流动注射-光度微传感器快速测定食品中甲醛

Rapid Determination of Formaldehyde in Food by Flow Injection-spectrometric Micro-sensor

将流动注射装置与光度微传感器耦合,形成连续自动光度分析系统,以甲醛-间苯三酚为反应体系,对反应条件及流动注射各实验参数进行了优化,建立了快速测定食品中甲醛的新方法。该法的线性范围为1.00～20.0μg/ml,检出限为0.10μg/ml,用于食品样品中甲醛的测定,测定结果的相对标准差不大于8.6%,加标回收率在90.6%～107%之间,每小时可测定90个样品。

A analytical system of continuous and automatic spectrometer was formed in conjunction of flow injection setup with spectrometric micro-sensor. A new rapid spectrometric method was developed for determination of formaldehyde in food with presented instrument, which was based on the reactive system of formaldehyde-phloroglucinol. The reaction condition and analytical parameters of flow injection were optimized. The linear range of determination of formaldehyde was 1.00~20.0 μg/ml and the detection limit was 0.10 μ g/ml. This method was applied to determination of formaldehyde in food samples. The relative standard deviations of results were less than 8.6% and the spiked recovery was between 90.6% and 107%. The sampling frequency was 90 per hour.