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NITROGEN, KJELDAHL, TOTAL Method 351.2 (Colorimetric, Semi-Automated Block Digester, AAII) STORET NO. 00625 1 Scope and ApplIcatlOn 11 Thts method covers the determmatlOn ofto1..al Kjeldahl mtrogen m dnnkmg and surface waters, domestIc and mdustnal wastes The procedure converts mtrogen components of bIologIcal ongIn such as ammo aCIds, protems and peptides to ammoma, but may not convert the mtrogeneous compounds of some mdustnal wastes such as ammes, mtro compounds, hydrazones, OXImes, semicarbazones and some refractory tertIary ammes The applIcable range of thIS method IS 01 to 20 mg/l TKN The range may be extended WIth sample dilutlOn 2 Summary of Method 21 The sample IS heated m the presence ofsulfunc aCId, K2S04and HgS04for two and one half hours The reSIdue IS cooled, dIluted to 25 ml and placed on the AutoAnalyzer for ammoma determmation ThIS dIgested sample may also be used for phosphorus determmatlOn 3 DefimtlOns 3 1 32 Total Kjeldahl mtrogen IS defined as the sum of free-ammoma and orgamc mtrogen compounds WhICh are converted to ammomum sulfate (NH4)2S04, under the condItIons o f digestlOn deSCrIbed below Orgamc Kjeldahl mtrogen IS defined as the dIfference obtamed by subtractmg the free- ammoma value (Method 3502, NItrogen, Ammoma, thIS manual) from the total Kjeldahl mtrogen value 4 Sample HandlIng and PreservatlOn 4 1 Samples may be preserved by addItIon of 2 ml of conc H2S04per lIter and stored at 4°C Even when preserved m thIS manner, converSIon of orgamc mtrogen to ammoma may occur Therefore, samples should be analyzed as soon as pOSSIble 5 Apparatus 5 1 5 2 53 Block Digestor-40 Techmcon Mamfold for Ammoma (FIgure 1) Chemware TFE (Teflon bOllmg stones), Markson SCIence, Inc, Box 767, Delmar, CA 92014) 6 Reagents 6 1 MerCUrIC Sulfate DIssolve 8 g red merCUrIC OXIde (HgO) m 50 ml of 1 4 sulfUrIC aCId (10 m l c o n c H 2S 0 4 4 0 m l d I s t I l l e d w a t e r ) a n d d I l u t e t o 1 0 0 m l W I t h d I s t I l l e d w a t e r 6 2 DigestlOn SolutlOn (SulfUrIC aCId-merCUrIc sulfate-potaSSIUm sulfate solutlOn) DIssolve 133 g of K2S04 m 700 ml of dIstIlled water and 200 ml of conc H2S04 Add 25 ml of merCUrIC sulfate solutlOn and dIlute to 1 lIter Pendmg approval for NPDES Issued 1978 3512-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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