原子荧光光谱法测定植物样品中痕量镉的含量

建立微波消解-原子荧光光谱法测定植物样品中的镉含量的方法。用微波消解仪器对植物样品进行消解,在最佳仪器反应条件下,测定植物样品中镉的含量。镉浓度为0.1~0.8 ng/mL时荧光强度与镉浓度呈显著的线性关系,r=0.9995,方法的检出限为0.0018 ng/mL。向植物样品中分别添加一定浓度的镉,3个样品的回收率在90.4%~92.1%之间。方法的精密度为1.64%。该方法简便、快速,有较高的灵敏度、准确度、精密度和较低的检出限,适合植物样品中镉含量的测定。

Determination of trace amounts of cadmium in a plant sample by atomic fluorescence spectrometry

To establish a method for the determination of cadmium in plant material by Atomic Fluorescence Spectrometry using microwave digestion. Under the proposed conditions, determine cadmium in plant material using microwave digestion. The results showed that the significant linear relations between Cd concentration and fluorescence intension in the range of 0. 1 -0. 8 ng/mL, r =0. 9995. The detection limit was 0. 0018 ng/mL. The average recovery rates were in the range of 90. 4% -92. 1% ,when plant samples were added with cadmium. The RSD for cadmium was 1.64%. This method is simple, rapid, high sensitivity, accurate, precision and low detection limits. And it suits the purpose of the determination for cadmium in plant material.