电感耦合等离子体原子发射光谱法(ICP-AES)测定5XXX系铝合金中的高镁含量

采用电感耦合等离子体原子发射光谱法测定5XXX系铝合金中的高镁含量,选择20mL稀王水溶液溶解试样,以消除合金中的基体元素及其它共存元素的干扰为目标,选择测定镁含量的分析谱线为280.270nm。分别称取与分析试样基体近似的三种铝合金标准物质0.100 0g,按试样相同的溶解方法处理并定容至100mL,选择仪器工作条件,制作分析曲线,进行曲线校准,按照同样的方法对4个样品各测定6次,测定值的相对标准偏差均不大于0.59%,用标准加入法测得加标回收率在94.0%~104.0%,测定值和环己二胺四乙酸分离络合滴定法测定的5XXX系铝合金中的镁量结果一致。

Determination of Magnesia in 5 XXX Series Al Alloy by Inductively Coupled Plasma Atomic Emission Spectrometry

In the present paper, the content of magnesia in 5 XXX series aluminum alloy was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) . The sample was digested by 20 mL dilute aqua regia medium to overcome the interference of matrix elements and other coexisting elements in the alloy then the content of magnesium was measured by ICP-AES at 280.270 nm as analytical spectral line . Three kinds of aluminum alloy standard materials, as well as the sample (with the similar matrix) were weighed to 0.100 0g for digestion, then the digestion solutions was kept at 100 mL. Instruments operating parameters were studied and calibration curves were made. The above-mentioned four samples were determined six times, respectively. The relative standard deviations (RSDs) were less than 0.59%.The recovery was in the range of 94.0%~104.0%. The measured values of magnesia obtained by the proposed method in 5 XXX series aluminum alloy were consistent with those obtained by 1, 2-diaminocyclohexane tetraacetic acid separation and complexmetric titration method.