催化示波极谱法测定农作物中的微量铅

Catalytic wave oscillopolarographic determination of traces of lead in crops

1 前言 农作物中铅的含量在很大程度上反映出土壤和成土母岩中铅的水平。铅是一种有毒元素,人体摄入过量的铅,就会导致一系列的病变。因此,农作物中铅的测定对调查和评价环境中铅的污染,估算人畜食入铅的量,研究各类因铅中毒引起的疾病,做到对症下药具有十分重要的意义。

A sensitive polarographic catalytic wave system (Pb-0.24M HCl-0.6% NaAc-0.4% KI--0.4% ascorbic acid) for determining traces of lead in crops was proposed. The peak potential is-0.34V (vs. S. C. E.). The wave for the determination of lead within the range of 0—30μg/25ml is available. The detection limit of Pb is 0.002μg/ml. Eighteen metal ions and acid radicals are not interferential. The waves are clear and steady. The recovery is 92.6—107% and the variation coefficient is less than 3.41%.