Dyma’r fersiwn wreiddiol (fel y’i gwnaed yn wreiddiol). Dim ond ar ei ffurf wreiddiol y mae’r eitem hon o ddeddfwriaeth ar gael ar hyn o bryd.
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) |
Mae’r holl gynnwys ar gael dan Drwydded Llywodraeth Agored v3.0 ac eithrio ble nodir yn wahanol. Yn ychwanegol mae’r safle hwn â chynnwys sy’n deillio o EUR-Lex, a ailddefnyddiwyd dan delerau Penderfyniad y Comisiwn 2011/833/EU ar ailddefnyddio dogfennau o sefydliadau’r UE. Am ragor o wybodaeth gweler ddatganiad cyhoeddus Swyddfa Gyhoeddiadau’r UE ar ailddefnyddio.
