用于红外光谱分析的溴化钾的提纯

Purification of Potassium Bromide Used for Infrared Spectral Analysis

分析纯溴化钾的红外光谱中通常含有杂质产生的强干扰吸收带,不能直接作为红外光谱分析用的试剂。以乙二胺四乙酸(EDTA)为螯合剂,与分析纯溴化钾中的杂质生成水溶性络合物,通过重结晶、高温焙烧,去除了溴化钾中的杂质,得到了高纯度的溴化钾。实验结果表明,该溴化钾的光谱纯度优于市面上价格昂贵的光谱纯溴化钾,获得了更高质量的红外光谱图,降低了红外光谱实验的成本。

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.