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6 3 6 2 2 If the alkahmty IS > 300 mg/1 CaC03 and cannot be reduced by dIlutIon because of low calcIUm concentratIOn, the alkahmty must be decreased by aCIdIfyIng, boIlIng one mInute and coohng TItratIOn 63 1 Add 2 0 ml NaOH solutIOn (5 1), or a volume suffiCIent to produce pH 12 to 13, to 7 CalculatIons 7 1 7 2 Total calcIUm mg/1 Ca = A x N x 20,040 ml of sample 632 6 3 3 50mlofsample StIr Add 01 to 0 2 g IndIcator (5 2 ~ or 523) or 1-2 drops IfIndlCator SolutIon IS used ImmedIately tItrate WIth contInuous stIrnng Check to see that no further color change occurs when USIng murexIde (5 2 2) by addIng 1 to 2 more drops of tItrant after recordIng mIlhhters oftItrant at firstJudged end POInt where A = ml tItrant N = NormahtyofEDT AsolutIOn CalcIUm hardness mg/1 CaC03 = A x N x 50,000 ml of sample whereAandNarethesameasIn 7I 8 PreCIsIOn and Accuracy 81 A synthetIc unknown sample contaInIng 108 mg/1 Ca, 82 mg/1 Mg, 3 1 mg/1 K, 199 mg/1 Na, 241 mg/1 chlonde, 1 1 mg/1 mtrate N, 250 ug/1 mtnte N, 259 mg/1 sulfate, and 42 5 mg/1 total alkahmty In dIstIlled water was determIned by thIS method wIth a relatIve standard devIatIon of9 2% and a relatIve error of l' 9% In 44laboratones Bibliography 1 Standard Methods for the ExamInatIon of Water and Wastewater, 14th EdItIOn, p 189, Method 306C (1975) 2 Annual Book of ASTM Standards, Part 31, "Water", Standard D511-76, Method B, p 253 (1976) 2152-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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