微波消解-GFAAS法测定菠菜粉和蘑菇粉中微量镉的研究  

DETERMINATION OF CADMIUM CONTENT IN SPINAGE POWDER AND MUSHROOM POWDER BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY WITH MICROWAVE DIGESTION

作　　者：张玲帆[1] 陶卫[1] 张磊[1] 

机构地区：[1]华东理工大学分析测试中心,上海200237

出　　处：《化学分析计量》2010年第4期32-34,共3页Chemical Analysis And Meterage

摘　　要：应用微波消解-石墨炉原子吸收光谱法对菠菜粉和蘑菇粉中微量镉的含量进行测定。菠菜粉和蘑菇粉经HNO3＋H2O2微波消解体系消解后，采用磷酸二氢铵作为基体改进剂，灰化温度为900℃，原子化温度为1350℃，镉含量在0～2ng／mL范围内与吸光度呈线性关系，线性相关系数为0．9994，检出限为0．02mg／kg。该法测定结果的相对标准偏差小于4％（n=6），加标回收率为96．7％～103．2％。A method of graphite furnace atomic absorption spectrometry with microwave digestion was applied to determination of cadmium content in spinage powder and mushroom powder. The samples were digested by closed - vessel microwave HNO3 ＋ H2O2 digestion system. NH4H2PO4 was used as the matrix modifier. Ashing temperature and atomic temperature were 900℃, 1 350℃, respectively. The calibration curve was linear over the concentration ranges of 0 - 2 ng/mL with the correlation coefficient of 0. 999 4. The detection limit was 0. 166 ng/mL, and the relative standard deviations （RSDs） were no more than 4%. Recovery of spiked samples was 96.7% - 103.2%.

关 键 词：微波消解 石墨炉原子吸收光谱法 菠菜粉 蘑菇粉 镉 

分 类 号：O657.31[理学—分析化学]