【作者】 赵志宾； 赵文霞； 张雷；

【Author】 ZHAO Zhi-bin, ZHAO Wen-xia, ZHANG Lei( Geophysical Exploration Department, CEEB, Baoding 071051, China; Hebei University of Science and Technology, Shijiazhuang 050018, China)

【机构】 中国冶勘总局地球物理勘查院环境工程研究所； 河北科技大学环境科学与工程学院；

【摘要】 研究并提出了将测定信号变化率的导数技术和浓缩待测原子的原子捕集技术与火焰原子吸收相联用于测定痕量镉的新技术。通过测定标准粉煤灰GBW08401和82201中痕量镉含量验证了该技术的可行性。与常规法相比,新方法的灵敏度和检出限可分别改善2-3个数量级和1-2个数量级(1-3分钟捕集条件下)。10次测定的相对偏差为6.26%-7.23%,回收率可达95%-104%。研究表明,此技术可成功地测定粉煤灰中的痕量镉。更多还原

【Abstract】 A new method, combination of derivative technique of determining change rate and trapping concentration of atom to be determined and the atomic absorption is proposed. The feasibility of the method was certified by determining trace cadmium in standard fly-ash (GBW08401 and 82201). Its sensitivity and detection limit are improved by 2-3 orders of magnitude and 1 - 2 orders of magnitude than those of troditional FAAS with 1 - 3 min collection time, respectively. The relative deviation is 6. 25%-7. 23% and recovery ratio reachs to 95% -104%. The results showe that this method is successfully applied to determination of trace heavy mental element-Cadmium in fly ash.更多还原