【英文标准名称】:StandardTestMethodforPotassiuminWaterbyAtomicAbsorptionSpectrophotometry
【原文标准名称】:原子吸收分光光度法对水中钾含量的标准试验方法
【标准号】:ASTMD4192-2008
【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】:D19.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:analysis;atomicabsorption;potassium;water;Atomicabsorptionspectrophotometry/spectroscopy;Inorganiccompounds--water;Potassiumcontent--water;Spectrophotometry--atomicabsorption(water/wastewater);Totalrecoverableelements(inwater);Waste
【摘要】:Potassiumoccursinrocksinaformthatisnoteasilysolubilized;therefore,thepotassiumcontentofnaturalwatersisusuallylow.Mostnaturalwaterscontainlessthan20mg/Lofpotassium,butwaterscontainingseveralhundredmilligramsperlitreareoccasionallyfound.Potassiumisessentialtoanimalnutrition,butaconcentrationof1000to2000mg/Linstockwaterisregardedastheextremelimitpermissible.1.1Thistestmethodcoversthedeterminationoflowamountsofpotassiuminwatershavinglowsolidscontent.Theapplicablerangeofthistestmethodis0.20to4.0mg/Lwhenusingthe766.5-nmresonanceline.Therangemaybeextendedupwardbydilutionofanappropriatealiquotofsampleorbyusingtheless-sensitive404.4-nmresonanceline.Manyworkershavefoundthatthistestmethodisreliableforpotassiumlevelsto0.02mg/L,butuseofthistestmethodatthislowlevelisdependentontheconfigurationoftheaspiratorandnebulizersystemsavailableintheatomicabsorptionspectrophotometeraswellastheskilloftheanalyst.Theprecisionandbiasdatapresentedareinsufficienttojustifyuseofthistestmethodinthe0.02-mg/Lrange.1.2Thistestmethodhasbeenusedsuccessfullywithspikedreagentwater.Itistheanalyst''sresponsibilitytoensurethevalidityofthistestmethodtootherlowdissolvedsolidsmatrices.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Foraspecificprecautionarystatement,seeNote3.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Plastics-Polyoxymethylene(POM)mouldingandextrusionmaterials-Part1:designationsystemandbasisforspecifications.
【原文标准名称】:塑料.聚甲醛模塑和挤塑材料.第1部分:规范用命名系统和依据
【标准号】:NFT50-009-1-2006
【标准状态】:现行
【国别】:法国
【发布日期】:2006-08-01
【实施或试行日期】:2006-08-05
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:分类;共聚物;数据块;名称与符号;例子;挤压;甲醛;均聚物;作标记;模塑材料;模制材料;塑料;聚甲醛;规范;热塑性聚合物
【英文主题词】:
【摘要】:
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:12P;A4
【正文语种】:其他