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铝是易形成高温氧化物的元素之一,用空气-乙炔火焰通常无法直接测定.曾有用铝使铁增感的性质间接测定铝的报道.本文鉴于铝与N-亚硝基苯胶铵(铜铁试剂)反应形成的络合物比铅与铜铁试剂的生成物更加稳定,更难溶于水而易溶于有机溶剂的性质,使水相中的铝将有机相内络合物中的铅置换出来,用空气-乙炔火焰测定水相中的铅,间接测定铝.置换反应中,铝的原子量远小于铅的原子量,使测定灵敏度比较高,为0.048μg/mL.l%.工作曲线线性范围为0~5μg/mL.我们用该法测定了铜合金中的铝,获得了满意的结果.
Aluminum is one of the most readily oxidizable elements and can not usually be measured directly with an air-acetylene flame. There have been reports of the indirect determination of aluminum by the sensitization of iron by aluminum. Copper and iron reagent) than the reaction of lead and copper and iron reagent products more stable, more difficult to dissolve in water and soluble in the nature of the organic solvent, so that the aqueous phase of the organic phase complexes will be Of the lead out of the air - acetylene flame determination of lead in the aqueous phase, indirect determination of aluminum replacement reaction, the atomic weight of aluminum is much smaller than the atomic weight of lead, the determination of sensitivity is relatively high, 0.048μg / mL.l%. The linear range of the curve is 0 ~ 5μg / mL. We used this method to determine the aluminum in the copper alloy and obtained satisfactory results.