离子色谱法测定面粉及面粉制品中溴酸盐

Determination of Bromate in Flour and Flour Products by Ion Chromatography

提出了离子色谱法测定面粉及面粉制品中溴酸盐的测定方法。样品经水提取，固相萃取，银柱净化处理后进行色谱分析。采用色谱柱为IonPac AS19型阴离子分离柱（2 mm×250 mm）；ASRS-ULTRAⅡ2 mm阴离子抑制器，检测器为ED50抑制型电导检测器。方法的线性范围在200μg.L^-1内。检出限为0.01 mg.kg^-1，加标回收率为92.9%-99.5%，相对标准偏差为（n=6）小于5%。

An ion chromatographic method for the determination of bromate in flour and flour products was proposed and reported in this paper. Bromate was first extracted from the sample with water and purified by solidphase extraction on a silver column, then determined by ion chromatography. Chromatographic separation was carried out on IonPac AS19 column （2 min×250 mm） with ASRS-ULTRA Ⅱ anion suppresor, and a suppressed conductivity detector was used to the determination. Linearity of the calibration curve was obtained within 200μg.L^-1 of hromate. Detection limit （3S） of the method was 0. 01 mg.kg^-1, RSD＇s （n=6） found were less than 5% and recovery was in range of 92. 9%--99.5%.