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采用样品中加入硝酸镁和抗坏血酸作为混合基体改进剂 ,塞曼石墨炉原子吸收光谱法测定氧化铍中痕量铅 ,确定了仪器的工作条件 ,并实现了无标准测定。测定的相对标准偏差不大于 5 % ,用标准加入法测定铅的回收率为 82 %— 1 1 4%。
Magnesium nitrate and ascorbic acid were used as modifier in the sample. Zeeman graphite furnace atomic absorption spectrometry was used to determine the amount of trace lead in beryllium oxide. The working conditions of the instrument were determined and no standard determination was achieved. The relative standard deviation of the determination was not more than 5%, and the lead recovery was 82% - 114% by standard addition method.