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8 CalculatIOn USIng semiloganthmic graph paper, plot the concentratlOn of ammoma In mg NHrN on the logaXiSvs theelectrodepotentialdevelopedInthestandardonthelInearaXIS,startIngWIththe lowest concentration at the bottom of the scale mgTKN/1 = (A - Bbx 1,000 where A = mg NH3-N read from standard curve B = mg NH3-N In blank C = ml of ongInal sample taken Precision and Accuracy 9 1 PreCISlOn and accuracy data are not available at this time BIblIography Schlueter, A, "Nitrate Interference In Total KJeldahl Nitrogen DetermInatlOns and itS Removal by Amon Exchange ResIn", EPA-600/7-77-Q17 9 1 7 4 7 3 4 After the temperature of the block has reached 380°C, the time should be set for 30 mInutes Longer tIme and hIgher temperature may result In complete loss of the aCId 735 Cool,add25mlofammoma-freewaterandmIX Electrode analysIs 7 4 1 7 4 2 7 4 3 7 4 4 All standards should be treated as the samples and should contaIn the same concentratIOn ofsulfunc aCId-mercunc sulfate-potassIUm sulfate solutlOn (6 3) Macro Kjeldahl system - To a 100 ml alIquot, add 15 ml of 10 N NaOH (64), mIX and cool to room temperature Immerse the electrode In the sample solutlOn and add 4 ml of NaOH- NaI-EDTAreagent(65)whilemIXIng AllowtheelectrodetoremaInimmersedIn the solutlOn until a stable readIng IS obtaIned Micro KJeldahl system Add 6 ml of 10 N NaOH solutIOn (6 4), cool to room temperature and transfer the sample to a 100 ml beaker Immerse the electrode In the sample solutlOn and add 4 mlofNaOH-NaI-EDTAreagent(65)whIlemIXIng AllowtheelectrodetoremaIn Immersed In the solutIOn untIl a stable readIng is obtaIned Block Digestor Add 3 mlof 10 N NaOH (64), cool to room temperature, dIlute to 50 ml and transfer to a 100 ml beaker Immerse the electrode In the sample and add 2 ml of NaOH-NaI-EDTA reagent (65) while mIXIng Allow the electrode to remaIn Immersed In the solutlOn until a stable readIng is obtaIned 3514-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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