【英文标准名称】:StandardTestMethodforAquaticFreeCyanidewithFlowInjectionAnalysis(FIA)UtilizingGasDiffusionSeparationandAmperometricDetection
【原文标准名称】:利用气体扩散分离和安培检测法对水化游离氰化物的流量注入分析(FIA)的标准试验方法
【标准号】:ASTMD7237-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:D19.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:条件;氰化物;检测;扩散;FIA;流量分析;流量注入分析;气体;注射;分离;试验
【英文主题词】:amperometry;aquaticfreecyanide;diffusablecyanide,flowinjectionanalysis;freecyanide;gasdiffusionseparation
【摘要】:Cyanideandhydrogencyanidearehighlytoxic.Regulationshavebeenestablishedtorequirethemonitoringofcyanideinindustrialanddomesticwastesandsurfacewaters.3ItisusefultodeterminetheaquaticfreecyanidetoestablishanindexoftoxicitywhenawastewaterisintroducedtothepHandtemperatureofthenaturalenvironment.Thistestmethodisapplicablefornaturalwater,salinewaters,andwastewatereffluent.1.1Thistestmethodisusedtoestablishtheconcentrationofaquatic"free"cyanideinanaqueouswastewateroreffluent.Thetestconditionsofthismethodareusedtomeasurefreecyanide(HCNandCN-)andcyanideboundinthemetal-cyanidecomplexesthatareeasilydissociatedintofreecyanideionsatthepHoftheaquaticenvironmentrangingfrompH6topH8.TheextentofHCNformationislessdependentontemperaturethanthepH;however,thetemperaturecanberegulatedifdeemednecessarytofurthersimulatetheactualaquaticenvironment.1.2TheaquaticfreecyanidemethodisbasedonthesameinstrumentationandtechnologythatisdescribedinstandardtestmethodD6888,butemploysmilderconditions(pH6-8bufferversusHClinthereagentstream),anddoesnotutilizeliganddisplacementreagents.1.3TheaquaticfreecyanidemeasuredbythisprocedureshouldbesimilartoactuallevelsofHCNintheoriginalaquaticenvironment.Thisinturnmaygiveareliableindexoftoxicitytoaquaticorganisms.1.4Thisprocedureisapplicableoverarangeofapproximately2to500g/L(partsperbillion)aquaticfreecyanide.Sampledilutionmayincreasecyaniderecoveriesdependingonthecyanidespeciation;therefore,itisnotrecommendedtodilutesamples.Higherconcentrationscanbeanalyzedbyincreasingtherangeofcalibrationstandardsorwithalowerinjectionvolume.InaccordancewithGuideE1763andPracticeD6512thelowerscopelimitwasdeterminedtobe9g/Lforchlorinatedgoldleachingbarreneffluentwater.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardstatementsaregiveninSectionandSection.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:8P.;A4
【正文语种】: