Determination of Nitrogen content in fertilizer samples
The Kjeldahl method is a wet chemistry technique suitable for quantifying specific nitrogen forms such as ammonia, and urea nitrogen. With additional reduction steps, it can also measure nitrate. This makes it ideal when customers need detailed nitrogen speciation.
The Dumas method is a rapid combustion-based technique that converts all nitrogen into measurable nitrogen gas. It requires minimal sample preparation and delivers fast, accurate total nitrogen results, making it well-suited for routine analysis or when nitrogen sources are unknown.
We can recommend the appropriate method based on your objective—whether you need total nitrogen for compliance and labeling, or breakdown of nitrogen sources for formulation and quality control. Proper method selection ensures accurate results, regulatory compliance, and confidence in product specifications.
Analytical parameter
Total nitrogen, urea nitrogen, ammonical nitrogen, nirate nitrogen
Test Method
Wet digestion & distillation (Kjeldahl)
Combustion (Dumas)
Sample requirement
Well homogenized sample with minimum size 50g
Application
Fertilizer nutrient labelling, raw material quality control and formulation.
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