Procedures
1. Preparation of sample
Grind or blend sample until homogenous. If sample cannot be analysed on the same day,
keep in closed container in a freezer. For samples intended for analysis of vitamins or other
labile nutrients, flush sample with nitrogen before storing.
2. Analysis
2.1 Blank: include two reagent blanks (containing all reagents used in nitrogen analysis except
the sample) in every batch of analysis to subtract reagent nitrogen from the sample nitrogen