ASTM D1426-2003 水中氨态氮的标准测试方法

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【英文标准名称】:StandardTestMethodsforAmmoniaNitrogenInWater
【原文标准名称】:水中氨态氮的标准测试方法
【标准号】:ASTMD1426-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:D19.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:氨态氮;含量测定;水;试验
【英文主题词】:ammonia;analysis;calorimetric;electrode;water;
【摘要】:Nitrogenisanutrientintheenvironmentandisnecessarytosustaingrowthofmostorganisms.Itexistsinseveralformssuchasnitrate,nitrite,organicnitrogensuchasproteinsoraminoacids,andammonia.Ammoniaisacolorless,gaseouscompoundwithasharpdistinctiveodor.ItishighlysolubleinwaterwhereitexistsinamolecularformassociatedwithwaterandinanionizedformasNH4+.TheextentofassociationorionizationisdependentonthetemperatureandpH.Itmayalsobetoxictoaquaticlife.Theextentoftoxicityisdependentuponspeciesandextentofdissociation.7Ammoniamayoccurinwaterasaproductofanaerobicdecompositionofnitrogencontainingcompoundsorfromwastestreamscontainingammonia.1.1Thesetestmethodscoverthedeterminationofammonianitrogen,exclusiveoforganicnitrogen,inwater.Twotestmethodsareincludedasfollows:SectionsTestMethodA8212;DirectNesslerization7to15TestMethodB8212;IonSelectiveElectrode16to241.2TestMethodAisusedfortheroutinedeterminationofammoniainsteamcondensatesanddemineralizereffluents.1.3TestMethodBisapplicabletothedeterminationofammonianitrogenintherangefrom0.5to1000mgNH3N/Ldirectlyinreagentandeffluentwaters.Higherconcentrationscanbedeterminedfollowingdilution.Thereportedlowerrangeisbasedonmultiple-operatorprecision.Lowerlimitshavebeenobtainedbytwoofthetwelvelaboratoriesparticipatingintheroundrobin.1.4BothtestmethodsAandBareapplicabletosurfaceandindustrialwatersandwastewatersfollowingdistillation.Thetestmethodfordistillationgiveninhasbeenusedinthepasttomeetrequirementsforpredistillationofsamplesbeinganalyzedforammonia.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.6ThedistillationmethodnowappearsasAppendixX1andisprovidedasnonmandatoryinformationonly.Theautomatedcolorimetricphenatemethodhasbeendiscontinued.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:7P.;A4
【正文语种】: