离子色谱法测定蔬菜水果中氯离子、亚硫酸盐、硫酸盐含量

确立离子色谱法同时检测蔬菜水果中氯离子、亚硫酸盐、硫酸盐含量的样品处理方法和检测条件。在2%甲醛溶液SO32-的稳定剂的作用下,样品用10 mmol/L氢氧化钠溶液提取后,用IonPacAS9-HC型色谱柱为分离柱和9 mmol/L的碳酸钠淋洗液为流动相,电导检测器进行分析。结果表明,Cl-、SO32-、SO42-在2～10μg/mL浓度范围内线性良好(其相关系数分别为0.9973、0.9999、0.9991),样品中Cl-、SO32-、SO42-的加标回收率分别为83.7%～99.2%、80.6%～98.4%、81.0%～100.4%,检出限分别为0.005、0.05、0.01 mg/kg。

Determination of Chlorine, Sulfite, Sulfate Contents in Vegetables and Fruits by Ion Chromatography

The method of sample preparation and testing conditions were presented for simultaneous detection of chlorine,sulfite and sulfate contents in vegetables and fruits by ion chromatography.With 2% formaldehyde solution as stabilizing agent of SO32-,samples were extracted with 10 mmol/L sodium hydroxide solution.Determination of the chlorine,sulfite and sulfate contents in respective vegetables and fruits was made with ionPac AS9-HC separation column,9 mmol/L of sodium carbonate as eluent and conductance detect...