BS EN 12338-1998 水质.汞的测定.汞齐化增量法
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【英文标准名称】:Waterquality-Determinationofmercury-Enrichmentmethodsbyamalgamation
【原文标准名称】:水质.汞的测定.汞齐化增量法
【标准号】:BSEN12338-1998
【标准状态】:作废
【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】:干扰(化学);试验设备;再现性;化学分析和试验;校正;还原法;汞;地表水;文献索引;有毒物质;汞齐合金;地下水;质量;试样;试样制备;水质试验;含量测定;水;精密度
【英文主题词】:Amalgams;Chemicalanalysisandtesting;Contamination;Definition;Definitions;Determinationofcontent;Groundwater;Impurities;Mercury;Mercury-cellprocess;Ratings;Reduction;Reductionmethods;Samplingmethods;Sewage;Surfacewater;Testequipment;Testing;Wateranalysis;Waterpollution;Waterpractice;Waterquality;Watertesting
【摘要】:ThisEuropeanStandardspecifiesthedeterminationofmercuryintwopartswhichuseeithertin(Ⅱ)chlorideorsodiumtetrahydroborateasreducingagent.Themethodsdescribedinclauses4and5aresuitableforthedeterminationofmercuryinwater,forexampleinground,surfaceandwastewaters,intheconcentrationrangefrom0,01μg/1to1μg/l.Higherconcentrationsmaybedeterminedifthewatersampleisdiluted.Thetotalmercurycontentofwaterisdeterminedafterdigestionofthesample.Ifonlysolublemercurycompoundsaretobedetermined,afiltrationstepusinga0,45μmmembranefilterisappliedpriortodigestion.Mono-ordivalentmercuryisreducedtotheelementalformbyareducingagentsuchastin(Ⅱ)chloride,SnCl2,orsodiumtetrahydroborate,NaBH4,inanacidmedium.Elementalmercuryisthenstrippedfromthesolutionwiththeaidofastreamofinertgasandtransportedoveranoblemetalsurfacewithalargearea,suchasgold/platinumgauze,onwhichthemercuryisadsorbed.Themercuryisreleasedbyrapidheatingoftheadsorbantandfurthertransportedinastreamofcarriergastoasuitablecuvette.Absorbancesaremeasuredatawavelengthof253,7nmintheradiationbeamofanatomicabsorptionspectrometer.Concentrationsarecalculatedusingacalibrationcurve.Inordertofullydecomposeallofthemercurycompounds,adigestionprocedureisrequired.Digestioncanbeomittedonlyifitiscertainthatthemercuryconcentrationmaybemeasuredwithoutthispretreatment.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:18P.;A4
【正文语种】:英语
【原文标准名称】:水质.汞的测定.汞齐化增量法
【标准号】:BSEN12338-1998
【标准状态】:作废
【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】:干扰(化学);试验设备;再现性;化学分析和试验;校正;还原法;汞;地表水;文献索引;有毒物质;汞齐合金;地下水;质量;试样;试样制备;水质试验;含量测定;水;精密度
【英文主题词】:Amalgams;Chemicalanalysisandtesting;Contamination;Definition;Definitions;Determinationofcontent;Groundwater;Impurities;Mercury;Mercury-cellprocess;Ratings;Reduction;Reductionmethods;Samplingmethods;Sewage;Surfacewater;Testequipment;Testing;Wateranalysis;Waterpollution;Waterpractice;Waterquality;Watertesting
【摘要】:ThisEuropeanStandardspecifiesthedeterminationofmercuryintwopartswhichuseeithertin(Ⅱ)chlorideorsodiumtetrahydroborateasreducingagent.Themethodsdescribedinclauses4and5aresuitableforthedeterminationofmercuryinwater,forexampleinground,surfaceandwastewaters,intheconcentrationrangefrom0,01μg/1to1μg/l.Higherconcentrationsmaybedeterminedifthewatersampleisdiluted.Thetotalmercurycontentofwaterisdeterminedafterdigestionofthesample.Ifonlysolublemercurycompoundsaretobedetermined,afiltrationstepusinga0,45μmmembranefilterisappliedpriortodigestion.Mono-ordivalentmercuryisreducedtotheelementalformbyareducingagentsuchastin(Ⅱ)chloride,SnCl2,orsodiumtetrahydroborate,NaBH4,inanacidmedium.Elementalmercuryisthenstrippedfromthesolutionwiththeaidofastreamofinertgasandtransportedoveranoblemetalsurfacewithalargearea,suchasgold/platinumgauze,onwhichthemercuryisadsorbed.Themercuryisreleasedbyrapidheatingoftheadsorbantandfurthertransportedinastreamofcarriergastoasuitablecuvette.Absorbancesaremeasuredatawavelengthof253,7nmintheradiationbeamofanatomicabsorptionspectrometer.Concentrationsarecalculatedusingacalibrationcurve.Inordertofullydecomposeallofthemercurycompounds,adigestionprocedureisrequired.Digestioncanbeomittedonlyifitiscertainthatthemercuryconcentrationmaybemeasuredwithoutthispretreatment.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:18P.;A4
【正文语种】:英语
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