Abstract
A method for the determination of Kjeldahl nitrogen has been developed that uses a block digester and a low-toxicity copper-titanium catalyst. A nicotinic acid solution (200.0 mg l–1 of N) was determined with a standard deviation of 1.6 mg l–1 of N and a nitrogen recovery of 95.6%. The limit of detection was 0.85 mg l–1 of N. The development and testing of the method on sewage effluents, trade effluents and sewage sludges is presented. Results are compared with those obtained by the widely accepted mercury catalyst method.
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