Potassium Chloride

Of the British Pharmacopoeia.

Potassium chloride used for infrared absorption spectrophotometry also complies with the following additional test.

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.