石墨炉原子吸收光谱法测定磷矿石中微量铅和铬  

Determination of Micro-amount of Lead and Chromium in Phosphate Ores by Graphite Furnace Atomic Absorption Spectrometry

作　　者：杨小丽[1,2] 王迪民[2] 汤志勇[1] 

机构地区：[1]中国地质大学材料科学与化学工程学院,湖北武汉430074 [2]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《岩矿测试》2010年第1期51-54,共4页Rock and Mineral Analysis

摘　　要：应用石墨炉原子吸收光谱法测定磷矿石中微量铅和铬，优化了仪器工作参数及石墨炉升温程序，探讨了不同酸溶体系、基体改进剂及共存元素的影响。方法检出限为铅0．25μg／g，铬0．29μ∥g；测定结果的相对标准偏差（RSD，凡=12）在2．2％～7．0％；加标回收率为93．2％～107．7％。方法灵敏度高，干扰少，操作简便，应用于磷矿石中微量铅、铬的测定获得了满意的结果。A method was established to determine the micro-amount of lead and chromium in phosphate ores by graphite furnace atomic absorption spectrometry. The instrument operating parameters and the furnace program were optimized. Some factors which affect the determination results, such as acid digestion system, matrix modifier and interference from concomitant elements were discussed. The detection limits of the method were 0.25 μg/g for lead and 0.29 μg/g for chromium. The recovery of the method was 93.2% - 107.7% with precision of 2.2% -7.0% RSD（n = 12）. The method has been applied to the determination of micro-amount of lead and chromium in phosphate ores with satisfactory results.

关 键 词：石墨炉原子吸收光谱法 磷矿石 铅 铬 

分 类 号：O657.31[理学—分析化学] P578.92[理学—化学]