Research of Application in Sample Preparation Technology for Infrared Spectrum
WEN Ji-chang;WANG Jia-feng;Zhongjia Test Center of Guizhou Ltd.;
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.