【英文标准名称】:StandardTestMethodforLow-LevelTotalSilicainHigh-PurityWaterbyFlamelessAtomicAbsorptionSpectroscopy
【原文标准名称】:用无焰原子吸收光谱法测量高纯度水中低量硅总量的标准试验方法
【标准号】:ASTMD4517-2004
【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】:水;试验;纯度;含量测定;光谱测定法
【英文主题词】:atomicspectroscopy;boilerwater;graphitefurnace;high-puritywater;silica
【摘要】:Controlofsilicainboilerfeedwaterandboilerwaterisnecessarytominimizetheformationofscale-formingsilicatesthatdecreaseheattransferintheboiler.Volatilizationandcarryoverofsilicawiththesteammaycausehard,glassysiliceousdepositstoformonturbinebladesthatreduceturbineefficiency.Colloidalsilicathatisnotremovedbyboilerwaterpretreatmentprocessesmaybesolubilizedintheboilerandthuscontributetothedissolvedsilicaconcentrationintheboiler.Bothdissolvedandtotalsilicaareofinterest.1.1Thistestmethodcoversthedeterminationoftotalsilicainwater.1.2Thistestmethodisapplicableintherangefrom25to250[mu]g/LofsilicaasSiO.Higherconcentrationsmaybedeterminedbydecreasingthealiquotvolume(seeNote6).Concentrationrangeshouldnotbeextendedbydilution.1.3Thistestmethoddeterminestotalsilica,anddoesnotdistinguishbetweensolubleandinsolubleforms.1.4Thistestmethodwastestedonreagentwateronly.Itistheuser'sresponsibilitytoassurethevalidityofthetestmethodforwatersofothermatrices.1.5Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z16
【国际标准分类号】:71_060_20
【页数】:5P.;A4
【正文语种】: