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【英文标准名称】:Ophthalmicoptics-Spectacleframes-Measuringsystemandterminology(ISO8624:2002);GermanversionENISO8624:2002
【原文标准名称】:眼科光学.眼镜框.测量系统和术语(ISO8624:2002);德文版本ENISO8624:2002
【标准号】:ENISO8624-2002
【标准状态】:现行
【国别】:
【发布日期】:2002-06
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:眼科光学;眼镜(夹鼻);尺寸测量;光学仪器;光学;对视力的帮助;测量;识别标志;眼科学;眼科设备;尺寸;仪器;定义;眼镜架;测量技术;光学设备;测量系统;测量系统;术语;作标记
【英文主题词】:Aidtovision;Definition;Definitions;Dimensionalmeasurement;Dimensions;Distinguishingsigns;Instruments;Marking;Measurement;Measuringsystems;Measuringtechniques;Ophtalmicoptics;Ophthalmicequipment;Ophthalmology;Opticalequipment;Opticalinstruments;Optics;Spectacleframes;Spectacles(eyeglasses);Systemofmeasurement;Terminology
【摘要】:
【中国标准分类号】:Y89
【国际标准分类号】:01_040_11;11_180_30
【页数】:9P.;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforHydrazineinWater
【原文标准名称】:水中联氨的标准试验方法
【标准号】:ASTMD1385-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:联氨;测试;水
【英文主题词】:hydrazine;water-inorganicconstituents;hydrazineinwater,test
【摘要】:Hydrazineisaman-madechemicalandisnotfoundinnaturalwaters.Thedeterminationofhydrazineisusuallymadeonboilerfeedwaters,processwaters,andotherwatersthathavebeentreatedwithhydrazine(N2H4)forthepurposeofmaintainingresidualstopreventcorrosionbydissolvedoxygen.Thisreducingchemicalreactswithdissolvedoxygentoformnitrogenandwater.However,undercertainconditionsitcanalsodecomposetoformammoniaandnitrogen.Hydrazineisusedextensivelyasapreboilertreatmentchemicalforhigh-pressureboilerstoscavengesmallamountsofdissolvedoxygenthatarenotremovedbymechanicalaeration.Ithastheadvantageoversulfitetreatmentinthatitdoesnotproduceanydissolvedsolidsintheboilerwater.Hydrazineisoftendeterminedinconcentrationsbelow0.1mg/L.However,inlayupsolutionsfortheprotectionofidleboilers,hydrazinemaybepresentinconcentrationsashighas200mg/L.Additionally,hydrazineprovidesprotectionwherereducingconditionsarerequired,particularlyinmixedmetallurgysystemsfortheprotectionofthecopperalloys.Hydrazineisasuspectedcarcinogenandathresholdlimitvalueintheatmosphereof1.0mg/LhasbeensetbyOSHA.Wheninanaqueoussolution,hydrazinewilloxidizetonitrogenandwaterinthepresenceofairoverarelativelyshortperiodoftime.1.1Thistestmethodcoversthecolorimetricdeterminationofhydrazineinboilerfeedwaters,condensates,natural,andwellwatersthathavebeentreatedwithhydrazine(N2H4).Thistestmethodisusableintherangefrom5.0to200g/L(ppb)hydrazine.Therangeisforphotometricmeasurementsmadeat458nmin50mmcell.Higherconcentrationsofhydrazinecanalsobedeterminedbytakingamoredilutedsample.1.2Itistheusers''responsibilitytoensurethevalidityofthistestmethodforuntestedtypesofwaters.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,see5.3,Note1,andFootnote8.
【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】: