Total Magnesium
SCOPE AND FIELD OF APPLICATION
This method is applicable to all fertilisers, except magnesium ammonium nitrate., in Group 1(a) of Section A of the table in Schedule 1 of the Fertilisers Regulations 1990.
PRINCIPLE OF METHOD
The sample is ashed and dissolved in dilute hydrochloric acid or, if it contains no organic substances, it is dissolved directly in dilute hydrochloric acid. The solution is diluted and the magnesium content of the extract is determined by atomic absorption spectrophotometry.