• British Pharmacopoeia Volume V
  • Appendices
  • Appendix I C. Standard Solutions

Fluoride Standard Solution (10 ppm F)
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Fluoride Standard Solution (10 ppm F) Dissolve in water R sodium fluoride R previously dried at 300 °C for 12 h, equivalent to 0.442 g of NaF, and dilute to 1000.0 mL with the same solvent (1 mL = 0.2 mg F). Store in a polyethylene container. Immediately before use, dilute the solution to 20 times its volume with water R.