美国CHEMetricsK-4502型总硬度滴定测试盒用于测试水中总硬度含量。例如：锅炉水。规格参数：产品类型Hardness(total)—Titrets®TitrationCells产品型号K-4502测试范围2-20ppm以CaCO3计测试目盛2.0,2.2,2.4,2.6,2.8,3.0,3.2,3.6,4.0,5.0,6.0,7.0,8.0,10,14,20ppm检测下限2.0ppm测试方法EGTA（总）测试次数30次/盒标准配置30支安瓿瓶组件、1个Titrettor™工具、1个25mL样品杯、1份说明书产品价格咨询上海益朗仪器有限公司Titrets®是美国CHEMetrics的专利（专利号：4,332,769）。美国CHEMetrics硬度测试盒VisualKits测试范围MDL测试方法测试盒货号50-500ppm以CaCO3计50ppmEGTA（钙）K-17052-20ppm以CaCO3计2.0ppmEGTA（总）K-450220-200ppm以CaCO3计20ppmEGTA（总）K-4520100-1000ppm以CaCO3计100ppmEGTA（总）K-4585MethodsHardnessisameasureofthemineralcontentofwater.Calciumandmagnesiumarethemostcommonmineralsthatcontributetohardness.Hardwatercausesscalinginboilersandotherindustrialequipment,anddiminishestheeffectivenessofsoapsanddetergents.TheEGTAMethod(calcium)Reference:West,T.S.,DSC,Ph.D.,ComplexometrywithEDTAandRelatedReagents,3rd.ed.,pp.46,164(1969).TheEGTAmethodisspecificforcalciumhardness.TheEGTAtitrantinalkalinesolutionisemployedwithazinconindicator.Resultsareexpressedasppm(mg/L)CaCO3.Shelf-life:eightmonths.Althoughthereagentitselfisstable,theendpointindicatorhasalimitedshelf-life.Werecommendstockingquantitiesthatwillbeusedwithinsevenmonths.TheEDTAMethod(total)References:APHAStandardMethods,23rded.,Method2340C-1997.USEPAMethodsforChemicalAnalysisofWaterandWastes,Method130.2(1983).Thetotalhardnessmethodisapplicabletodrinking,surface,boiler,andbrinewaters.TheEDTAtitrantisemployedinalkalinesolutionwithacalmagiteindicator.Thismethoddeterminesthecombinedcalciumandmagnesiumconcentrationofasample.Ifnomagnesiumispresent,theendpointofthetitrationnormallyappearssluggish.Resultsareexpressedasppm(mg/L)CaCO3.)