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Paragraph 5 APPARATUS

Original text. Later amendments are not shown.

Rotary shaker set at about 35 to 40 rpm.

5.1

5.2

pH-meter.

Note:

Where the boron content of the extract is to be determined, do not use borosilicate glassware. Teflon or silica is preferable for this extraction. Rinse the glassware thoroughly if it has been washed in detergents containing borates.