Rapid coulometric method for the Kjeldahl determination of nitrogen.
A rapid coulometric method for the Kjeldahl determination of nitrogen is described. The samples are digested by means of the Tecator AB digestion system which permits forty samples to be digested at the same time. The digestion products are diluted to 75 ml and 1 ml is coulometrically titrated in 1-2 min: 20-30 determinations can be performed per hour. For substances containing nitrogen in the per cent range the relative standard deviations for eight different substances were 0.1-1%.
Boström
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CA
Department of Analytical Chemistry, University of Umeå, 901 87 Umeå, Sweden.
Cedergren
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A
Johansson
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G
Pettersson
I
I