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

作　　者：唐增煦[1] 马洁[2] 张勐[3] 肖香兰[3] 吴国华[3] 薛颖[3] 

机构地区：[1]中国疾病预防控制中心营养与食品安全所,北京100050 [2]首都师范大学化学系,北京100037 [3]北京市疾病预防控制中心,北京100013

出　　处：《理化检验（化学分册）》2009年第8期979-981,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：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%.

关 键 词：氢化物发生-原子荧光光谱法 无机砷 阳离子交换树脂 

分 类 号：O657.31[理学—分析化学]