Abstract
An enzymatic method for the determination of ammonia—nitrogen, not previously applied in water research, is described. The method is specific for NH3-N, and the risk of hydrolysis of organic nitrogen compounds is very small, because of near neutral pH and low (room) temperature conditions. Differences between results of enzymatic NH3-N determination and of a distillation method depended on the type of water. The method has been adapted for application in sediment research, where the exchangeable NH3-N fraction is determined directly, without an extraction procedure. In comparison with this method, direct distillation of sediment samples gave an overestimation of the NH3-N content of ± 40 per cent.
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