微波消解-离子色谱法测定面制品中磷酸盐含量

摘要

为建立用微波消解进行样品前处理，离子色谱法测定面制品中的磷酸盐含量的检测方法。用离子色谱带电导检测器进行分离测定，色谱柱为 IonPac AS19（4×250 mm），35 mmol /L 氢氧化钾为淋洗液，流速为1．0 mL/min。结果表明加标回收率在97．0％～115．0％范围，相对标准偏差均小于0．5％，在1．0～50．0 mg/L 范围呈现良好的线性关系，回归系数大于0．999。该法具有操作简便、分析快速、准确等优点，能满足面制品中磷酸盐含量检测要求。%Phosphate in wheat flour products,which was pretreated by microwave digestion technique, was determined by ion chromatography equipped with a conductivity detector.The chromatographic col-umn was IonPac AS19(4 ×250 mm)and the mobile phase was 35 mmol /L KOH solution at a flow rate of 1.0 mL/min.The result showed that the recovery rate for this method was 97.0%~115.0% and the rel-ative standard deviation was less than 0.5% .The linear regression coefficientwas higher than 0.999 within the concentration range of 1.0 ~50.0 mg/L.As a simple and rapid testing,this method showed satisfied accuracy and was suitable for the determination of phosphate in wheat flour products.