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Paragraph 6 PREPARATION OF THE SOLUTION TO BE ANALYSED

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Preparation of the boron solution

6.1

See Methods 25a and/or 25b and, if appropriate, 25c.

Preparation of the test solution

6.2

Dilute an aliquot portion of extract (6.1) to obtain a boron concentration as specified in 7.2. Two successive dilutions may be necessary. Let D be the dilution factor.

Preparation of the correction solution

6.3

If the test solution (6.2) is coloured, prepare a corresponding correction solution by placing in a plastic flask 5 ml of test solution (6.2), 5 ml of EDTA buffer solution (4.1) and 5 ml of water and mix thoroughly.