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Paragraph 7 PROCEDURE

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Test sample

7.1
(a)

Where fertilisers contain no sulfur or where they contain, at the same time, no more than 3% of sulfur (S) i.e. 7.5% SO3, and no more than 4% of calcium (Ca) i.e. 5.6% CaO, weigh out 5 g of fertiliser to within 1 mg.

(b)

Where fertilisers contain more than 3% of sulfur (S) and more than 4% of calcium (Ca), weigh out 1 g of fertiliser to within 1 mg.

Place the test sample in a 600 ml beaker.

Preparation of the solution

7.2

Add approximately 400 ml of water and boil for 30 minutes. Allow to cool, stirring occasionally, and transfer quantitatively into a 500 ml graduated flask. Make up to volume with water and mix.

  • Filter through a dry filter into a dry container.

  • Discard the initial portion of the filtrate. The filtrate must be completely clear.

  • Stopper if the solution is not to be used immediately.