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Pakistan Journal of Biological Sciences
Year: 1999  |  Volume: 2  |  Issue: 3  |  Page No.: 820 - 825

Interferences by Organic Nitrogen Compounds in Ammonium-N Determination

Muhammad Ayyaz Khan and T.H. Flower    

Abstract: Organic nitrogen compounds were evaluated for interferences in NH4-N determination in water, 2M KCl and 0.5M K2SO4 at NH4-N level of 0 and 1.0 mg l-1. The results revealed that organic nitrogen compounds interfere negatively in NH4-N determination using the Technicon AutoAnalyzer II. Soil extracting solutions like 2M KCl and 0.5M K2SO4 further increased interferences by these compounds. These results suggested that a pre-treatment step either distillation or gas phase dialysis should be included to reduce the interferences caused by the organic nitrogen compounds in the NH4-N determination by the Technicon AutoAnalyzer II.

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