【英文标准名称】:StandardTestMethodforFreeCyanidewithFlowInjectionAnalysis(FIA)UtilizingGasDiffusionSeparationandAmperometricDetection
【原文标准名称】:用气体扩散分离和电流计探测法对游离氰化物进行流量注入分析(FIA)的标准试验方法
【标准号】:ASTMD7237-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:
【英文主题词】:amperometry;aquaticfreecyanide;diffusiblecyanide,flowinjectionanalysis;freecyanide;gasdiffusionseparation;Amperometricdetection;Cyanides;Flowinjectionanalysis(FIA);Gasdiffusion
【摘要】:Cyanideandhydrogencyanidearehighlytoxic.Regulationshavebeenestablishedtorequirethemonitoringofcyanideinindustrialanddomesticwastesandsurfacewaters.ItisusefultodeterminetheaquaticfreecyanidetoestablishanindexoftoxicitywhenawastewaterisintroducedintothenaturalenvironmentatagivenpHandtemperature.Thistestmethodisapplicablefornaturalwater,salinewaters,andwastewatereffluent.1.1Thistestmethodisusedtoestablishtheconcentrationoffreecyanideinanaqueouswastewateroreffluent.Thetestconditionsofthismethodareusedtomeasurefreecyanide(HCNandCN-)andcyanideboundinthemetal-cyanidecomplexesthatareeasilydissociatedintofreecyanideionsatthepHof6.FreecyanideisdeterminedatpH6atroomtemperature.TheaquaticfreecyanidecanbedeterminedbymatchingthepHtothewaterinthereceivingenvironmentintherangeofpH6to8.TheextentofHCNformationislessdependentontemperaturethanthepH;however,thetemperaturecanberegulatedifdeemednecessaryforaquaticfreecyanidetofurthersimulatetheactualaquaticenvironment.1.2ThefreecyanidemethodisbasedonthesameinstrumentationandtechnologythatisdescribedinstandardtestmethodD6888,butemploysmilderconditions(pH6-8bufferversusHClorH2SO4inthereagentstream),anddoesnotutilizeliganddisplacementreagents.1.3TheaquaticfreecyanidemeasuredbythisprocedureshouldbesimilartoactuallevelsofHCNintheoriginalaquaticenvironment.Thisinturnmaygiveareliableindexoftoxicitytoaquaticorganisms.1.4Thisprocedureisapplicableoverarangeofapproximately2to500x03BC;g/L(partsperbillion)freecyanide.Sampledilutionmayincreasecyaniderecoveriesdependingonthecyanidespeciation;therefore,itisnotrecommendedtodilutesamples.Higherconcentrationscanbeanalyzedbyincreasingtherangeofcalibrationstandardsorwithalowerinjectionvolume.InaccordancewithGuideE1763andPracticeD6512thelowerscopelimitwasdeterminedtobe9x03BC;g/Lforchlorinatedgoldleachingbarreneffluentwater.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Specifichazardstatementsaregivenin8.6andSection9.
【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】:英语