石墨炉原子吸收光谱法测定磷矿石中微量镉干扰的抑制

Control of interference for the determination of trace cadmium in phosphate rock by graphite furnace atomic absorption spectrometry

研究了石墨炉原子吸收法测定磷矿石中微量镉的多种干扰作用。探讨了分子吸收、基体效应和共存元素的干扰 ,考察了载气流速和积分方式的影响 ,进行了干扰抑制试验 ,提出了减少干扰的有效方法 ,采用最优方式对磷矿石中微量镉进行测定 。

An anti-interference method is studied for the determination of trace cadmium in phosphate rock by graphite furnace atomic absorption spectrometry. All kinds of effects for example,molecule absorption,matrix,coexisting elements,flow rate of carrier gas,integrate model and so on are discussed and eliminated. Matrix matching is used as the preparation of working curve. The interference of background is efficiently eliminated. The relative standard deviation is less than 17.4%. Recovery of standard addition is satisfactry.