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

Water, Nitrate-free
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Water, Nitrate-free To 100 mL of water add a few milligrams of potassium permanganate and of barium hydroxide. Distil using the apparatus described in Appendix V C. Reject the first 10 mL and collect the following 50 mL.