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HARDNESS, Total (mg/l as CaC03) Method 130.1 (Colorimetric, Automated EDTA) STORET NO. 00900 1 Scope and Apphcatton 1 1 ThIS automated method IS appltcable to dnnkIng, surface, and saltne waters The apphcable range IS 10 to 400 mg/l as CaC03 ApproxImately 12 samples per hour can be analyzed 2 Summary of Method 21 The magnesIUm EDTA exchanges magnesIum on an eqUIvalent baSIS for any calCIum and/or other catIons to form a more stable EDTA chelate than magneSIUm rrhe free magneSIUm reacts With calmagtte at a pH of 10 to gtve a red-Violet complex Thus, by measunng only magneSIUm concentration In the final reaction stream, an accurate measurementoftotalhardnessISpOSSible 3 Sample HandlIng and PreservatIOn 31 Coolto4°C,HN03topH<2 4 Interferences 4 1 No Significant Interferences 5 Apparatus 5 1 Techmcon AutoAnalyzer consistIng of 5 1 1 Sampler I 5 1 2 ContInuous Fl1ter 513 Mamfold 5 1 4 ProportIOnIng Pump 5 1 5 Colonmeter eqUIpped With 15 mm tubular flow cell and 520 nm filters 5 1 6 Recorder eqUIpped With range expander 6 Reagents 61 Buffer Dissolve 67 6 g NH4CI In 572 m1 of NH40H and dl1ute to 1 hter With distilled water 62 Calmaglte IndIcator Dissolve 025 g In 500 ml of dlstl1led water by strrnng approximately 30 mInutes on a magnetic strrrer Fl1ter 63 MonomagnesIUmethylenedlamIne-tetraacetate(MgEDTA) Dissolve0 2gofMgEDTA In 1hter ofdlstdled water 64 Stock Solutton Weigh 1 000 g of calCIUm carbonate (pre-dned at 105°e) Into 500 m1 Erlenmeyer flask, add 1 1 HCI untd all CaC03 has dissolved Add 200 ml of distilled water and bod for a few mInutes Cool, add a few drops of methyl red Indicator, and adjusttotheorangecolorWith3NNH40Handdduteto1000mlWithdistilledwater 10 m1 = 10mgCaC03 Approved for NPDES Issued 1971 • 130 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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