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NITROGEN, AMMONIA Method 350.3 (Potentiometric, Ion Selective Electrode) STORET NO. Total 00610 Dissolved 00608 1 Scope and ApphcatIOn 1 I ThIS method IS apphcable to the measurement of ammoma-mtrogen m dnnkmg, surface and sahne waters, domestIc and mdustnal wastes I 2 ThIS method covers the range from 0 03 to 1400 mg NH3-N /I Color and turbIdIty have ItO effect on the measurements, thus, dIstIllatIOn may not be necessary 2 Summary of Method 2I The ammoma IS determmed potentIOmetncally usmg an Ion selectIve ammoma electrode and a pH meter havmg an expanded mIlhvolt scale or a specIfic Ion meter 22 The ammoma electrode uses a hydrophobIc gas-permeable membrane to separate the sample solutIOn from an ammomum chlonde mternal solutIOn AmmonIa m the sample dIffuses through the membrane and alters the pH ofthe mternal solutIOn, whIch IS sensed by a pH electrode The constant level of chlonde m the mternal solution IS sensed by a chlonde selectIve IOn electrode whIch acts as the reference electrode 3 Sample Handhng and PreservatIOn 3 I Samples may be preserved WIth 2 m1 ofconc H2S04 per hter and stored at 4°C 4 Interferences 4I VolatIle ammes act as a pOSItive mterference 42 Mercury mterferes by formmg a strong complex WIth ammoma Thus the samples cannot be preserved WIth mercunc chlonde 5 Apparatus 5I Electrometer (pH meter) WIth expanded mV scale or a specIfic Ion meter 52 AmmOnIa selective electrode, such as Onon Model 95-10 or ElL Model 8002-2 53 MagnetIc htIrrer, thermally msulated, and Teflon-coated stlrnng bar 6 Reagents 61 DIstIlled water SpeCIal precautIOns must be taken to msure that the dIstIlled water IS free of ammOnIa ThIS IS accomphshed by passmg dIstIlled water through an IOn exchange column contammg a strongly aCIdIC catIon exchange resm mIxed WIth a strongly baSIC anIon exchange resm 62 SodIUm hydrOXIde, ION DIssolve 400 g ofsodIUm hydroXIde m 800 ml ofdIstIlled water Cool and dIlute to 1 hter WIth dIstIlled water (6 I) 63 AmmOnIum chlonde, stock solutIOn 10 ml = 10 mg NH3-N DIssolve 3819 g NH4CI m water and bnng to volume m a I hter volumetnc flask usmg dIstIlled water (6 I) Issued 1974 Approved for NPDES followmg prehmmary chsullatlOn (Method 350 2) 3503-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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