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10. 94 PotentlOmetnc determmatlOn Calculate Total KJeldahl NItrogen, m mg/1, m the ongmal sample as follows B TKN, mg/l = D x A where A = mg NH3-N/1 from electrode method standard curve B = volume ofdl1uted d1stlllate m ml D = ml ofongmal sample taken PrecisIon 10 1 Thtrty-one analysts m twenty laboratones analyzed natural water samples contalmng exact mcrements of orgamc mtrogen, wIth the followmg results Increment as NItrogen, KJeldahl mg N/hter 020 031 410 461 PreCISion as Standard DevIatIOn mg N/hter 0197 0247 1056 1191 Bias, % +1554 + 545 + 103 - 167 Accuracy as fig N/hter +003 +002 +004 -008 (FWPCA Method Study 2, Nutnent Analyses) BIbliography 1. Standard Methods for the ExammatlOn of Water and Wastewater, 14th EdItion, p 437, Method 421 (1975) 2. Schlueter, Albert, "Nitrate Interference In Total KJeldahl NItrogen DetermmatlOns and Its Removal by Amon Exchange Resms", EP A Report 600/7-77-017 "' 3513-6 Bias,PDF Image | Methods for Chemical Analysis of Water and Wastes
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