【英文标准名称】:StandardTestMethodforMeasuringAnionicContaminantsinHigh-PurityWaterbyOn-LineIonChromatography
【原文标准名称】:用联机离子色谱法测量高纯度水中阴离子污染的标准试验方法
【标准号】:ASTMD5996-2005(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2005
【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】:D19.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:anions;highpurity;ionchromatography;on-line;Acetateconcentration;Anioniccontamination;Chlorideanalysis--waterapplications;Contamination--water;Fluoride(ion)analysis;Formate;High-puritywater;Ionchromatography(IC);Nitrate(ion)ana
【摘要】:Inthepower-generationindustry,high-puritywaterisusedtoreducecorrosionfromanions,suchassulfate,chloride,andfluoride.Theseanionsareknowntobedetrimentaltomaterialsofconstructionusedinsteamgenerators,reactorvesselinternalsandrecirculationpiping,heatexchangers,connectivepiping,andturbines.Mostelectricgeneratingplantstrytocontroltheseanionstox003C;1.0x03BC;g/Linthesteamgeneratorfeedwater.Somenuclearpowerplantshavebeenabletocontrolanioncontaminantsatlessthan0.02x03BC;g/L.Theseanionsandotherscauselowproductyieldsinsemiconductormanufacturing.Theyarealsomonitoredandcontrolledatsimilarlylowlevelsasintheelectricpowerindustry.Lowmolecularweightorganicacids(acetate,formate,propionate)havebeendetectedinsteamgeneratorfeedwater.Theselowmolecularweightorganicmaterialsarebelievedtobehigh-temperaturedegradationproductsofchemicalsusedtocontrolcyclewaterpHandorganiccontaminantsincyclemakeupwater.Inthesemiconductorindustry,anioncontaminantsmaycomefromthebreakdownoflowmolecularweightorganicmaterialsbyultravioletlightradiation,whichisfrequentlyusedtoproducebacteria-freewater.Theseorganiccompoundsmayalsocontributetolowproductyield.Theproductionofhigh-puritywaterforprocessmakeupandusefrequentlyemploystheuseofdemineralizerstoremoveunwantedanioncontaminants.Alsointheelectricpowerindustry,demineralizersareusedintheprocessstreamtomaintainlowlevelsofthesecontaminants.Assuch,itisimportanttomonitorthisprocesstoensurethatwaterqualitystandardsarebeingmet.Theseprocessescanbemonitoredfortheabove-mentionedanions.On-linemeasurementsofthesecontaminantsprovideagreaterdegreeofprotectionoftheprocessesbyallowingforfrequenton-linemeasurementofthesespecies.Earlydetectionofcontaminantingressallowsforquickercorrectiveactiontolocate,reduce,oreliminate,orcombinationthereof,thesource.Grabsampleswillnotprovidethesamelevelofprotectionbecauseoftheirintermittentnatureandthelongertimerequiredtoobtainandthenanalyzethesample.Additionally,on-linemonitoringsignificantlyreducesthepotentialforcontaminationofhigh-puritywatersamples,asignificantproblemwhensamplingandtestinghigh-puritywater.1.1Thistestmethodcoverson-lineanalysisofhigh-puritywaterbytheionchromatographytechnique.Thistestmethodisapplicableformeasuringvariousanioniccontaminantsinhigh-puritywater,typicallyintherangeof0.01to100x03BC;g/L.Thistestmethodisusedtodeterminetheconcentrationofacetate,formate,chloride,fluoride,phosphate,nitrate,andsulfateinacontinuouslyflowingsample.Therangeofthetestmethodisonlyasgoodasthereagentwateravailableforpreparingstandards.Atextremelylowconcentrations,x003C;1.0x03BC;g/L,preparingstandardsisdifficult,andextracaremustbetakenintheirpreparation.Thesamplemayhavetobeconditionedfromhigherpressuresandtemperaturestoconditionsthataresuitableforusebyon-lineinstruments.1.2Onlinesampleanalysisofflowingstreamsdoesnotlenditselftocollaborativestudiesduetothenatureofthesampleandthepossibilityofcontaminationthatmayresultfromhandlingthesampleaspartofthecollaborativestudy.Thereforethisstandardtestmethodisnotbasedontheresultsofacollaborativestudybutisintendedtoprovidethebestpossibleguidancefordoingthistypeofanalysis.1.3Thisstandarddoesnotpurporttoad......
【中国标准分类号】:Z16
【国际标准分类号】:71_040_50
【页数】:6P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 径向车刀刀座用靠模尺支架 |
| 中标分类： |
机械 >>
金属切削机床 >>
机床辅具与附件 |
| 发布日期： | 1978-05-24 |
| 实施日期： | 1978-12-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 3页 |
适用范围
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前言
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引用标准
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所属分类： 机械 金属切削机床 机床辅具与附件