固体进样—石墨炉原子吸收法测定沙棘维生素P粉中镉含量的研究

本研究采用直接固体进样-石墨炉原子吸收法(SS-GF AAS)测定沙棘维生素P粉中重金属镉的含量。通过对石墨炉工作程序的优化,同时采用了基体改进剂技术,最终得到稳定而准确的结果,其结果与液体进样使用ICP-MS测量结果一致。本方法中RSD在6.08%～11.42%之间,回收率在90.75%～105.63%之间,检出限为0.0034ng。与湿法消解方法相比较,该方法无需样品前处理,具有简便、快速特点,同时可避免样品的稀释以及试剂的交叉污染带来的分析误差。

Determination of Cd in Seabuckthorn Vitamin P Powder by Graphite Furnace Atomic Absorption Spectrometry Using Solid Sampling

Direct solid sampling graphite furnace atomic absorption spectrometry(SS-GF AAS) was used to determine Cd in Vitamin P sea-buckthorn powder.After the program optimization and with an extremely careful selection of chemical modifier,the stable and accurate results could be obtained.The same results could finally be carried out by ICPMS using liquid sampling.The RSD was between 6.08%~11.42%,the recovery rate was between 90.08%~113.63%,the detection limit was 0.0034ng.Compared with liquid sampling graphite furnace AAS analysis,the Direct SS-GF AAS proved to be a good alternative to conventional methods of trace analysis after wet-chemical digestion and compared favorably with these methods.It can save a lot of work for sample processing,has benefits to avoid dilution and external contamination.