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The Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1991
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4.3 REAGENTS
Magnesium standard solution: dissolve 1.013 g magnesium sulphate (MgSO4.7H2O) in 0.5 N hydrochloric acid solution (4.2) and dilute to 100 ml with this acid.
1 ml of this solution contains 1 mg of magnesium (Mg).
or
weigh out 1.658 g of magnesium oxide, previously calcined at 600°C for 2 hours, place in a beaker with 100 ml of water and 120 ml of approximately N hydrochloric acid (4.1). After dissolution, transfer quantitatively into a one litre graduated flask, make up the volume with water and mix.
1 ml of this solution contains 1 mg of magnesium (Mg).
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