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HARDNESS, Total (mg/l as CaC03) Method 130.2 (Titrimetric, EDTA) STORET NO. 00900 1 Scope and Apphcatlon 11 This method IS apphcable to dnnlang, surface, and sahne waters, domestic and mdustnal wastes 12 The method IS sUltable for all concentratIOn ranges of hardness, however, m order to avoid large titratIOn volumes, use a sample ahquot contammg not more than 25 mg CaC03 13 Automated titratIOn may be used 2 Summary ofMethod 21 CalclUm and magneslUm Ions m the sample are sequestered upon the addition of dlsodlUm ethylenedlamme tetraacetate (Na2EDTA) The end pomt of the reactIOn IS detected by means of Enochrome Black T mdlcator, which has a red color m the presence ofcalclUm and magneslUm and a blue color when the catIOns are sequestered 3 Sample Handhng and Preservation 31 Coolto4°C,HN03topH<2 4 Comments 4 1 Excessive amounts of heavy metals can mterfere ThiS IS usually overcome by complexmg the metals With cyamde 4 1 1 Routme addition of sodlUm cyamde solution (CautIOn deadly pOlson) to prevent potential metalhc mterference IS recommended 5 Apparatus 5 1 Standard laboratory tItnmetnc eqUlpment 6 Reagents 6.1 Buffer solution 6 1 1 If ma$fieslUm EDTA IS avallable Dissolve, 169 g NH4Cl m 143 ml conc NH40H m a 250 ml volumetnc, add 1 25 g ofmagneslUm salt ofEDTA and dllute to the mark With dlst1lled water Then go to 6 1 3 IfmagneslUm EDT A IS unavallable Dissolve 1179 g dlsodlUm EDT A (analytIc~1 reagent grade) and 780 mg MgS04-7H20 (or 644 mg MgCI2-6H20) m 50 ml dlstllied water Add thiS solutIOn to a 250 m1 volumetnc flask contammg 16 9 g NH4Cl and 143 ml conc NH40H With mlxmg and dllute to the mark With distilled water 6 1 2 6 1 3 Store m a tightly stoppered plastiC botHe, stable for approxlIDately one month DispenseWithbulboperatedpipet Discardwhen1or2mladdedtosamplefallsto produceapHof100 ±O1atendpomtoftitratIOn Approved for NPDES Issued 1971 EditOrIal reVISIOn 1978 and 1982 1302-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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