ISO 16590-2000 水质汞的测定汞齐化选法

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【英文标准名称】:Waterquality-Determinationofmercury-Methodsinvolvingenrichmentbyamalgamation
【原文标准名称】:水质汞的测定汞齐化选法
【标准号】:ISO16590-2000
【标准状态】:作废
【国别】:国际
【发布日期】:2000-12
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC147
【标准类型】:()
【标准水平】:()
【中文主题词】:地表水;水常规(实验);水污染;污染;地下水;汞齐合金;水质分析;水质试验;还原法;抽样方法;杂质;汞;还原;汞电解池处理;定义;试验设备;含量测定;额定值;化学分析和试验;试验;水质;污水
【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】:ThisInternationalStandardspecifiestwomethodsforthedeterminationofmercury,oneusingtin(ll)chlorideandtheothersodiumtetrahydroborateasreducingagent.Themethodsaresuitableforthedeterminationofmercuryinwater,forexampleinground,surfaceorwastewater,intheconcentrationrange0,01μg/lto1μg/l.Higherconcentrationsmaybedeterminedifthewatersampleisdiluted.Thetotalmercurycontentofthewaterisdeterminedafterdigestionofthesample.Ifonlysolublemercurycompoundsaretobedetermined,thesampleisfilteredthrougha0,45μmmembranefilterpriortodigestion.Mono-ordivalentmercuryisreducedtotheelementalformbyareducingagentsuchastin(ll)chloride,SnCl2.orsodiumtetrahydroborate,NaBH4,inanacidmedium.Elementalmercuryisthenstrippedfromthesolutionwiththeaidofastreamofinertgaswithnegligiblemercurycontentandtransportedoveranoble-metalsurfacewithalargearea,suchasgold/platinumgauze,onwhichthemercuryisadsorbed.Themercuryisreleasedbyrapidheatingoftheadsorbentandfurthertransportedinastreamofcarriergastoasuitablecuvette.Absorbancesaremeasuredatawavelengthof253,7nmintheradiationbeamofanatomicabsorptionspectrometer.Concentrationsarecalculatedusingacalibrationcurve.Inordertofullydecomposeallofthemercurycompounds,adigestionprocedureisrequired.Digestioncanbeomittedonlyifitiscertainthatthemercuryconcentrationmaybemeasuredwithoutthispretreatment.Carefulconsiderationshouldbegiventowhether,andtowhatextent,particularproblemswillrequirethespecificationofadditionalconditions.ItisabsolutelyessentialthatanalysesconductedinaccordancewiththisInternationalStandardarecarriedoutbysuitablyqualifiedstaff.Innaturalwatersources,mercurycompoundsgenerallyoccuronlyinverysmallconcentrationsoflessthan0,1μg/l.Higherconcentrationsmaybefound,forexample,inwastewater.Bothinorganicandorganiccompoundsofmercurycanbepresent.Mercurymayaccumulateinsedimentandsludge.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:21P.;A4
【正文语种】:英语