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6. 5 6 ' Standard PotasslUm Permanganate SolutlOn Dllute 10 00 ml of stock potassiUm permanganate splutlOn (55) to 100 ml wIth dIstIlled water In a volumetnc flask One mIllthter ofthIS solutlOn dIluted to 100 ml wIth dIstIlled water IS eqUIvalent to 1 00 mg/l CI Procedure 7. 6 2 6 Read at 515 nm on a spectrophotometer, and record the absorbance CalculatIons 8 PrecIsIon and Accuracy Twenty-five laboratones analyzed prepared samples of 0 66 mg/l CI The relatIve standard devIation was 27 6% and the relatIve error was 15 6% 6 1 Cahbration 6 1 1 Prepare a senes of permanganate standards coverIng the chlonne eqUIvalent range of0 05 to 4 mg/l 6 1 2 Place 5 m1 phosphate buffer (5 1) In a flask 613 Add5mlDPDreagent(52) 6 1 4 Add 100 ml permanganate standard (6 1 1) 6 1 5 Read at 515 nm on a spectrophotometer and record the absorbance 6 1 6 Return the contents of the cell to the flask 6 1 7 TItrate the contents of the flask wIth standard ferrous ammOnIum sulfate (DPD- FASMethod),untIltheredcolorISdIscharged Recordtheresult Sample AnalysIs 62 1 Place0 5mlphosphatebuffer(5 1)Inflask 622 Add05mlDPDreagent(52) 6 2 3 Add approXImately 0 1g KI (5 4) 624 Add10mlofsample 6 2 5 Let stand 2 mInutes 6 2 7.1 7.2 CahbratlOn Curve Method 7 1 1 7 1 2 7 1 3 7 1 4 Plot the absorbance of the standard permanganate solutlOns (6 1 5) on the vertIcal aXIS versus the tItrated concentration (6 1 7) on the honzontal aXIS Draw the hne ofbest fit through the POInts Locate the absorbance (6 2 6) ofthe sample on the vertIcal aXIS Read the concentratIon on the honzontal aXIS at the Intersect of the absorbance and the cahbratlOn hne RegresslOn AnalysIs CalculatlOn-Computenzed 72 1 Enter the absorbance data of the standard permanganate solutlOns (6 1 5) and the respect~vetItrated concentratlOns (6 1 7) In the appropnate places In the program 7 2 2 Enter the absorbance data ofthe sample 7 2 3 The computer wIll then dIsplay the concentratlOn In mg/l CI 3305-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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