摘要
目的建立检测米粉中镉含量的微波消解-石墨炉原子吸收光谱法,并对测定条件进行优化选择,达到快速、准确检测的目的。方法采用微波消解对米粉样品进行前处理,实验中以磷酸二氢铵为基体改进剂,通过优化灰化温度和原子化温度,在228.8 nm共振线,应用石墨炉原子吸收法测定米粉中镉的吸光度值,与标准系列比较定量。结果镉在0-4μg/L范围内线性关系良好,相关系数为0.999 1;最佳灰化温度为800℃,最佳原子化温度为1 200℃;方法检出限为0.065μg/L;精密度（RSD）为1.87%（n=6）;回收率为95.5%-104.0%。结论微波消解石墨炉原子吸收法具有操作简便、快速、灵敏度高等特点,并有较高的回收率,能适用于米粉中镉的测定。
Objective To develop a rapid and accurate detection method for the cadmium content in rice flour, and to optimize the conditions of the microwave digestion-graphite furnace atomic absorption spectrometry（GFAAS）. Methods Microwave digestion was used to pretreat rice noodle samples. In the experiment, ammonium dihydrogen phosphate was used as the matrix modifier. After optimizing of the ashing temperature and the atomization temperature, the absorbance of cadmium in rice flour was measured by GFAAS at 228.8 nm, compared with the standard series of quantitative. Results The absorbance of cadmium was in good linear at range of concentration 0-4 μg/L（r=0.999 1）. The best ashing temperature was 800 ℃, and the atomization was 1 200 ℃. The detection limit was 0.065 μg/L. The precision was 1.87%（n=6）; the recovery rate was 95.5%-104.0%. Conclusion Microwave digestion-GFAAS has the characteristics of simple operation, rapid, high sensitivity, and high recovery to the determination of cadmium in rice flour.
出处
《中国城乡企业卫生》
2016年第12期39-41,共3页
Chinese Journal of Urban and Rural Enterprise Hygiene
关键词
米粉
微波消解
石墨炉原子吸收
镉含量
Rice flour
Microwave digestion
Graphite furnace atomic absorption spectrometry（GFAAS）
Cadmium content
