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6 9 6 10 6 8 I StandardIze the approxImately 002 N aCId agamst 00200 N Na2C03 solutIOn ThIslastsolutIOnISpreparedbydissolvmgI060ganhydrousNa2C03, oven-dned at 140°C, and dilutmg to 1000 ml wIth CO2-free dIstl1led water SodIUm hydroxIde, I N DIssolve 40 g NaOH m ammoma-free water and dl1ute to I hter Dechlonnatmg reagents A number of dechlormatmg reagents may be used to remove resIdualchlonnepnortodIstIllatIOn Thesemclude a SodIUm thIosulfate (1/70 N) DIssolve 35 g Na2S20 3-5H20 m dIstl1led water and dl1ute to I hter One ml of thIS solutIOn wIll remove I mg/I of resIdual chlorme m 500mlofsample b SodIUm arsemte (1/70 N) DIssolve 109 NaAs02 m dIstl1led water and dl1ute to I hter 7 Procedure 7I PreparatIon of eqmpment Add 500 ml of dIstIlled water to an 800 ml KJeldahl flask The addItion of bOllmg ChIpS WhICh have been prevIOusly treated wIth dl1ute NaOH wIll prevent bumpmg Steam out the dIstIllatIOn apparatus untl1 the dIstIllate shows no trace of ammoma wIth Nessler reagent 72 Sample preparatIOn Remove the resIdual chlonne m the sample by addmg dechlormatmg agent eqmvalent to the chlonne resIdual To 400 ml of sample add I N NaOH (6 9), until the pH is 95, checkmg the pH durmg addItIOn wIth a pH meter or by use of a short range pH paper 73 Distl1latIOn Transfer the sample, the pH of which has been adjusted to 9 5, to an 800 ml KJeldahlflaskandadd25mloftheboratebuffer(67) DIStill300mlattherateof6-10 mllmm mto 50 ml of2% bonc aCid (64) contamed m a 500 ml Erlenmeyer flask NOTE 5: The condenser tip or an extensIOn of the condenser tiP must extend below the level ofthe bonc aCId solutIOn Dilute the distl1late to 500 ml with distilled water and nesslenze an ahquot to obtam an approximate value of the ammoma-mtrogen concentratIOn For concentratIOns above I mg/I the ammoma should be determmed tItnmetncally For concentrations below thIS value it is determmed colonmetncally The electrode method may also be used 74 DetermmatIOnofammomamdistillate Determmetheammomacontentofthedistl1late tItnmetncally, colonmetncally or potentIOmetncally as descnbed below 7 4 I TItnmetnc determmatIOn Add 3 drops of the mixed mdicator to the distl1late and titratetheammomawiththe002NH2S04, matchmgtheendpomtagamstablank contammg the same volume ofdistl1led water and H3B03 SOI)ltIOn 3502-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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