离子色谱法测定食品添加剂三聚磷酸盐中的杂质含量

Ion Chromatographic Method for Determination of Impurities in Tripolyphosphate

研究了离子色谱法检测食品添加剂三聚磷酸盐中杂质含量的分析方法。用NaOH梯度淋洗,流速为1 8mL/min,成功地同时测定了三聚磷酸盐中的Cl-、NO-4、磷酸盐、焦磷酸钠、三偏磷酸钠等杂质的含量。各杂3、SO2-质在检测条件下有很好的线性,所测杂质的相对标准偏差范围为0 22%～8 32%。采用AS11型阴离子色谱柱,样品测定的整个过程可在15min内完成。实验结果表明,该方法具有分析时间短、线性范围宽、灵敏准确、试剂用量少等优点。

Anionchromatographic procedure is described for the determination of impurities in tripolyphosphate. Separation was performed with NaOH as gradient mobile phase at a flow rate of 18 mL/min. Good results were achieved for determinations of Cl-, NO-3, SO2-4, phosphate, pyrophosphate and trimetaphosphate. Good linearities between the peak areas and concentrations of all relevant impurities were achieved. The RSDs of impurities varied between 022% and 832%. The separation of the seven impurities was accomplished with a Dionex IonPac AS11 column and the analysis was completed in 15 min. The method is simple, rapid, sensitive and accurate with a wide linear range and small reagent consumption. 