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Determination of Nitrogen Fractions - Comments

Determination of Nitrogen Fractions - Comments. Ammonium and Nitrate. Pretreatment and losses of analytes Extraction conditions:. Reference to preatreatment study and „interferences and errors“ Changed: fresh samples extracted in one step in 1M KCl, different ratios for

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Determination of Nitrogen Fractions - Comments

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  1. Determination of Nitrogen Fractions - Comments Ammonium and Nitrate

  2. Pretreatment and losses of analytes Extraction conditions: Reference to preatreatment study and „interferences and errors“ Changed: fresh samples extracted in one step in 1M KCl, different ratios for soil (1:5) and sludge and treated biowaste (1:20-1:80) Measure an aliquot of the filtrate or supernatant Comments

  3. Other Comments • Use of other extractants (AUST): water, CaCl2 (0,02M), 2,5 M KCl • Dialysis step for purification from humic acids (NEN) • Comparison to Recovery in prEN 14671 (FIN)

  4. Extractant 1:10 Ammonium mg/l KCl 2 M 3,4 +/- 0,4 KCl 1 M 3,6 +/- 0,2 KCl 0,2 M 3,1 +/- 0,1 CaCl2 0,02 M 2,7 +/- 0,1 H2O, tridest 1,6 +/- 0,1 Analysis in different matrices n = 2

  5. KCl Ratio: (w/V) Shaking time ( hours) NH4-N Recov. % NO3-N Recov. % 1 M 1 : 10 1 x 1 h 96 96 1 M 1 : 10 2 x 1 h 98 101 1 M 1 : 10 3 x 1 h 98 101 Recovery in soilWEPAL soil, < 2 mm

  6. KCl Ratio: sample / extractant Shaking time ( hours) NH4-N % Recovery 2 M 1 : 5 1 x 1 h 71 +/- 6 2 M 1 : 10 1 x 1 h 85 +/- 7 2 M 1 : 5 2 x 1 h 87 +/- 7 2 M 1 : 10 2 x 1 h 92 +/- 7 1 M 1 : 5 1 x 1 h 66 +/- 6 1 M 1 : 10 1 x 1 h 88 +/- 7 1 M 1 : 10 2 x 1 h 81 +/- 7 1 M 1 : 10 1 x 2 h 76 +/- 6 1 M 1 : 10 16h standing at 20°C, then 1x1h 60 +/- 6 Recovery in treated biowaste

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