Determination of Trace Sodium Iodide in Food Color Additive Erythrosine Using High Performance Liquid Chromatography with Inductively Coupled Plasma-mass Spectrometer
MA Kang1,SONG Zeng-Liang2,CHAO Jing-bo1,WEI Chao1,ZHANG Jin-na3
1. National Institute of Metrology, Beijing 100013, China
2. Hebei Measurement Supervision and Testing Institute, Shijiazhuang, Hebei 050051, China
3. Beijing University of Science and Technology, Beijing 100083, China
Abstract：High performance liquid chromatography with inductively coupled plasma mass spectrometer method is developed for quantitative determination of trace sodium iodide in food color additive erythrosine.The mobile phase containe methanol and ammonium acetate buffer solution at pH 6.4 and an ODS-C18 column is used to separate sodium iodide with erythrosine.The method quantitative detection limit and detecting limit are respectively 10.0ng/g and 3.0ng/g,linearity range is 10~1 000ng/g ,the precision are in range of 0.37%~0.43% and the recovery is range from 97.5%~99.7%. This method is successfully applicable for use in the determination of trace sodium iodide in real sample,and uncertainty of measured result is evaluated and the uncertainty is 3.9% (k=2).
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2012, Vol. 33 
