【英文标准名称】:Ureaforindustrialuse;Determinationofbiuretcontent;Flameatomicabsorptionandphotometricabsorptionmethods
【原文标准名称】:工业用尿素缩二脲含量的测定火焰原子吸收和光度吸收法
【标准号】:ISO4274-1977
【标准状态】:作废
【国别】:国际
【发布日期】:1977-10
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC47
【标准类型】:()
【标准水平】:()
【中文主题词】:化合物;脲;缩二脲;分光光度测量分析;分光光度法;含量测定;化学分析和试验;连接;化学分析
【英文主题词】:chemicalanalysis;ureas;determinationofcontent;biuret;spectrophotometry;chemicalanalysisandtesting;spectrophotometricanalysis;chemicalcompounds;connections;urea
【摘要】:Applicabletoproductshavingcontentsofequaltoormorethan0.05%(m/m)(withflameatomicabsorption)or0.1%(m/m)(withfotometricabsorption).Coverstheformationofacomplexbetweenbiuretandcopper(II)sulphateinalkalinemedium.Fixationofthiscomplexonananionexchangeresin.ElutionofCufirstwithapotassiumnitratesolutionandthenwithanitricacidsolution.Flameatomicabsorption:aspirationofthesolutionintoanacetylene-airflameandmeasurementoftheabsorptionofthe325-nmlineemittedbyacopperhollow-cathodelamp;orbyphotometricabsorption:formationofacolouredcomplexbetweenCuandzincdibenzyldithiocarbamate,extractionwithcarbontetrachlorideandmeasurementatawavelengthofabout435nm.HasalsobeenapprovedbytheIUPAC.
【中国标准分类号】:G15
【国际标准分类号】:5605;0520
【页数】:5P;A4
【正文语种】:英语