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1 1 12 Th1s method covers the determmatlOn of total KJeldahl mtrogen m dnnkmg, surface and sahne waters, domest1c and mdustnal wastes The procedure converts mtrogen components of blOloglCal ongm such as ammo aC1ds, protems and pepttdes to ammoma, but may not convert the mtrogenous compounds of some mdustnal wastes such as ammes, mtro compounds, hydrazones, OX1mes, sem1carbazones and some refractory tert1ary ammes Three alternattves are ltsted for the determmatlOn of ammoma after d1stl1latlOn the titnmetnc method wh1ch 1S appltcable to concentratIOns above 1 mg N/ltter, the NesslenzatlOn method whlCh 1S appltcable to concentratIOns below 1 mg Nll1ter, and the potentlOmetnc method appltcable to the range 005 to 1400 mg/1 Th1s method 1S descnbed for macro and mlCro glassware systems 13 2 DefimtlOns 2 1 22 Total KJeldahl mtrogen 1S defined as the sum of free-ammoma and orgamc mtrogen compounds wh1ch are converted to ammomum sulfate (NH4)2S04, under the cond1tions of d1gestlOn descnbed below Orgamc KJeldahl mtrogen 1S defined as the d1fference obtamed by subtractmg the free- ammoma value (Method 3502, N1trogen, Ammoma, th1s manual) from the total KJeldahl mtrogen value Th1s may be determmed d1rectly by removal of ammoma before d1gestlOn NITROGEN, KJELDAHL, TOTAL Method 351.3 (Colorimetric; Titrimetric; Potentiometric) 1 Scope and AppltcatlOn 3 Summary of Method 31 The sample 1S heated m the presence of cone sulfunc aC1d, K2S04 and HgS04 and evaporated untl1 S03 fumes are obtamed and the solutIOn becomes colorless or pale yellow Theres1due1Scooled,dl1uted,and1Streatedandmadealkahnew1thahydrox1de- thIOsulfate solutIOn The ammoma 1S d1stl1led and determmed after d1stl1lat10n by NesslenzatlOn, titratIOn or potentlOmetry 4 Sample Handhng and PreservatlOn 4 1 Samplesmaybepreservedbyadd1tionof2mlofconc H2S04perhterandstoredat4°C Even when preserved m th1s manner, converS10n of orgamc mtrogen to ammoma may occur Preserved samples should be analyzed as soon as poss1ble 5 Interference 5 1 H1gh mtrate concentratIOns (lOX or more than the TKN level) result In low TKN values The reactIOn between mtrate and ammoma can be prevented by the use of an amon exchange resm (chlonde form) to remove the mtrate pnor to the TKN analys1s Approved for NPDES Issued 1971 Ed1tonal reV1SlOn 1974 and 1978 3513-1 STORET NO. 00625PDF Image | Methods for Chemical Analysis of Water and Wastes
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