火焰原子吸收法测定锌铝镁稀土合金中镁元素

Determination of magnesium element in Zn-Al-Mg rare earth alloy by flame atomic absorption method

目前国内锌基合金中的镁含量为1%~5%,此范围镁含量的测定还没有相关标准方法,有些厂家采用ICP方法进行测试,但存在两个问题:一方面这种方法不是国家标准方法,另一方面ICP仪器价格昂贵,不适用于每个生产企业。中冶葫芦岛有色金属集团有限公司开发了火焰原子吸收光谱仪测定锌铝镁稀土合金中镁的方法,该方法具有操作简单、精度好、成本低、速度快的优点,而且考虑了共存元素的干扰,选择氯化锶做消除剂,镁的测定范围是0.5%~5%,样品回收率达到98%以上。本文通过加标和精密度试验,对该方法进行阐述和分析。

Currently,magnesium content in the zinc-based alloy in China is 1% to 5%,and in this range,the determination of magnesium content lacks relevant standards and methods. Some manufacturers adopt ICP method for determination,yet there are two problems. On the one hand,ICP method isn’t a national standard method;on the other hand,ICP instrument is expensive and not applicable to every production enterprise. MCC Huludao Nonferrous Metals Group Co.,Ltd. has developed a method of using flame atomic absorption spectrometer to determine magnesium content in Zn-Al-Mg rare earth alloy,characterized by the advantages of simple operation,good precision,low cost and fast speed. And this method considers the interference of coexistent elements and select strontium chloride as the remover,with the determination range of magnesium as 0. 5% to 5% and sample recovery rate over 98%. This method is illustrated and analyzed in this paper through addition of reference material and precision test.