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研究了家用微波炉在自制的聚四氟乙烯密闭容器内 ,混酸 (HNO32 ml、HF2 ml)分解样品 ,5g·L-1Al(NO3) 3作改进剂 ,直接定容后 ,在大量氢氟酸存在下 ,恒温平台石墨炉 (STPF)原子吸收光谱法测定水系沉积物中痕量铍。Al(NO3) 3的存在 ,将铍的灰化温度提高到 1 60 0°C,且消除溶解所引入的大量剩余氢氟酸干扰。方法快速、简捷 ,灵敏度高 ,再现性好 ,其检出限 (3S)为 0 .1 6ng· g-1,铍的特征质量为 0 .73ng/0 .0 0 4 4 A,铍含量为 1 .1μg· g-1的样品 ,取 1 0份同时测定 ,平均值为 1 .1 6μg·g-1,相对标准偏差为 2 .77%。
In a home-made polytetrafluoroethylene (PTFE) airtight container, mixed samples of HNO32, HF2 ml were decomposed and 5g · L-1Al (NO3) 3 was used as a modifier. Determination of Trace Beryllium in Water Sediment by Constant Temperature Platform Graphite Furnace (STPF) Atomic Absorption Spectrometry. The presence of Al (NO3) 3 raises beryllium ashing temperature to 1660 ° C and eliminates the large amount of residual hydrofluoric acid interference introduced by dissolution. The method has the advantages of fast, simple, high sensitivity and good reproducibility. The detection limit (3S) is 0.16ng · g-1, the characteristic mass of beryllium is 0.73ng / 0.0404A, the content of beryllium is 1 .1μg · g-1 samples taken 10 simultaneous determination, with an average value of 1.16μg · g-1, the relative standard deviation of 2.77%.