ASTM D5542-2004 离子色谱法测定高纯度水中痕量阴离子的标准试验方法

作者:标准资料网 时间:2024-05-15 21:52:58  浏览:8688   来源:标准资料网

【英文标准名称】:StandardTestMethodsforTraceAnionsinHighPurityWaterbyIonChromatography
【原文标准名称】:离子色谱法测定高纯度水中痕量阴离子的标准试验方法
【标准号】:ASTMD5542-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:氯化物含量;硝酸盐含量;乙酸酯;高;磷酸盐;亚硝酸盐;水;甲酸酯;离子交换色谱法;试验;阴离子
【英文主题词】:anion;eluant;ionchromatography;trace
【摘要】:Theanionsfluoride,chloride,andsulfatehavebeenidentifiedasimportantcontributorstocorrosionofhighpressureboilers,electricpowerturbinesandtheirassociatedheatexchangers.Manyelectricpowerutilitiesattempttoreducethesecontaminantsintheirboilerfeedwatertolessthan1x03BC;g/L.Inthesemiconductormanufacturingprocesstheseions,amongothers,havebeenidentifiedasacauseoflowproductyieldand,thus,mustbemonitoredandcontrolledtolevelssimilartothoserequiredbytheelectricpowerindustry.Lowmolecularweightorganicacids,suchasacetateandformate,havebeenfoundinmanysteamgeneratorfeedwatersandcondensates.Theyarebelievedtocomefromthehightemperaturebreakdownoforganicmatterfoundinboilermakeupwater.ItisfeltthattheseorganicacidspromotecorrosionbyloweringthepHofboilerwatersandmayevenbecorrosivethemselves.Suchlowmolecularweightorganicsmayalsobeproducedwhenultravioletlightisusedtoproducebacteria-freewaterforsemiconductorprocessing.Suchpolarorganiccontaminantsaresuspectedofcausingreducedsemiconductoryields.Phosphatesarecommonlyaddedtodrumboilersinthelowmg/Lleveltoprecipitatecalciumandmagnesiumandtherebypreventscaleformation.Ionchromatographycanbeusedtomonitortheconcentrationofsuchchemicalsinboilerwater,aswellasdetectunwantedcarry-overintothesteam.1.1Thesetestmethodscoverthedeterminationoftrace(g/L)levelsoffluoride,acetate,formate,chloride,phosphate,andsulfateinhighpuritywaterusingionchromatographyincombinationwithsamplepreconcentration.Otheranions,suchasbromide,nitrite,nitrate,sulfite,andiodidecanbedeterminedbythismethod.However,sincetheyarerarelypresentinsignificantconcentrationsinhighpuritywater,theyarenotincludedinthistestmethod.Twotestmethodsarepresentedandtheirrangesofapplication,asdeterminedbyacollaborativestudy,areasfollows:RangeTested(956;g/LAdded)LimitofDetection(SingleOperator)(956;g/L)SectionsTestMethodA:7-15Chloride0-240.8Phosphate0-39Sulfate0-551.8TestMethodB:16-22Fluoride0-140.7Acetate0-4146.8Formate0-3465.6