作者:标准资料网 时间:2024-05-17 06:29:08   浏览:8189   来源:标准资料网

【英文标准名称】:StandardTestMethodforOn-LineColorimetricMeasurementofSilica
【原文标准名称】:硅酸盐在线色度测量的标准试验方法
【标准号】:ASTMD7126-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:比色的;直线;测量;硅酸盐;试验
【英文主题词】:colorimetric;on-line;processmeasurement;silica
【摘要】:Silicon(Si),ametalloid,isthesecondmostabundantelementintheearthx2019;scrust.Variousformsofsilica(silicondioxideSiO2)arefoundinquartz,sandandrocks.Thedegradationoftheserocksresultsinsilicafoundinnaturalwaters.Silicainnaturalwaterscanbefoundasionicsilica,silicates,colloidalorsuspendedparticles.Elevatedtemperaturesandpressurecancausesilicainwatertovaporizeandformdepositsorscale.Scaledepositsofsilicawillcoatboilersandturbinebladesusedinpowerplants.Thepresenceofsilicascaleaffectstheabilityofmetalstotransferheat.Silicaneedstoberemovedwhendeionizedwaterisusedasarinseformanufacturingwafersinthesemiconductorindustry.Silicaiscommonlyremovedbydemineralizationusinganionexchangeresins,distillation,reverseosmosisorprecipitationinalimesofteningprocess.Theon-linemeasurementofsilicaisthepreferredmethodtolaboratoryanalysesforindustriestryingtoobtainandmonitorultra-purewater.Sincesilicaisoneofthefirstspeciestobreakthroughanionexchangeresins,on-linesilicamonitoringisfrequentlyusedtodeterminetheneedforregenerationofananionormixedresinbed.1.1Thistestmethodcoverstheon-linedeterminationofsolublesilicainwaterbycolorimetricanalysisusingthemolybdenumbluemethod,alsoknownastheheteropolybluemethod.1.2Thistestmethodisapplicableforsilicadeterminationinwaterwithsilicaconcentrationswithin0.5-5000ppb(g/L).1.3ThistestmethodcoversthedeterminationofsolublesilicaSiO2(silicondioxide)orsilicatesinwater.Solublesilicacompoundsareconsideredmolybdatereactivesilica.Thistestmethoddoesnotcoverthedeterminationofcolloidalorpolymericsilica,whichisconsiderednon-molybdatereactivesilica.1.4Thistestmethoddoesnotcoverthelaboratoryorgrabsamplemeasurementofsilicainwater.RefertoTestMethodD859.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:3P.;A4
【正文语种】: