微波消解—石墨炉原子吸收光谱法测定蔬菜中的微量镉

Determination of cadmium in vegetables by GFAAS with microwave digestion

目的：建立微波消解—石墨炉原子吸收光谱法,用于蔬菜中微量镉的测定。方法：选择最优的微波消解条件进行消解,采用磷酸二氢铵作为基体改进剂,用石墨炉原子吸收光谱法进行蔬菜中镉含量的测定。结果：在优化的最佳消解条件和仪器检测条件下,方法具有很好的准确度和灵敏度,试验的RSD为2.4%~4.0%,回收率为95.8%~99.1%,检出限为0.010μg/L。结论：方法具有灵敏度高、稳定性好、检出限低、回收率高等特点,能满足蔬菜中镉含量的测定。

Objective： To establish a method by GFAAS with microwave digestion, used for the determination of trace cadmium in vegetables. Methods： Select the optimal conditions of microwave digestion, using ammonium dihydrogen phosphate as matrix modifier, by graphite furnace atomic absorption spectrometry to determine the content of cadmium in vegetables. Results： In the optimization of the optimum digestion conditions and instrument testing conditions, this method has good accuracy and sensitivity, the RSD was 2.4 % - 4.0 %, the recovery was 95.8 % - 95.8 %, the detection limitof this method was 0.010 tag/L. Conclusion： There are ttraits of high sensitivity, good stability, low detection limit, high recovery rate for this method, it can satisfy the determination of cadmium content in vegetables.