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This method is applicable to all fertilisers.
Solubilisation by boiling in dilute hydrochloric acid.
Diluted hydrochloric acid:
One volume of hydrochloric acid (d = 1.18) plus one volume of water.
Electric hot plate with adjustable temperature.
See Method 1.
6.1 Magnesium is extracted from a test sample of five grams weighed to within one milligram.
6.2 Add approximately 400 millilitres of water and, taking care when the sample contains a significant quantity of carbonates, 50 millilitres of dilute hydrochloric acid (4.1) a small amount at a time. Bring to the boil and maintain for 30 minutes. Allow to cool, stirring occasionally. Decant quantitatively into a 500 millilitre graduated flask. Make up to volume with water, and mix. Pass through a dry filter into a dry container, discarding the initial portion. The extract must be completely transparent. Stopper if the filtrate is not used immediately.
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