本文采用氢化物发生-原子荧光光谱法测定钢铁及合金中痕量砷和铋.研究了原子荧光光谱仪最佳操作条件、酸度的影响、共存干扰离子限量以及还原剂的浓度.通过加入硫代氨基脲-抗坏血酸和磷酸能够有效地抑制基体元素的干扰.方法检出限分别为:砷0.04μg/g,铋0.02 μg/g(3σ,n=11).本方法用于测定低合金钢、铁镍基高温合金、镍基高温合金、钴基高温合金以及铜合金中痕量的砷和铋,结果满意.试验表明,该方法具有灵敏度高、准确性好、快捷、方便等优点.%An analysis method for determining trace arsenic and bismuth in iron, steel and alloys by hydride generation-atomic fluorescence spectrometry (HG-AFS) is presented. The operation parameters of AFS, effects of acidity, limit of coexisting ions and concentration of reducing agent have been tested. Thiosemicarbazide-ascorbic acid and phosphoric acid were used to eliminate the interference of matrix elements. The detection limits of arsenic and bismuth are 0.04 μg/g and 0.02 μg/g(3σ, n = 11), respectively. The method has been applied to determine trace arsenic and bismuth in middle and low alloy steel, ferronickel-base superalloy, nickel-base superalloy,cobalt-base superalloy and copper alloy with satisfactory results. The method was proved to be sensitive, accurate, quick and convenient.
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