世界核地质科学2025，Vol.42Issue(3)：647-658,667,13.DOI:10.3969/j.issn.1672-0636.2025.03.015
电位落差法测定铀矿地质样品的氧化-还原电位
Determination of redox potential of uranium geological samples by potential difference method
摘要
Abstract
To accurately measure the oxidation-reduction potential of uranium ore geological samples,this study try to explore a better measurement method and experimental conditions by comparing and analyzing the application effects of the acidic potassium dichromate method and the alkaline potassium permanganate method in the measurement of the oxidation-reduction potential of uranium ore geological samples.The potential drop method was used to systematically conduct a multi-dimensional comparison between the acidic potassium dichromate method and the alkaline potassium permanganate method.The aspects of comparison included solution stability,optimal solution concentration,sample soaking time,solid-liquid ratio,and electrode equilibrium time.The sample soaking time and electrode equilibrium time of the alkaline potassium permanganate method are shorter than those of the acidic potassium dichromate method,allowing it to reach a stable and reliable potential value more quickly.For strongly reducing samples,the ΔEh value obtained by the acidic potassium dichromate method is larger.However,the evaluation conclusions of the two methods regarding the reduction ability of the samples are consistent.Nevertheless,the precision of the alkaline potassium permanganate method is better.The optimal experimental conditions for the alkaline potassium permanganate method are as follows:a concentration of 0.03 mol∙L-1,a sample soaking time of 1.5 h,a solid-liquid ratio of 1:25,an electrode equilibrium time of 5 min,a reaction medium of 0.2%potassium hydroxide solution,and a temperature of(25±1)℃.The ΔEh value measured by this method is basically consistent with the judgment results of the oxidation-reduction environment by the oxidation coefficient method(Fe2+/Fe3+),and is also basically consistent with the color of the samples.Based on comprehensive experimental indicators,the overall performance of the alkaline potassium permanganate method is superior to that of the acidic potassium dichromate method in the measurement of the oxidation-reduction potential of uranium ore geological samples.By adopting the optimal experimental conditions,the accurate measurement of the oxidation-reduction potential of uranium geological samples is achieved,providing reliable technical support for uranium ore geological research.关键词
电位落差法/氧化-还原电位/碱性高锰酸钾/酸性重铬酸钾/铀矿地质样品Key words
potential drop method/redox potential/potassium permanganate/potassium dichromate/geological samples of uranium ore分类
化学化工引用本文复制引用
张建梅,邓长生,乔浩..电位落差法测定铀矿地质样品的氧化-还原电位[J].世界核地质科学,2025,42(3):647-658,667,13.基金项目
中国核工业地质局项目"新疆察布查尔县都拉塔地区铀矿普查(编号:202305-1)"资助 Supported by Uranium Investigation Project of China Nuclear Geology"Uranium mineral survey in Dulaota area,Chapchar County,Xinjiang(No.202305-1)" （编号:202305-1）
