微波消解-石墨炉原子吸收法测定食品中铅、镉和铜

目的建立微波消解-石墨炉原子吸收法测定食品中铅、镉和铜的方法。方法食品样品经微波消解后,用石墨炉原子吸收法测定食品中铅、镉和铜的浓度。结果本法在铅浓度为0μg/L～20μg/L、镉浓度为0μg/L～2μg/L、铜浓度为0mg/L～0.1mg/L,范围有良好的线性关系,相关系数:rPb=0.9 995,rCd=0.9 998,rCu=0.9 992;检出限为:Pb:0.005mg/kg,Cd:0.0 003mg/kg,Cu:0.08mg/kg;相对标准偏差为Pb:2.3%,Cd:1.2%,Cu:0.92%;回收率为Pb:88.5%～93.5%,Cd:92.0%～96.8%,Cu:93.3%～97.6%。结论该方法具有简便、快速、准确等优点,适合日常批量检测。

Determination of lead,cadmium and copper in food by microwave digestion graphite furnace atomic absorption spectrometry

Objective To establish microwave digestion graphite furnace atomic absorption spectrometry method for determination lead,cadmium and copper in food.Method The food was dissolved by microwave digestion and then Pb,Cd and Cu in food were determined by graphite furnace atomic absorption spectrometry.Results This method had good linear relation at the density range of Pb 0μg/L to 20μg/L,Cd 0μg/L to 2μg/L and Cu 0mg/L to 0.1mg/L,correlation coefficient were rPb=0.9995,rCd=0.9998,rCu=0.9992,the detection limit were that Pb 0.005mg/kg,Cd 0.0003 mg/kg,Cu 0.08 mg/kg,with the relative standard deviation was that Pb 2.3%,Cd 1.2%,Cu 0.92%.The coefficient of recovery was that Pb 88.5%~93.5%,Cd 92.0%~96.8%,Cu 93.3%~97.6%.Conclusions The method is simple and rapid and accurate,it is suitable for daily determination.