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

Potassium Bromide
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Potassium Bromide KBr  =  119.0 (7758-02-3)

Analytical reagent grade of commerce.

Potassium bromide used for infrared absorption spectrophotometry complies with the following requirement.

The infrared absorption spectrum , Appendix II A, of a disc 2  mm thick prepared from material previously dried at 250° for 1 hour has a substantially flat baseline over the range 4000 to 620  cm–1; it exhibits no maxima with an absorbance greater than 0.02 above the baseline with the exception of maxima due to water at 3440 and 1630  cm–1.