磷酸二氢铵作为基体改进剂石墨炉原子吸收法测定蔬菜中镉

Determiantion of cadmium in vegetable by graphite furnace atomic absorption spectrophotometry with diammonium phosphate as a matrix modifier

目的：本文探讨了用磷酸二氢铵作为基体改进剂,石墨炉原子吸收法测定蔬菜中镉的方法。方法：样品采用湿法消解,以磷酸二氢铵作为基体改进剂,采用塞曼扣背景,石墨炉原子吸收法进行镉含量测定。结果：磷酸二氢铵作基体改进剂具有很好的灵敏度,试验的精密度为5.2%～8.3%,回收率为91.0%～97.4%,检测限为0.24μg/L。结论：本方法具灵敏度高,检出限低,共存干扰少,方法快速等特点,适用于大量样品的测定。

Objective：In this paper,a method is described for the determination of Cd in vegetable by GFAAS with diammonium phosphate（DAP） as a Matrix modifier.Methods：Sample was pretreated by wet digestion,then Cd was determined using Zeeman GFAAS.Results：The limits detection of Cd was 0.24 μg/L,the precision was fine RSD8.3%,the recovery was 91.0%～97.4%.Conclusion：This method has low detection limit,is simple,accurate and it is suitable for daily detection of large number of samples.