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NITROGEN, AMMONIA Method 350.1 (Colorimetric, Automated Phenate) STORET NO. Total 00610 Dissolved 00608 1 Scope and ApphcatlOn 11 Th1s method covers the determmatlOn of ammoma m drmkmg, surface, and sahne waters, domest1c and mdustnal wastes m the range of 0 01 to 20 mg/l NH3 as N Th1s range 1S for photometnc measurements made at 630-660 nm m a 15 mm or 50 mm tubular flow cell H1gher concentratIOns can be determmed by sample dl1utlOn ApproX1mately 20 to 60 samples per hour can be analyzed 2 Summary of Method 2 1 Alkahne phenol and hypochlonte react w1th ammoma to form mdophenol blue that 1S proportIOnal to the ammoma concentratIOn The blue color formed 1S mtens1fied w1th sodmm mtropruss1de 3 Sample Handhng and PreservatIOn 3 1 PreservatIOn by add1tlOn of2 ml conc H2S04 per hter and refr1geratIOn at 4°C 4 Interferences 41 4 2 Calcmm and magnesmm IOns may be present m concentratIOn suffic1ent to cause prec1p1tatIOn problems durmg analys1s A 5% EDTA solutIOn 1S used to prevent the prec1p1tatIOn of calcmm and magnesmm 10ns from nver water and mdustr1al waste For sea water a sodmm potassmm tartrate solutIOn 1S used Sample turb1d1ty and color may mterfere w1th th1S method Turb1d1ty must be removed by filtratIOn pnor to analys1s Sample color that absorbs m the photometnc range used wl1l also mterfere 5 Apparatus 5 1 Techmcon AutoAnalyzer Vmt (AAI or AAII) cons1stmg of 5 1 1 Sampler 5 1 2 Mamfold (AAI) or Analytical Cartndge (AAII) 5 1 3 ProportlOmng pump 5 1 4 Heatmg bath w1th double delay coll (AAI) 5 1 5 Colonmeter eqUipped w1th 15 mm tubular flow cell and 630-660 nm filters 5 1 6 Recorder 5 1 7 D1g1tal pnnter for AAII (optIOnal) Approved for NPDES followmg prehmmary d1stlllatlOn, Method 3502 Issued 1974 Ed1tonal reV1S10n 1978 350 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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