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Adjust lodme solutlOn If necessary and recheck 515 StandardlzatlOn of 0 0282N lOdme solutlOn DIssolve approXImately 2 g (±1 g) KI (5 2) m 100 to 150 ml dIstIlled water, add 20 mllodme solutlOn (5 10) Dtlute to 300 ml and tItrate wIth 0 0375 N phenylarsme oXIde solutIOn (54) to a pale straw color Add a small scoop of mdlcator (55) Walt unttl homogeneous blue color develops and contmue the tltratlOn drop by drop unttl the color dIsappears Run m duphcate Duphcate determmatIonsshouldagreewlthm ±O05ml -,..T _ rolPAa x 00375 J.,~I2 - 20 Adjust lodme solutIon If necessary and recheck 6 Procedure 61 62 63 64 65 66 67 , ThIS procedure gIVes a convement dIrect readmg (ml titrant = the mlcroburet (0 5 ml to 2,5 or 10 ml) The sample volume and reagent normahtles may be vaned at the analyst's dlscretlOn Place 5 ml acetIc aCId m an Erlenmeyer flask contammg a Teflon coated magnetIc stlrrmgbar Add about 1g KI (5 2) estImated on a spatula Add 200 ml sample Place on magnetIc stIrrer under buret TItrate away from dIrect sunhght WIth 0 00564N P AO (53) to a pale straw color Add a scoop of mdlcator (55) Walt untIl blue color IS homogeneously dlstnbuted, contmue tltratmg unttl blue color IS dIscharged The ml of PAO IS equal to the mg/l CI plus or mmus the blank correctlOn (6 7) If any Blank tItratlOn Usmg dlstl1led water m place of the sample perform steps 6 2-6 5, add a scoop ofmdlcator Perform eIther 6 7 1or 6 7 2 dependmg on color development 6 7 1 Blank tItratlOn A If a blue color develops tItrate WIth 0 00564N P AO (5 3) to the dIsappearance of the blue color and record the results 6 7 2 Blank tItratlOn B I f no blue color develops titrate WIth 0 0282N lOdme (5 10) untl1 blue color appears Back tItrate WIth 000564N PAO (53) and record the dIfference as titratIon B 7 CalculatlOns 71 The ml of PAO tItrant IS equal to mg/l Cl under the volumes and 'concentratlOns descnbed The blank correctlOn A (67 1) can be dIrectly subtracted The blank correctlOn B (672), WhICh IS added, mvolves a factor of 5 (unless one substitutes o00564NlOdmeforthe00282NlOdme) Normallythereagentsarepureenoughthatthe blank correctlOn IS mSlgmficant and therefore unnecessary 3303-3 mg/l CI) m the range ofPDF Image | Methods for Chemical Analysis of Water and Wastes
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