乙酰丙酮分光光度法测定甘油缩甲醛中游离甲醛含量

Determination of Free Formaldehyde in Glycerol Formal by Acetylacetone Spectrophotometry

关键词:  乙酰丙酮，分光光度法，甘油缩甲醛，甲醛

Key words:  acetylacetone,spectrophotometry,glycerol formal,formaldehyde

摘要:

乙酰丙酮与甲醛在乙酸-乙酸铵介质中形成黄色化合物,该化合物在波长411nm处有最大吸收。结果表明甲醛在比色液中含量小于4μg/mL时符合比尔定律，线性相关系数r2=0.9999。对样品平行６次测定相对标准偏差为0.68%～1.62%，回收率为91.2%～93.8%。该方法测定甘油缩甲醛中游离甲醛含量简便、快捷，准确可靠。

Abstract:

Formaldehyde reaction with acetylacetone to form a yellow complex with a maximum absorption at 411nm under the condition of acetic acid- ammonium acetate．Beer’s law is obeyed in the concentration range of 0～4 μg /mL，it’s correlation coefficient R2 as 0.9999． The recoveries rate of method are 91.2%～93.8% and the relative standard deviations are 0.68%～1.62% for 6 parallel determinations of glycerol formal samples．Results indicate that the method was reliable and accurate