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【英文标准名称】:StandardTestMethodforOn-LineMeasurementofLow-LevelDissolvedOxygeninWater
【原文标准名称】:水中低水平溶解氧在线测量的标准试验方法
【标准号】:ASTMD5462-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:dissolvedoxygen;galvaniccell;oxygen;polarographicsensor;Boilerfeedwater;Dissolvedoxygen(DO);Galvaniccell;Onlinemonitoring(inwateranalysis);Oxygendemand(inwater);Polarographicmethods;Totaloxygendemand(TOD)
【摘要】:DOmaybeeitheracorrosiveorpassivatingagentinboiler/steamcyclesandisthereforecontrolledtospecificconcentrationsthatarelowrelativetoenvironmentalandwastewatertreatmentsamples.Out-of-specificationDOconcentrationsmaycausecorrosioninboilersystems,whichleadstocorrosionfatigueandcorrosionproductsx2014;alldetrimentaltothelifeandefficientoperationofasteamgenerator.TheefficiencyofDOremovalfromboilerfeedwaterbymechanicalorchemicalmeans,orboth,maybemonitoredbycontinuouslymeasuringtheDOconcentrationbeforeandaftertheremovalprocesswithon-lineinstrumentation.DOmeasurementisalsoacheckforairleakageintotheboilerwatercycle.Guidelinesforfeedwatertohigh-pressureboilerswithallvolatiletreatmentgenerallyrequireafeedwaterDOconcentrationbelow5x03BC;g/L(3).Boilerfeedwaterwithoxygenatedtreatmentismaintainedinarangeof50to300x03BC;g/LDO(4).Inmicroelectronicsproduction,DOcanbedetrimentalinsomemanufacturingprocesses,forexample,causingundesirableoxidationonsiliconwafers.1.1Thistestmethodcoverstheon-linedeterminationofdissolvedoxygen(DO)inwatersamplesprimarilyinrangesfrom0to500x03BC;g/L(ppb),althoughhigherrangesmaybeusedforcalibration.On-lineinstrumentationisusedforcontinuousmeasurementsofDOinsamplesthatarebroughtthroughsamplelinesandconditionedfromhigh-temperatureandhigh-pressuresourceswhennecessary.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecifichazardsstatements,see6.5.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:6P.;A4
【正文语种】:英语