グラッシーカーボン電極を用いる鉛の高速掃引ストリッビングボルタンメトリー

概要

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Stripping voltammetry is one of the most sensitive methods to determine metal ions in natural waters. Usually mercury electrodes are employed as working electrodes. If electrodes as good as mercury electrodes are available, it is desirable to use them owing to the toxicity of mercury. Glassy carbon is considered to be a suitable alternative. In this report anodis stripping voltammetry of lead at a glassy carbon eletrode without and mercury coating was investigated. The effect of potential scan rate on stripping voltammograms was investigated from 5 to 9000 mV/s. It was found that 1000 mV/s gave the best results. The most suitable supporting electrolyte was 0.1 M HCl. The most suitable preconcentration time and preconcentration potential were 10 min and -0.8 V vs. SCE, respectively. The calibration curve was linear up to 0.1 mM lead. The detection limits were 20 nM (10 min preconcentration) and 8 nM (30 min preconcentration). The relative standard deviation was 5.87% at 50 nM Pb. Lead in a river water sample was determined to be 14 nM using the preconcentration by ion exchange resin.
社団法人日本分析化学会の論文
1991-09-05