Study on the UV—absorption Characteristics of Cinnamaldehydeand Beuzaldehyde Cinnamaldehyde and Benzaldehyde

The UV spectrophotometry of cinnamaldehyde and benzaldehyde have been studied.The maximal absorption peak of cinnamaldehyde is 291 nm. In this range its absorbency and concentration accord with Lambert-Beer's law when the concentration of cinnamaldehyde is between 0.8～8mg/L;the maxi- mal absorption peak of benzaldehyde is 249 nm.In this range its absorbency and concentration also accord with Lambert-Beer's law when the concentration of benzaldehyde is between 1～12mg/L.In order to determining the contents r apidly in the two-component system of benzaldehyde and cinnamaldehyde, two calculation formulas which were deduced from Lambert-Beer's law and the addition of absorbency were listed separately as below:c_(笨甲醛)=8.329×10_(-5)×A_(λ1)~总-9.627×10~(-6)×A_(λ2)~总,c_(桂醛)=4.123×10~(-5)×A_(λ2)~总-4.375×10~(-6)×A_(λ1)~总.