【英文标准名称】:Waterquality-Determinationofbiochemicaloxygendemandafterndays(BODn)-Dilutionandseedingmethodwithallylthioureaaddition
【原文标准名称】:水质.数天后生化需氧的测定.加入烯丙基硫醇的稀释和接种法
【标准号】:BSEN1899-1-1998
【标准状态】:现行
【国别】:英国
【发布日期】:1998-12-15
【实施或试行日期】:1998-12-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:生物化学;定义;定义(术语);测定;稀释;稀释法;擒纵机构;数学计算;方法;氮化合物;氧;需氧量;质量;抽样方法;试验结果;试验;疫苗;水;水质分析;水常规(实验);水质;水域
【英文主题词】:Biochemistry;Definition;Definitions;Determination;Dilution;Dilutionmethods;Escapementmechanisms;Mathematicalcalculations;Methods;Nitrification;Oxygen;Oxygendemand;Quality;Samplingmethods;Testresults;Testing;Vaccines;Water;Wateranalysis;Waterpractice;Waterquality;Waters
【摘要】:ThisEuropeanStandardspecifiesadeterminationofthebiochemicaloxygendemandofwatersbydilutionandseedingwithsuppressionofnitrification.Thisstandardisapplicabletoallwatershavingbiochemicaloxygendemandsgreaterthanorequaltothelimitofdetermination3mg/lofoxygenandnotexceeding6000mg/lofoxygen.Forbiochemicaloxygendemandsgreaterthan6000mgofoxygen/l,themethodisstillapplicable,buttheerrorscausedbythenecessarydilutionscaninfluencetheanalyticalqualityofthetestmethodandtheresultsaretobeinterpretedwithcircumspection.Inthisstandardthelimitofdetection,DL,isdefinedasDL=t0,95(f)·2·sB·1+1/n(1)wheresBisthewithinseriesstandarddeviation,t0,95(f)isthestudentt-value,withfisthedegreesoffreedomforthedeterminationofsBandnisthenumberofanalysisfordeterminationoftheblankinananalyticalseries,sBiscalculatedfromdeterminationsofrealsampleswithaBODcontentneartheestimatedDL.Incaseswheretheanalyticalmethoddoesnotrequireanyblankcorrectiontheterm1+1/n(2)isomitted.Theresultsobtainedaretheproductofacombinationofbiochemicalandchemicalreactions.Theydonothavetherigorousandunambiguouscharacterofthoseresultingfrom,forexample,asingle,well-defined,chemicalprocess.Nevertheless,theyprovideanindicationfromwhichthequalityofwaterscanbeestimated.Thetestcanbeinfluencedbythepresenceofvarioussubstances.Thosewhicharetoxictomicroorganisms,forexamplebactericides,toxicmetalsorfreechlorine,willinhibitbiochemicaloxidation.Thepresenceofalgaeornitrifyingmicroorganismscanproduceartificiallyhighresults.Itisabsolutelyessentialthattestsconductedaccordingtothisstandardarecarriedoutbysuitablyqualifiedstaff.AnnexAdescribesalternativeincubationperiods.AnnexBdescribesmultitesting,whichcanbeusedtoobtainenhancedprecisionortodemonstratethepresenceofsubstancestoxictomicroorganisms.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:14P.;A4
【正文语种】:英语


Product Code:SAE AMS3906/7
Title:Glass Non-Woven Fiber Tape and Flat Sheet-Epoxy Resin Impregnated, for Hand and Machine Layup Gl-Iii-33-95 (203)
Issuing Committee:Ams P Polymeric Materials Committee
Scope:This specification covers one type of epoxy-resin-impregnated, non-woven, glass fiber in the form of tape for hand or machine layup and of flat sheet. These products have been used typically in structural composites where a relatively low temperature is required with high strength up to 95 degrees C (203 degrees F), but usage is not limited to such applications.