关键词: 乙酸乙酯, 含量测定, 紫外-可见光谱, 显色反应, 双波长分光光度法

Abstract:

:A rapid and effective determination method of ethyl acetate （EA） content is helpful for the determination and optimization of EA production technology. This paper proposes a rapid determination method of EA content based on UV-Vis spectroscopy, and verifies the accuracy of the method using a sample derived from the reaction of butanone and hydrogen peroxide. It is found that （ 1 ） the carmine complex derived from the color reaction of EA, hydroxylamine-HCl ethanol and FeCl₃ is of the maximum absorption at 530 nm; （2） by establishing the linear relationship between the absorbance difference at 530 nm and 800 nm and the EA content via the dual-wavelength spectrophotometry, EA content can be successfully quantified; （3） this simple and low-cost method is of reasonably good precision when the color reaction is performed at a FeCl₃/EA molar ratio of not less than 1.1 in a 100℃boiling-water bath for 40 s, and when the detection of UV spectroscopy is finished within 60 s ; and （4） the content determination error and recovery of EA derived from the reaction of butanone and hydrogen peroxide reach 1.79% and 95.5% - 105.0%, respectively.

Key words: ethyl acetate, content determination, UV-Vis spectrum, color reaction, dual-wavelength speetrophotometry