【英文标准名称】:StandardTestMethodforMeasurementofOn-lineIntegratedSamplesofLowLevelSuspendedSolidsandIonicSolidsinProcessWaterbyX-RayFluorescence(XRF)
【原文标准名称】:X射线荧光法测定工艺用水中的低水平悬浮固体物质和离子态固体物质的线上整合样品的标准试验方法
【标准号】:ASTMD6502-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:corrosionproducts;metals;on-linemonitoring;waterquality;x-rayfluorescence;XRF;Automatedprocedures--wateranalysis;Corrosion--waterenvironments;Dissolvedelements(ofwater);Low-levelparticulates;Onlinemonitoring(inwateranalysis);XRF
【摘要】:Corrosionproducts,intheformofparticulateanddissolvedmetals,inthesteamandwatercircuitsofelectricitygeneratingplantsareofgreatconcerntopowerplantoperators.Asidefromindicatingtheextentofcorrosionoccurringintheplant,thepresenceofcorrosionproductshasdeleteriouseffectsonplantintegrityandefficiency.Depositedcorrosionproductsprovidesitesatwhichchemicals,whichareinnocuousatlowlevels,mayconcentratetocorrosivelevelsandinitiateunder-depositcorrosion.Also,corrosionproductsinfeedwaterenterthesteamgeneratingcomponentswheredepositiononheattransfersurfacesreducestheoverallefficiencyoftheplant.Mostplantsperformsometypeofcorrosionproductmonitoring.Themostcommonmethodistosampleforlongtimeperiods,uptoseveraldays,afterwhichlaboratoryanalysisofthecollectedsamplegivestheaveragecorrosionproductleveloverthecollectiontimeperiod.Thismethodologyisreferredtoasintegratedsampling.Withthemorefrequentmeasurementsintheon-linemonitor,atimeprofileofcorrosionproducttransportisobtained.Transienthighcorrosionproductlevelscanbedetectedandmeasured,whichcannotbeaccomplishedwithintegratedsamplingtechniques.Withthisnewlyavailabledata,plantoperatorsmaybegintocorrelateperiodsofhighcorrosionproductlevelswithcontrollableplantoperatingevents.Inthisway,operatorsmaymakemoreinformedoperationaldecisionswithrespecttocorrosionproductgenerationandtransport.1.1Thistestmethodcoverstheoperation,calibration,anddatainterpretationforanon-linecorrosionproduct(metals)monitoringsystem.Themonitoringsystemisbasedonx-rayfluorescence(XRF)analysisofmetalscontainedonmembranefilters(forsuspendedsolids)orresinmembranes(forionicsolids).SincetheXRFdetectorissensitivetoarangeofemissionenergy,thistestmethodisapplicabletosimultaneousmonitoringoftheconcentrationlevelsofseveralmetalsincludingtitanium,vanadium,chromium,manganese,iron,cobalt,nickel,copper,zinc,mercury,lead,andothersinaflowingsample.Adetectionlimitbelow1ppbcanbeachievedformostmetals.1.2Thistestmethodincludesadescriptionoftheequipmentcomprisingtheon-linemetalsmonitoringsystem,aswellas,operationalproceduresandsystemspecifications.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【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