The Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1991 No. 540

SCHEDULE 2 METHODS OF ANALYSIS

5. DETERMINATION OF TOTAL NITROGEN IN UREA

8.    EXPRESSION OF THE RESULT

Express the result as the percentage of nitrogen (N) contained in the fertiliser as received for analysis.

• Variant (a): N% = (50−A) × 1.12

• Variant (b): N% = (50−A) × 1.12

• Variant (c): N% = (35-A) × 1.40

Where A = millilitres of sodium or potassium hydroxide used for the titration.