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63 With Block Dlgestor In manual mode set low and high temperature at 160°C and preheat umt to 160°C Place tubes In dlgestor and sWitch to automatic mode Set low temperature timer for 1hour Reset high temperature to 380°C and set timer for 2112 hours 6 4 Cool sample and dilute to 25 ml with distilled water If TKN IS determmed the sample should be diluted with ammoma-free water Colonmetnc AnalysIs 6 4 1 6 4 2 Check the level ofall reagent contamers to ensure an adequate supply Excludmg the molybdate/antimony hne, place all reagent hnes m their respectIve contaIners, connect the sample probe to the Sampler IV and start the proportlOmng pump Flush the Sampler IV wash receptacle with about 25 ml of4% sulfunc aCid (5 7) 643 6 4 4 When reagents have been pumpmg for at least five mmutes, place the molybdate/antimony hne In ItS contamer and allow the system to eqUlhbrate 6 4 5 After a stable baselIne has been obtamed, start the sampler 7 CalculatIons 7 1 Prepare a standard curve by plottIng peak heights of processed standards agamst concentratIOn values Compute concentratIOns by companng sample peak heights with the standard curve 8. PreCIsion and Accuracy 8 1 In a sIngle laboratory (EMSL) usmg sewage sample contammg total P at levels of 0 23, 1 33, and 20, the precISion was ±O 01, ±O 04, and ±O 06, respectively 82 In a smgle laboratory (EMSL) usmg sewage samples ofconcentratIOn 1 84 and 1 89, the recovenes were 95 and 98%, respectively Blbbography 1 McDamel, W H , Hemphill, R N and Donaldson, W T , "Automatic Determmatlon of Total Kjeldahl Nitrogen m Estuanne Water", Techmcon Symposia, pp 362-367, Vol 1,1967 2 Gales, M.E and Booth, R L , "EvaluatIOn of Orgamc NItrogen Methods", EP A Office of Research and Momtonng, June, 1972 3 Gales, M E and Booth, R L , "Simultaneous and Automated DetermmatlOn of Total Phosphorus and Total Kjeldahl Nitrogen", Methods Development and Quahty Assurance Research Laboratory, May, 1974 4. Techmcon "Total Kjeldahl Nitrogen and Total Phosphorus BD-40 DigestIOn Procedure for Water", August, 1974 5 Gales, M E , and Booth, R L , "Evaluation of the Techmcon Block Dlgestor System for the Measurement of Total KJeldahl Nitrogen and Total Phosphorus", EPA-600 /4-78-015, EnVironmental Momtonng and Support Laboratory, Cmcmnatl, OhIO 3654-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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