Z-5000石墨炉原子吸收光谱法测定痕量金检出限的探讨

Study on the Detection Limit of Determination of Trace Gold by Z-5000 Graphite Furnace Atomic Absorption Spectrometry

以泡沫塑料富集分离—石墨炉测定痕量金为例,讨论了检出限测定过程中空白试剂的选择及测定,并通过测定方法的改进来提高石墨炉原子吸收测定痕量金的检出限。从检测结果来看,试剂空白计算得到的检出限只代表仪器的检测能力,而真实空白得到的检测限才能体现出方法的真实检出限。研究结果表明,通过加入抗坏血酸和增加进样可有效提高泡沫塑料富集分离—石墨炉测定痕量金的检出限。

We discuss the process of detection limit and how to choose the reagent blank and improve the detection limit by taking determination of trace gold using foam separation enrichment-Graphite Furnace Atomic Absorption as an example. The results show that the detection limit calculated from reagent blank can only represent the instrument detection, but real blank can reflect the true method detection limit which is used in this study, and the detection limit of trace gold determination by Foam Separation Enrichment-Graphite Furnace Atomic Absorption can be effectively improved by adding ascorbic acid or increasing the injection.