石墨炉原子吸收光谱法测定新疆出口番茄酱中的铅和镉

Determination of Lead and Cadmium Contents in Output Tomato Ketchup in XinJiang by Graphite Furnace Atomic Absorption Spectrometry

报道了微波消解石墨炉原子吸收光谱法测定番茄酱中的铅、镉.研究了石墨炉原子吸收测定的最佳条件.该方法测定铅和镉的线性范围分别为0.00～25 ng/mL、0.00～8 ng/mL;相对标准偏差分别为2.15%、3.10%;回收率分别为98.6%、104.5%.利用国家标准物质番茄叶（ESP-1）验证了方法的准确度,测定值与标准值基本吻合.研究表明,该方法具有很好的准确度和精密度.

The samples were digested by microwave and determined by Graphite Furnace Atomic Absorption Spectrometry. The optimal conditions for determination of Pb,Cd in tomato ketchup was investigated and established. Linear scope for Pb is 0.00-25 ng/mL and for Cd is 0.00-8 ng/mL. The relative standard deviations of Pb and Cd were 2.15% and 3.10%, respectively. Recoveries for Pb and Cd are 98.6% and 104.5%. The accuracy and precision of the method was determined by using standard reference sample of tomato leaves（ESP-1）. And the results abtained were in good agreement with the certified values.