基于碘对亚砷酸 硫酸铈的催化反应 ,断续流动进样 ,用氢化物发生 原子荧光光谱法直接测定As 的浓度变化 ,建立了微量碘间接测定的方法。在实验条件下 ,碘离子的线性范围为 0～ 80 μg L ;相对标准偏差为 2 3%;检测限为 4μg L ;加标回收率为 92 5 %～ 98 2 %。测定结果与硫氰酸铁 亚硝酸催化动力学法相比具有很好的一致性。 Based on the catalytic reaction of iodine with cerium arsenite and intermittent flow injection, the concentration of As was directly determined by hydride generation atomic fluorescence spectrometry, and a method of indirect determination of trace iodine was established. Under the experimental conditions, the linear range of iodide was 0 ~ 80 μg L, the relative standard deviation was 23%, the detection limit was 4 μg L, and the recoveries were 92 5% ~ 98 2%. The results are in good agreement with the catalytic kinetics of ferrous thiocyanate.