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9 CalculatiOn 9 I If the tltnmetric procedure IS used, calculate Total KJeldahl NItrogen, III mg/I, III the onglllal sample as follows (A- B)NxFx1,000 TKN, mg/l = S where A = mIllIlIters ofstandard 0 020 N H2S04solutiOn used III tltratlllg sample B= mIllIlItersofstandard0020NH2S04solutiOnusedIIItitratmgblank N = normalIty ofsulfunc aCId solutiOn F = mIllIeqUIvalent weIght ofmtrogen (14 mg) S = mIllIlIters ofsample dIgested If the sulfunc aCId IS exactly 0 02 N the formula IS shortened to _(A- B)x280 TKN,mgII - S If the Nessler procedure IS used, calculate the Total KJeldahl NItrogen, m mg/l, III the onglllal sample as follows TKN, mg/l = A xri'OOO x ~ where A = mg NH3-N read from curve B = mltotaldIstIllatecollectedlllcludlllgtheH3B03 C= mldIstIllatetakenforNesslenzatiOn D = ml of onglllal sample taken Calculate Orgamc K]eldahl NItrogen III mg/I, as follows Orgamc KJeldahl NItrogen = TKN -(NH3-N ) 92 9 3 and compared to similar values on the curve to lllsure that the dIgestIon-distIllatiOn techmqueISrelIable IftreatedstandardsdonotagreewIthuntreatedstandardsthe operator should find the cause of the apparent error before proceedlllg 3513-5PDF Image | Methods for Chemical Analysis of Water and Wastes
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