面粉和面制品中痕量溴酸盐的离子色谱测定法

Determination of Trace Bromate in Flour and Products by Ion Chromatography

目的建立并完善面粉及面制品中溴酸盐的离子色谱测定法。方法用电导检测-离子色谱仪。以 Ionpac^R AS9-HC 色谱柱,9.0mmol/L 碳酸钠为淋洗液,流量为1.0ml/min。样品经纯水经微波超声提取 BrO_3^-,用超滤杯去除样品提取液中的水溶性大分子,直接进样测定。结果该方法的最低检出限为0.01mg/L,定量检出限为0.1 mg/kg。相对标准偏差为0.6%～7.6%。样品回收率为97.8%～103.6% 结论该方线性范围广,操作简单,快速,准确,分离效果好,可与常见共存阴离子同时分析,灵敏度高,重现性好,可满足对面粉和面制品中溴酸盐含量的测定要求,适合推广使用。

Objective To establish a method for determination of trace bromate in flour and the products by ion chromatography. Methods Conductance - ion chromatography and Ionpac^R AS9-HC column were employed and 9.0 mmol/L sodium carbonate was used as the eluent, the flow rate was 1.0 ml/min. BrO3^- in the samples soaked in the purified water was extracted by ultrasonic microwave, the water-soluble macromotecules were removed by ultra filtration cup in the extract, then the direct injection determination was conducted. Results The lowest detection limit was 0.01 mg/L, the quantitative detection limit was 0.03 mg/kg, the relative standard deviation was 0.6% -7.6%, the recovery rate was 97.8% - 103.6%. Conclusion This method is simple, rapid, accurate, sensitive and is applicable to the determination of trace bromate in flour and the products.