Abstract
Abstract It was proved that various modifications of the Kjeldahl method for determining the nitrogen content of raw rubber (with phosphoric-sulfuric acid, sulfate-sulfuric acid, mercury, copper, selenium) do not yield greatly differing values. The use of selenium as catalyst is to be preferred, since the time of destruction is shortened considerably. A standard procedure was established. The hydrogenation method of Ter Meulen was applied to a sample of rubber powder (Pulvatex). Since this determination gave the same results as the various modifications of the Kjeldahl method, it is concluded that all these methods are reliable.
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