微波炉溶样恒温平台石墨炉原子吸收光谱法直接测定沉积物中痕量铍  

STPF-GFAAS DETERMINATION OF BERYLLIUM IN SEDIMENTS BY SAMPLE DIGESTION IN MICROWAVE OVEN

作　　者：李小英[1] 曾念华 罗方若[1] 刘容春 

机构地区：[1]地矿部成都综合岩矿测试中心，成都 610081 [2]西南石油地质局综合研究院实验室

出　　处：《理化检验（化学分册）》2000年第11期493-494,497,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

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%.

关 键 词：铍 原子吸收光谱法 水系沉积物 痕量分析 

分 类 号：O614.21[理学—无机化学] O657.31[理学—化学]