Purification of Potassium Bromide Used for Infrared Spectral Analysis

The infrared spectrum of analytical pure potassium bromide generally has the strong interference absorption band that was occurred by impurity,and the analytical pure potassium bromide is directly as reagents used for infrared spectral analysis.With EDTA as chelant,the impurity of analytical pure potassium bromide with EDTA formed water-solution complex,and the impurity of potassium bromide was removed via the recrystallization and high temperature roasting,then high purity potassium bromide was obtained.The obtained potassium bromide is better than selling expensive spectrum pure potassium bromide,and higher quality infrared spectra is obtained,the cost of the infrared spectrum experiment reduceds.