【英文标准名称】:StandardTestMethodforResidualChlorineinWater
【原文标准名称】:水中残余氯的标准试验方法
【标准号】:ASTMD1253-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D19.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:amperometric;analysis;chlorine;water;Chlorinecontent--water;Inorganicchemicalanalysis--water;Inorganiccompounds--water;Residualchlorine
【摘要】:Chlorineisusedtodestroyordeactivateavarietyofunwantedchemicalsandmicroorganismsinwaterandwastewater.Anuncontrolledexcessofchlorineinwater,whetherfreeavailableorcombined,canadverselyaffectthesubsequentuseofthewater.1.1Thistestmethodcoversthedeterminationofresidualchlorineinwaterbydirectamperometrictitration.1.2WithintheconstraintsspecifiedinSection6,thistestmethodisnotsubjecttocommonlyencounteredinterferencesandisapplicabletomostwaters.Somewaters,however,canexertaniodinedemand,usuallybecauseoforganicmaterial,makinglessiodineavailableformeasurementbythistestmethod.Thus,itispossibletoobtainfalselylowchlorinereadings,eventhoughthetestmethodisworkingproperly,withouttheuser''sknowledge.1.3Precisiondataforthistestmethodwereobtainedonestuary,inlandmainstemriver,freshlake,openocean,andfreshcoolingtowerblowdownwater.Biasdatacouldnotbedeterminedbecauseoftheinstabilityofsolutionsofchlorineinwater.Itistheuser''sresponsibilitytoensurethevalidityofthetestmethodforuntestedtypesofwater.1.4Inthetestingbywhichthisstandardwasvalidated,thedirectandbackstarch-iodidetitrationsandtheamperometricbacktitration,formerlypartofthisstandard,werefoundtobeunworkableandwerediscontinuedin1986.HistoricalinformationispresentedinAppendixX1.Note18212;Orthotolidinetestmethodshavebeenomittedbecauseofpoorprecisionandaccuracy.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:5P.;A4
【正文语种】:英语