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采用探针恒温原子化技术的石墨炉原子吸收 ,测定高纯金属镁中的痕量铝 ,利用样品中的基体镁转化成硝酸镁成为一种有效基体改进剂 ,进一步改善了铝的分析性能。实验优化了仪器条件和分析方法。结果表明 ,在有Mg(NO3) 2 存在时 ,可显著提高探针原子化测铝的灰化温度 ,降低原子化温度 ,并且使铝的灵敏度提高了 50 %。方法的检出限为 2 .2× 1 0 - 1 1 gAl,测定 50 μg/LAl标准溶液的相对标准偏差 (n =1 2 )为 3.1 %。用该法测定了 4个金属镁内部管理样品中Al的含量 ,结果与推荐值相符合 ,其RSD(n =6)为 3.4%～ 1 1 .0 %。
Graphite Furnace Atomic Absorption Spectrometry with Probe Constant Temperature Atomic Absorption was used to determine trace aluminum in high purity metallic magnesium. The conversion of matrix magnesium in the sample to magnesium nitrate became an effective matrix modifier to further improve the analytical performance of aluminum. Experiment optimized instrument conditions and analytical methods. The results show that in the presence of Mg (NO3) 2, the atomization temperature of the probe can be markedly increased, the atomization temperature can be reduced, and the sensitivity of aluminum can be increased by 50%. The detection limit of the method was 2.2 × 10 11 - 1 g Al, and the relative standard deviation (n = 12) of the 50 μg / LAl standard solution was 3.1%. The content of Al in four MgO samples was determined by this method. The results were consistent with the recommended values, and the RSD (n = 6) was 3.4% ~ 1.1%.