GB/T 5009.12-2003 食品中铅的测定
作者:标准资料网
时间:2024-05-20 20:22:40
浏览:8274
来源:标准资料网
基本信息
标准名称: | 食品中铅的测定 |
英文名称: | Determination of lead in foods |
中标分类: |
医药、卫生、劳动保护 >>
卫生 >>
食品卫生 |
ICS分类: |
食品技术 >>
食品综合
|
替代情况: | GB/T 5009.12-1996;被GB 5009.12-2010代替 |
发布部门: | 中华人民共和国卫生部 中国国家标准化管理委员会 |
发布日期: | 2003-08-11 |
实施日期: | 2004-01-01 |
首发日期: | 1985-05-16 |
作废日期: | 2010-06-01 |
主管部门: | 卫生部 |
提出单位: | 中华人民共和国卫生部 |
归口单位: | 中华人民共和国卫生部 |
起草单位: | 上海市食品卫生监督检验所 |
起草人: | 闰军、杨惠芬、强卫国、毛红 |
出版社: | 中国标准出版社 |
出版日期: | 2004-01-01 |
页数: | 13页 |
适用范围
本标准规定了食品中铅的测定方法。本标准适用于食品中铅的测定。本方法检出限:石墨炉原子吸收光谱法5μg/kg;氢化物原子荧光光谱法固体试样为5μg/kg,液体试样为1μg/kg;火焰原子吸收光谱法0.1mg/kg;比色法为0.25mg/kg;单扫描极谱法为0.085mg/kg。
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类: 医药 卫生 劳动保护 卫生 食品卫生 食品技术 食品综合
【英文标准名称】:Methodsofsoilinvestigationsforagriculturalwaterengineering-Physicallaboratorytests-Part13:Determinationofsoildensity,totalporevolumeandporenumberofmineralsoils
【原文标准名称】:农业水利工程土壤调查方法.实验室物理试验.第13部分:矿物质土壤的密度、总孔隙容积和气隙率测定
【标准号】:DIN19683-13-1997
【标准状态】:作废
【国别】:德国
【发布日期】:1997-03
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:实验室试验;园林设计;土壤采样;农业;物质;密度;土壤普查;定义;方法;土壤;水力工程;测定
【英文主题词】:Agriculture;Definition;Definitions;Density;Determination;Hydraulicengineering;Investigationmethods;Laboratorytests;Landscaping;Methods;Porevolume;Soilsampling;Soilsurveys;Soils;Substances;Waterpractice
【摘要】:
【中国标准分类号】:B10
【国际标准分类号】:13_080_20;65_060_35
【页数】:3P;A4
【正文语种】:德语
【英文标准名称】:StandardTestMethodforDeterminingtheMolarMassofSodiumAlginatebySizeExclusionChromatographywithMulti-angleLightScatteringDetection(SEC-MALS)
【原文标准名称】:用体积排阻色谱与多角度光散射检测法(SEC-MALS)测定海藻酸钠的摩尔质量的标准试验方法体
【标准号】:ASTMF2605-2008e1
【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】:F04.42
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Alginates;Sizeexclusionchromatographywithmulti-anglelightscatteringdetection(SEC-MALS);Tissueengineeredmedicalproducts(TEMPs)
【摘要】:Thecompositionandsequentialstructureofalginate,aswellasthemolarmassandmolarmassdistribution,determinesthefunctionalityofalginateinanapplication.Forinstance,thegellingpropertiesofanalginatearehighlydependentuponthecompositionandmolarmassofthepolymer.Lightscatteringisoneofveryfewmethodsavailableforthedeterminationofabsolutemolarmassandstructure,anditisapplicableoverthebroadestrangeofmolarmassesofanymethod.Combininglightscatteringdetectionwithsizeexclusionchromatography(SEC),whichsortsmoleculesaccordingtosize,givestheabilitytoanalyzepolydispersesamples,aswellasobtaininginformationonbranchingandmolecularconformation.Thismeansthatboththenumber-averageandmass-averagevaluesformolarmassandsizemaybeobtainedformostsamples.Furthermore,onehastheabilitytocalculatethedistributionsofthemolarmassesandsizes.Multi-anglelaserlightscattering(MALS)isatechniquewheremeasurementsaremadesimultaneouslyoverarangeofdifferentangles.MALSdetectioncanbeusedtoobtaininformationonmolecularsize,sincethisparameterisdeterminedbytheangularvariationofthescatteredlight.Molarmassmayinprinciplebedeterminedbydetectingscatteredlightatasinglelowangle(LALLS).However,advantageswithMALSascomparedtoLALLSare:(1)lessnoiseatlargerangles,(2)theprecisionofmeasurementsaregreatlyimprovedbydetectingatseveralangles,and(3)theabilitytodetectangularvariationallowsdeterminationofsize,branching,aggregation,andmolecularconformation.Sizeexclusionchromatographyusescolumns,whicharetypicallypackedwithpolymerparticlescontaininganetworkofuniformporesintowhichsoluteandsolventmoleculescandiffuse.Whileinthepores,moleculesareeffectivelytrappedandremovedfromtheflowofthemobilephase.Theaverageresidencetimeintheporesdependsuponthesizeofthesolutemolecules.Moleculesthatarelargerthantheaverageporesizeofthepackingareexcludedandexperiencevirtuallynoretention;theseareelutedfirst,inthevoidvolumeofthecolumn.Molecules,whichmaypenetratetheporeswillhavealargervolumeavailablefordiffusion,theywillsufferretentiondependingontheirmolecularsize,withthesmallermoleculeselutinglast.Forpolyelectrolytes,dialysisagainsttheelutionbufferhasbeensuggested,inordertoeliminateDonnan-typeartifactsinthemolarmassdeterminationbylightscattering(1,2).However,inthepresentmethod,thesizeexclusionchromatographystepprecedingthelightscatterdetectionisanefficientsubstituteforadialysisstep.ThesampleisseparatedonSECcolumnswithlargeexcessofelutionbufferfor30to40min,anditisthereforeinfullequilibriumwiththeelutionbufferwhenitreachestheMALSdetector.1.1Thistestmethodcoversthedeterminationofthemolarmassofsodiumalginateintendedforuseinbiomedicalandpharmaceuticalapplicationsaswellasintissueengineeredmedicalproducts(TEMPs)bysizeexclusionchromatographywithmulti-anglelaserlightscatteringdetection(SEC-MALS).AguideforthecharacterizationofalginatehasbeenpublishedasGuideF2064.1.2AlginateusedinTEMPsshouldbewellcharacterized,includingthemolarmassandpolydispersity(molarmassdistribution)inordertoensureuniformityandcorrectfunctionalityinthefinalproduct.Thistestmethodwillassistendusersinchoosingthecorrectalginatefortheirparticularapplication.AlginatemayhaveutilityasascaffoldormatrixmaterialforTEMPs,incellandtissueencapsulationapplications,andindrugdeliveryformulations.1.3Thevalue......
【中国标准分类号】:C10
【国际标准分类号】:11_120_10
【页数】:6P.;A4
【正文语种】:英语