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NITROGEN, KJELDAHL, TOTAL Method 351.1 (Colorimetric, Automated Phenate) STORET NO. 00625 1 Scope and ApplicatIOn 1 1 ThIS automated method may be used to determIne Kjeldahl mtrogen In surface and saline waters The applicable range IS 0 05 to 2 0 mg N il ApprOXImately 20 samples per hour can be analyzed 2 Summary of Method 21 The sample IS automatIcally dIgested wIth a sulfunc aCId solutIon contaInIng potassIUm sulfate and mercunc sulfate as a catalyst to convert orgamc mtrogen to ammomum sulfate The solutIOn IS then automatIcally neutralized wIth sodIUm hydroxIde solutIOn and treated wIth alkaline phenol reagent and sodIUm hypochlonte reagent ThIs treatment forms a blue color deSignated as Indophenol SodIUm mtroprusslde, WhICh Increases the IntenSIty of the color, IS added to obtaIn necessary senSItIVIty for measurement oflow level mtrogen 3 Defimtlons 31 Total Kjeldahl mtrogen IS defined as the sum of free-ammoma and of orgamc mtrogen compounds whIch are converted to (NH4)2S04 under the condItIons of dIgestIon WhIch are speCIfied below 32 Orgamc Kjeldahl mtrogen IS defined as the dIfference obtaIned by subtractIng the free- ammoma value from the total Kjeldahl mtrogen value Also, orgamc Kjeldahl mtrogen may be determIned dIrectly by removal ofammoma before dIgestIon 4 Sample HandlIng and PreservatIon 4,1 Samples may be preserved by addItIon of2 ml ofconc H2S04per lIter and refngeratIOn at 4°C Even when preserved In this manner, converSIOn of orgamc mtrogen to ammoma may occur Therefore, samples should be analyzed as soon as pOSSIble 5 Interferences 5 1 Iron and chromIUm IOns tend to catalyze whl1e copper Ions tend to InhIbIt the Indophenol color reactIon 6 Apparatus 61 Techmcon AutoAnalyzer conSIstIng of 6 1 1 Sampler II, eqmpped WIth contInuous mixer 6 1 2 Two proportIOmng pumps 6 1 3 Mamfold I 6 I 4 Mamfold II 6 1 5 Contmuous digester 6 1 6 Planetary pump Approved for NPDES, pendmg approval for SectIon 304(h), CWA Issued 1971 Edltonal reVISIon 1974 and 1978 351 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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