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CALCIUM Method 215.2 (Titrimetric, EDTA) STORET NO. Calcium (mg/l CaC03) 00910 Calcium, Total (mg/l Ca) 00916 1 Scope and ApphcatlOn 1 1 ThIS method IS apphcable to dnnkmg and surface waters, domestIc and mdustnal wastes 1 2 The lower detectlOn hmlt of thIS method IS approxImately 05 mg/1 as CaC03, the upper hmlt can be extended to all concentratIons by sample dl1utlOn It IS recommended that a sample ahquot contammg not more than 25 mg CaC03 be used 2 Summary of Method 2 1 Calcmm lOn IS sequestered upon the addItion of dlsodmm dlhydrogen ethylenedlamme tetraacetate(EDTA) ThetltratlOnendpomtISdetectedbymeansofanmdlcatorwhich combmes wIth calcmm only 3 Interferences 3 1 Strontmm and banum mterfere and alkahmty m excess of 30 mg/1 may cause an mdlstmct end pomt Magnesmm mterference IS reduced or ehmmated by ralsmg the pH between 12-13 to precIpItate magnesmm hydroxIde 4 Apparatus 4 1 Routme laboratory tltnmetnc glassware 5 Reagents 5 1 5 2 Sodmmhydroxlde, NaOH, IN IndICators 5 2 1 Many mdlcators are aval1able, both laboratory prepared and commercIal, and may beused Twoaredescnbedhere 522 MurexIde (ammomum purpurate) mdICator ThIS changes from pmk to purple DIssolve 150 mg of the dye m 100 g absolute ethylene,glycol If a dry powder IS preferred mIX 200 mg murexIde WIth 100 g sohd NaCI and gnnd to 40 to 50 mesh Titrate ImmedIately after addmg mdlcator because It IS unstable under alkahne condltlOns 523 Enochrome Blue Black R (sodmm-1-(2-hydroxy-1-naphthylazo)-2-naphthol-4- sulfomc aCId) mdlcator This changes from red through purple to blmsh purple to a pure blue WIthout any trace of red or purple tmt The pH of some waters must be raIsed to 14 (rather than 12-13) by the use of 8 N NaOH m order to get a good color change Gnnd m a mortar 200 mg powdered dye and 100 g sohd NaCI to 40 to 50 mesh Store m tIghtly stoppered bottle Use 02 g ofthIS mIxture for tItratlOn Approved for NPDES Issued 1974 Edltonal reVlSlOn 1978 2152-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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