Electromagnetic dispersive solid‐phase extraction based on polyaniline‐coated magnetite/silica materials for the determination of Sudan red I in drinks
Youqing Sun, Yugao Guo, Jianpo Ren, Lieyi Ji, Qingyin Zhang
Abstract
Abstract By replacing the permanent magnet with an electromagnet, traditional magnetic solid‐phase extraction was developed into electromagnetic dispersive solid‐phase extraction. A simple operation of power on and off can realize the separation of adsorbents from solutions easily. The improvement makes it possible for the automation of the determination of Sudan Red I by high‐performance liquid chromatography. After series of optimization, a trace amount of Sudan red I was well‐determined, and excellent linearity was achieved in the range of 0.005 to 1 mg/L with the correlation coefficient ( R 2 ) = 0.997. The limit of detection with a signal‐to‐noise ratio of 3 was found to be 0.001 mg/L. The spiked recoveries of Sudan red I for the samples ranged from 93.6 to 104.9%. Moreover, the adsorbent could be recycled at least ten times. The results show that the electromagnetic dispersive solid‐phase extraction combined with high‐performance liquid chromatography is a rapid, eco‐friendly, effective, and sensitive determination method with fascinating automation potential and high practical applicability.