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Determination of Total Nitrogen

Determination of Total Nitrogen. Dumas Combustion Method. Principle. Heating the sample at T > 850 °C + O 2 Mineral and organic nitrogen compounds are oxidized and/or volatilized. The combustion products are oxides of nitrogen (NO x ) and molecular nitrogen.

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Determination of Total Nitrogen

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  1. Determination of Total Nitrogen Dumas Combustion Method

  2. Principle • Heating the sample at T > 850 °C + O2 • Mineral and organic nitrogen compounds are oxidized and/or volatilized. • The combustion products are oxides of nitrogen (NOx) and molecular nitrogen. • After transforming all nitrogen into molecular nitrogen, the content of the nitrogen gas is measured using e.g. thermal conductivity

  3. Comments • „Total-N“ better: Dumas-N (GB) • Term: „air drying < 40°C “ as the method of choice (FIN, AFNOR, AUST) • Losses of ammonia in liquid samples (sludges) after drying (FR, GB), use of moist samples ? Description of microwave pretreatment (AFNOR)

  4. Comments • Detector: „at least 850°C“ (NE) • Detector: „thermal conductivity or other device specific detectors“ (AUST) • Reference compounds: „EDTA or other certified reference materials“ (AUST) • Burning assistance substances – deleted • Results: in % and mg/g (DIN)

  5. SO13 ; < 2mm 0,32 % N S = 0,03 % N S rel = 9 SO13 ; < 250 μm 0,33 % N S = 0,01 % N S rel = 3 CW KAS3 ; < 2mm 1,86 % N S = 0,07 % N S rel = 4 CW KAS3 ; < 250 μm 1,78 % N S = 0,01 % N S rel = 1 Method variations Precision data: soil / biowaste: Milling quality:

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