Über den Anwendungsbereich der Aminostickstoffbestimmung mittels salpetriger Säure

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Abstract
The causes of positive or negative discrepancies in the estimation of primary amino groups by means of the van Slyke method were investigated. Excess N production occurred with a number of groups of substances such as isonitroso compounds, compounds with reactive methylene groups, monohalogen substituted acetic acids, phenols, indole derivatives, etc. In most cases the reasons for the excess N evolution are not well understood. Low values are found when primary amine is difficult to diazotise, when stable diazonium salts are formed or when the diazonium salts undergo side reactions. Excess production of N may be minimized by using dilute nitrite and adding iodide; low values may be increased by heating.

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