微波消解-ICP-AES法测定蔬菜中重金属含量

Determination of Heavy Metals in Vegetables by Microwave Digestion/Inductively Coupled Plasma Atomic Emission Spectroscopy

采用微波消解处理样品,以电感耦合等离子体发射光谱(ICP-AES)法测定8种蔬菜中的Zn、Pb、Cu、Cd4种重金属元素的含量。结果表明:此方法的检出限为0.006～0.018μg/mL,相对标准偏差0.17%～1.76%,加标回收率为99.00%～102.95%。叶类蔬菜吸收重金属的能力比茄果类蔬菜强。ICP-AES法测定蔬菜中重金属元素的含量具有快速、灵敏、准确性较好的优点。

A microwave digestion/inductively coupled plasma atomic emission spectroscopy （ICP-AES） method was presented for the determinations of Zn,Pb,Cu and Cd in vegetables. The detection limits of the method for the elements varied from 0.006 to 0.018 mg/L,with relative standard deviations between 0.17% and1.76%,and the spike recovery ratios for them were in the range from 99.00% to 102.95%. The actual applications demonstrate that this method is sensitive,and that the leaf vegetables can adsorb more heavy metals than fruit vegetables such as eggplant.