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NITROGEN, AMMONIA Method 350.2 (Colorimetric; Titrimetric; Potentiometric Distillation Procedure) 1 Scope and ApphcatlOn 1 1 12 13 ThIS dlstl1latlOn method covers the determmatlOn of ammonIa-nItrogen exclusIve of total Kjeldahl nItrogen, m drmkmg, surface and sahne waters, domestic and mdustnal wastes It IS the method of chOIce where economICS and sample load do not warrant the use of automated eqUIpment Themethodcoverstherangefromabout005to10mgNH3-N/lforthecolonmetnc procedure, from 10 to 25 mg/l for the tltnmetnc procedure, and from 005 to 1400 mg/l for the electrode method ThIS method IS descnbed for macro gla~sware,however, mIcro dlstl1latlOn eqUIpment may also be used 2 Summary of Method 21 The sample IS buffered at a pH of 9 5 wIth a borate buffer m order to decrease hydrolysIs of cyanates and organIC nItrogen compounds, and IS then dIstilled mto a solutlOn ofbonc aCId The ammOnIa m the dIstillate can be determmed colonmetncally by nesslenzatlOn, tItnmetncally wIth standard sulfunc aCId wIth the use of a mIXed mdlcator, or potentlOmetncally by the ammOnIa electrode The chOIce between the first two procedures depends on the concentratlOn ofthe ammOnIa 3 Sample Handlmg and PreservatlOn 3 1 Samples may be preserved wIth 2 ml ofconc H2S04 per hter and stored at 4°C 4 Interferences 41 A number of aromatIC and ahphatlc ammes, as well as other compounds, both orgamc and morganIc, WIll cause turbIdIty upon the addItion of Nes"ler reagent, so dIrect nesslenzatlOn (1 e , wIthout dlstl1latlOn), has been dIscarded as an offiCIal method 42 Cyanate, WhICh may be encountered m certam mdustnal effluents, WIll hydrolyze to some extent even at the pH of 9 5 at WhICh dlstl1latlOn IS carned out Volatl1e alkahne compounds, such as certam ketones, aldehydes, and alcohols, may cause an off-color upon nesslenzatlOn m the dlstlllatlOn method Some of these, such as formaldehyde, may be ehmmated by bOIhng off at a low pH (approxImately 2 to 3) pnor to dlstl1latlOn and nesslenzatlOn 43 ReSIdual chlonne must also be removed by pretreatment of the sample wIth sodmm thlOsulfate before dlstIllatlOn Approved for NPDES Issued 1971 Edltonal reVlSlOn 1974 3502-1 STORET NO. Total 00610 Dissolved 00608PDF Image | Methods for Chemical Analysis of Water and Wastes
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