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无火焰原子吸收光度法测定生物材料,燃料,岩石中铍,已有报导。但当试样成份复杂,有基体干扰时往往需预先分离处理。本文利用基体改进剂(MM)消除铝、钙、镁、钠、铁基体干扰,直接用石墨炉原子吸收测定地球化学试样中0.16ppm(2δ)以上铍的含量,方法绝对灵敏,度为4.3×10~(13)g铍,相对标准偏差(RSD)2.88％,标准加入回收率95—110％。方法简便快速,与地球化学标准参考。样结果吻合,满足了地球化学研究要求。
Flameless atomic absorption spectrophotometry for the determination of beryllium in biological materials, fuels and rocks has been reported. But when the sample composition is complex, there is often the need to pre-separation matrix interference. In this paper, the interference of aluminum, calcium, magnesium, sodium and iron was eliminated by matrix modifier (MM). The content of beryllium above 0.16ppm (2δ) in geochemical samples was directly determined by graphite furnace atomic absorption spectrometry. The method was absolutely sensitive with a degree of 4.3 × 10 ~ (13) g beryllium, the relative standard deviation (RSD) of 2.88%, standard addition recovery of 95-110%. The method is simple and quick, with reference to geochemical standards. The results are in good agreement with the requirements of geochemical research.