阳离子交换树脂分离-氢化物发生原子荧光光谱法测定食品中无机砷

HG-AFS Determination of Inorganic Arsenic in Food After Separation with Cation Exchange Resin

提出了以阳离子交换树脂分离无机砷与一甲基胂和二甲基胂,用氢化物发生-原子荧光光谱法测定食品中无机砷含量。对阳离子交换柱的制备,洗脱液的pH值和流速,共存离子的干扰等分析条件做了试验并予以优化。方法的检出限(3s/k)为0.76μg·L^(-1),相对标准偏差(n=12)为1.8%。该方法应用于黄瓜样品中无机砷含量的测定,加标回收率在96.3%～98.2%之间。

Micro-amounts of inorganic arsenic in food was separated from MMA and DMA by cation exchange resin, and determined by HG-AFS Preparation of the cation exchange column and analytical conditions, including pH of eluent, flow rate of eluent, and interferences of the coexisting ions were studied and optimized. Detection limit （3s/k） found was 0. 76μg·L-1, and RSD （n=12） was 1.8%. The proposed method was used in the determination of inorganic arsenic in cucumber sample, giving the values of recovery in the range of 96. 3%--98. 2%.