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Nitrification

AQA A-level BiologyNutrient CyclesLesson 6 of 13

Nitrification is the conversion of ammonium ions (NH4+) into nitrate ions (NO3−) by nitrifying bacteria. It happens in two steps, each carried out by a different group of bacteria:

NH4+ → NO2− → NO3−

1. Ammonium ions are oxidised to nitrite ions (NO2−), for example by Nitrosomonas.
2. Nitrite ions are oxidised to nitrate ions, for example by Nitrobacter.

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