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drop by drop unttl the color disappears Run m duplIcate DuplIcate determmattons shouldagreewlthm ±O05ml mlPAO x 00375 20 Adjust lodme solution If necessary and recheck 5 12 StandardIzatIon of0 0282N Iodme solutIOn Dissolve approxImately 2 g (±1 g) KI m 100 to 150 ml dIstIlled water, add 20 ml Iodme solutIOn (5 4) Dtlute to 300 ml and tItrate wIth 0 0375N phenylarsme oXIde solutIon (5 10) to a pale straw color Add a small scoop ofmdlcator (57) Walt unttl homogenous blue color develops and contmue the tItratIOn drop by drop untIl the color disappears Run m duplIcate DuplIcate determmattons shouldagreewlthm ±O05ml _m1PAOx00375 N12 - 20 Adjust Iodme solutIon Ifnecessary and recheck 6 Procedure 6 1 Starch-IodIde End Pomt 6 1 1 6 1 2 6 1 3 6 1 4 6 2 thatperSIstsaftermlxmg Recordthemloftitrantused Amperometnc End Pomt Place 5 00 ml of0 00564N P AO solutIOn (5 9) m a flask Add approxImately 19 KI on a scoop Add 4 ml acetate buffer solutIOn (5 2) Add 200 ml of sample For concentratIons above 10 mg/1, a sample ofless volume may be dIluted to 200 ml wth chlonne-free, chlonne demand-free distIlled water MIXwell 615 6 1 6 6 1 7 TItrate wIth 0 0282N IOdme solutIon (5 12) to the first appearance of a blue color 62 1 6 2 2 6 2 3 Perform steps 6 1 1-6 1 5 mcluslve or follow the dIrectIons of the manufacturer of the amperometnc tltrator Prepackaged reagents should be checked (restandardized) Place the SolutIon m the proper posItIOn on the amperometnc tttrater Titrate with 0 0282N Iodme SolutIOn (5 12) Observe the response of the meter needle Imtlally the needle wIll remaIn statIOnary As the endpomt IS approached the needle wIll temporanly deflect, then return to or near to ItS ongmal posItIon Contmue dropwlse When the needle deflects and remams deflected the end pomt has been exceeded by one drop Subtract 1I20th of an ml from the buret readmg and record the result Add approxImately 4 mg mdlcator (5 7)Just before tttratton 3302-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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