小麦粉中重金属镉含量的测定能力验证结果分析

Analysis of proficiency testing results of the detection ability of heavy metal cadmium content in wheat flour

目的提升实验室对食品中重金属镉的检测能力。方法实验室参加CFAPA-1743小麦粉中镉和铬含量的测定能力验证活动。针对能力验证样品小麦粉,采用湿法消解的方法对样品进行制备,最后用石墨炉原子吸收光谱法(graphite furnace atomic absorption spectroscopy,GFAAS)检测。结果137号和238号样品中镉的含量分别为0.2380 mg/kg和0.1112 mg/kg,Z值分别为0.36和0.24,结果均为满意。结论实验室顺利通过本次能力验证,检测能力得到提高,为其他重金属的能力验证提供参照。

Objective To improve the laboratory’s ability to determinate heavy metal cadmium in food.Methods The laboratory participated in the capability verification of CFAPA-1743 determination of cadmium and chromium in wheat flour.According to the capability verification samples wheat flour,the samples were prepared by wet digestion method,and finally detected by graphite furnace atomic absorption spectroscopy(GFAAS).Results The content of cadmium in samples 137 and 238 was 0.2380 mg/kg and 0.1112 mg/kg,respectively,and the Z value was 0.36 and 0.24,respectively.The results were satisfactory.Conclusion The laboratory successfully passes this capability verification,and the detection capacity is improved,which provides reference for other heavy metal capability verification.