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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0.02μg/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。
In this paper, the determination of trace arsenic and bismuth in steel and alloy by hydride generation-atomic fluorescence spectrometry. The optimum operating conditions of the atomic fluorescence spectrometer, the influence of acidity, the interference ion limit and the concentration of reducing agent were studied. By adding thiosemicarbazide - ascorbic acid and phosphoric acid can effectively inhibit the matrix element interference. The detection limits were as follows: arsenic 0.04μg / g, bismuth 0.02μg / g (3σ, n = 11). The method was applied to the determination of trace amounts of arsenic and bismuth in low alloy steel, iron-nickel-base superalloy, nickel base superalloy, cobalt base superalloy and copper alloy with satisfactory results. Experiments show that the method has the advantages of high sensitivity, good accuracy, fastness and convenience.