原子吸收光谱法测定镁合金中锰含量

Atom absorption spectrometry determination of manganese content in magnesium alloy

用原子吸收法替代亚砷酸钠-亚硝酸钠容量法和高碘酸钾光度法,对镁合金中的锰（质量分数0.10%~2.0%）进行测定。试验表明,当镁合金中w（A l）〉0.50%（最高为9.1%）时,铝对锰测定的干扰明显,在还原性乙酸介质中加入苯甲酸铵,与铝离子生成苯甲酸铝沉淀,过滤分离沉淀,消除了试液中的大量铝离子对锰测定的干扰;回收率在98.61%~100.80%之间,结果稳定、准确,可满足分析要求。

The manganese content of（wt）0.10%～2.0% in magnesium alloy has been determined by atom absorption spectrometry instead of the volumetric methods of sodium arsenite-sodium nitrite and the potassium periodate photometry.The experiment result shows that aluminum interferes obviously with the manganese determination while the aluminum content in the magnesium alloy is higher than（wt）0.5%（maximum is 9.1%）;the ammonium benzoate has been added to the medium of reducibility acetic acid,which created sediment of benzoic acid with aluminum ions;then the sediment was filtered and separated from the test solvent;a large number of interference of aluminum ions,which interfere with the determination of manganese,are eliminated.The recovery ratio can get to 98.61% to 100.80%.The result is stable and accurate,which can meet the requirement of analysis.