• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Phthalaldehyde Reagent
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Phthalaldehyde Reagent Dissolve 2.47  g of boric acid in 75  ml of water, adjust the pH to 10.4 with a 45% w/v solution of potassium hydroxide and add sufficient water to produce 100  ml. Dissolve 1.0  g of phthalaldehyde in 5  ml of methanol , add 95  ml of the boric acid solution and 2  ml of mercaptoacetic acid and adjust the pH to 10.4 with the potassium hydroxide solution.

Store protected from light and use within 3 days of preparation.