红外光谱在分析制样技术中的应用研究

[目的]为了选用合适的制样方法。[方法]介绍了样品的常规制样方法——固体样品的KBr压片和KCl压片法以及液体样品的可拆液体池法,并且比较了这些方法的优缺点,对于压片法的不足之处,提出了一种改进的制样方法:以空白KBr压片作片基,通过浸渍法制样。[结果]对于固体样品,将其溶解于挥发性有机溶剂,浸渍法制样;对于高沸点液体样品,将样品用挥发性有机溶剂稀释,采用浸渍法制样,即把空白KBr压片在稀释后的溶液中浸渍后在红外灯下挥发掉有机溶剂后制样。[结论]通过与常规压片法对比,这种改进的制样方法所得的谱图能达到定性分析的要求,且弥补常规压片法的不足。

Research of Application in Sample Preparation Technology for Infrared Spectrum

The research aimed to select the appropriate sample preparation method. [Method]The sample of conventional sampling method——solid samples of KBr pressed method and KCl pressed method,and liquid samples of removable liquid cell method were described,and the advantages and disadvantages of these methods were compared at last. A modified method as for the disadvantages of pressed method had been put forward： impregnation,which was made by blank KBr tablet for film base. [Result]As for solid samples which could be dissolved in volatile organic solvents,this method could be used. And for high boiling point of liquid samples,the samples could be diluted by volatile organic solvents,then sampled by impregnation,in the other words,which was sampled after the blank KBr tablet with diluted organic solvent evaporated under the condition of infrared light. [Conclusion] Through comparison with the conventional pressed method-KBr pressed method,infrared spectrum of this modified preparation method could achieve the request of qualitative analysis,and made up the deficiency of conventional pressed method.