Objective To establish a method for simultaneous determination of chlorine dioxide and its by-products chlorine trioxide in food by ion chromatography. Methods The samples were soaked with ultrasonic wave and extracted by vibration, and then the upper liquid was centrifuged. The upper liquid was analyzed by ion chromatography with AS-19 column separation and 20 mmol/L KOH solution by 1.0 mL/min flow rate isocratic elution, detected by the conductivity detector and quantified by external standard method. Results The mass concentration of the compounds was linearly related to their corresponding peak area. The limit of detection was 0.05 mg/L. The relative standard deviation were 3.6%~8.9% (n=6), and the recoveries were 81.6%~92.5% (n=6), respectively. Conclusion The established method for determination of chlorine dioxide and chlorine trioxide in food is accurate, reliable and practical.
标题:离子色谱法测定食品中的二氧化氯及其副产物
英文标题:Determination of chlorine dioxide and its by-products in food by ion chromatography