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3.5 Urea nitrogen, either:
3.5.1 By conversion using urease, into ammonia, which is determined by titration with a standard solution of hydrochloric acid.
Or:
3.5.2 By gravimetry using xanthydrol: although biuret will also be precipitated by xanthydrol, this should not give rise to a significant error in the determination since its level is generally low in absolute value in compound fertilisers.
Or:
3.5.3 By difference, according to the following table:
| Case | Nitric nitrogen | Ammoniacal nitrogen | Difference |
|---|---|---|---|
| 1 | Absent | Present | (3.1.1) – (3.4) |
| 2 | Present | Present | (3.2) – (3.4) |
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