乙酰乙酸乙酯分光光度法测定甲醛的研究  

Determination of formaldehyde with Ethyl acetoacetate by spectrophotometry

作　　者：刘劭钢[1] 梁逸曾[1] 曹佐英[2] 屈元雨[3] 

机构地区：[1]中南大学化学化工学院,长沙410085 [2]湖南理工学院化工系,岳阳414000 [3]湖南邵阳学院化学材料系,邵阳418000

出　　处：《分析试验室》2005年第6期29-31,共3页Chinese Journal of Analysis Laboratory

摘　　要：乙酰乙酸乙酯在弱酸性溶液中与甲醛及铵离子反应,生成2,6-二甲基-1,4-二氢-3,5-吡啶二乙酸乙酯,该化合物在375nm处有最大吸收,以甲醛计的摩尔吸光系数为5.533×103mol·cm-1·L-1;利用该反应建立了测定食品中微量甲醛的新方法,甲醛质量浓度在0.08～4.0mg/L成线性关系。并用质谱分析了产物,证实在水溶液中该反应遵循汉秋希吡啶合成法的原理。The product which formaldehyde reacts with Ethyl acetoacetate and ammonia is 2,6-Ddimethyl-3,5-bis(ethoxycarbonyl)-1,4-dihydropyridine in acidic acetate buffer. The product of the reaction has maximum absorption at 375 nm and the molar absorptivity ε_(375) is 5.533×10~3 mol/cm/L. A new method for the determination of formaldehyde has been developed with this reaction and the linear range is 0.08～4.0 mg/L.

关 键 词：乙酰乙酸乙酯 甲醛 分光光度法 测定 

分 类 号：O657.32[理学—分析化学]