肉桂醛—苯甲醛双组分体系的紫外光谱特性研究

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

研究了肉桂醛和苯甲醛的紫外吸收光谱,肉桂醛的最大吸收峰位于291nm,在该坡长下,肉桂醛在0.8～8 mg/L的浓度范围内,其浓度与吸光度符合朗伯—比耳定律;苯甲醛的最大吸收峰位于249nm,在1～12mg/L的浓度范围内,苯甲醛溶液浓度与其吸光度也符合朗伯—比耳定律.根据朗伯—比耳定律和吸光度的加和性推导出混合体系中苯甲醛和内桂醛含量的快速测定公式:c_(苯甲醛)=8.329×10^(-5)×A_(A~·_1)~总-9.627×10^(-6)×A_(A~·_1)~总,c_(桂醛)= 4.123×10^(-5)×A_(A~·_1)~总-4.375×10^(-6)×A_(A~·_1)~总.

The UV spectrophotometry of cinnamaldehyde and benzaldehyde have been studied.The maximal absorption peak of cinnamaldehyde is 291nm.In this range its absorbency and coricentration accord with Lainbert-Beer＇s law when the concentration of cinnamaldehyde is between 0.8～8mg/L;the maximal absorption peak of benzaldehyde is 249nm.Inthis range its absorbency and concentration also accord with Lambert-Beer＇s law when the concentration of benzaldehyde is beween 1～12mg/L.In order to determining the contents rapidly 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苯甲醛=8.329×10^-5×A^总λ2-9.627×10^-6×A^总λ2,c桂醛=4.123×10^-5×A^总λ2-4.375×10^-6×A^总λ2.