStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualreprints(singlemultiplecopies)ofth

25、isstardmaybeobtainedbycontactingASTMattheaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).PermissionrightstophotocopythestardmayalsobesecuredfromtheASTMwebsite(www.astm.gCOPYRIGHT).D

溫馨提示

  • 1. 本站所有資源如無特殊說明，都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等，如果需要附件，請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙，網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽，若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 眾賞文庫僅提供信息存儲空間，僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理，對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯，并不能對任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容，請與我們聯(lián)系，我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。

評論

0/150

提交評論