摘要
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%。
A method for determination of beryllium in sediments by graphite furnace atomic absorption spectroscopy is described. The sample is digested with mixed acids (HNO 3+HF) in a closed teflon crucible pot and heated in microwave oven. In the AAS determination aluminum nitrate solution (5g·L -1 ) is added as modifier. In the presence of Al 2O 3 and HF, the ashing temperature is raised to 1600°C, where the interference of HF is expelled. The method is fast and simple, and has high sensitivity and repeatability. The detection limit (3 S ) is 0 16ng·g -1 . The characteristic concentration is 0.73ng per 0.0044 A . When the beryllium concentration is 1.1μg·g -1 , the RSD obtained with 10 determination is 2.77%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2000年第11期493-494,497,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
铍
原子吸收光谱法
水系沉积物
痕量分析
Beryllium
Microwave digestion
Non flame atomic absorption spectroscopy constant temperature platform
