| 摘要 |
<p>Process for determination of nitrogen, preferably according to Kjeldahl, and/or compounds and/or analytical parameter directly related to said nitrogen. The process comprises (a) at least one pre-treatment, such as a digestion at 300-600 °C, (b) at least one distillation and (c) at least one determination and/or analysis. More specifically, the process of the present invention refers to a new seqeunce of the substeps of said distillation. The distillation comprises the substeps of (i) diluting a pre-treated sample of a nitrogen containing material with at least one diluting fluid, (ii) inlet of steam and commencement of steam distillation, and (iii) addition of at least one alkali compound. The alkali addition is made 1-60, preferably 1-30 such as 2-5, seconds after commencement of said inlet of steam and said steam distillation and the distillate produced during said steam distillation is recovered in an acidic and/or complexing medium, such as boric or sulphuric acid.</p> |
