摘要
利用线性扫描伏安法,通过单因素实验,研究了变压器油中T501抗氧化剂的电化学特性。并结合密度泛函理论对其进行了分析探讨,优化了实验条件,如：工作电极的材料和大小、电解质溶液的组成和浓度等;确定了实验的最佳条件：直径6mm石墨电极为工作电极,KOH-乙醇溶液（KOH浓度0.15 mol/L,含水量的体积分数1%）为电解质溶液,进而建立了一种快速准确的测定变压器油中T501抗氧化剂含量的新方法。研究结果表明,在优化条件下,在变压器油T501使用浓度范围内（质量分数0.05%~0.50%）,T501浓度C与峰电流Ip（μA）之间呈现良好的线性关系,检出限（S/N=3）为0.045%,回收率为98.67%~102.00%。本方法具有较高可靠性和实用性,在保证准确性的前提下,大大提高了变压器油中T501含量测定的效率。
Abstract： The electrochemical properties of T501 antioxidant in transformer oil were inves- tigated comprehensively by using linear sweep voltammetry（LSV） and single factor exper- ira, and analyzed by combining density functional theory（DFT） calculations. The experi- mental conditions were optimized, such as the material and size of working electrode, the composition and concentration of electrolyte solution. The best experimental conditions were determined, the working electrode was a 6 mm-diameter graphite electrode electrode, the alcoholic KOH solutions were used as electrolytes, and the concentrations of KOH were controlled to be 0.15 mol/L, the water content（volume fraction） was controlled to be 1%. A new method was established to detect the T501 antioxidant content in transformer oil rapidly and accurately. The results showed that there was a good linear relationship between the oxidation peak current Ip （μA） and the concentration（mass fraction） of T501 antioxi- dant in transformer oil among 0.05%-0.50% under the optimal conditions. The detectionlimit （S/N=3） was 0.045%, and the standard addition recovery was 98.67%-102.00%. This method was of high reliability and practicability, and greatly improved the efficiency of the determination of T501 content in transformer oil on the premise of the accuracy.
出处
《长沙理工大学学报（自然科学版）》
CAS
2015年第2期83-89,共7页
Journal of Changsha University of Science and Technology:Natural Science
基金
湖南省科技计划重点项目(2013GK2006)
广西电网公司科研项目(K-GX2013-117)
关键词
变压器油
抗氧化剂
线性扫描伏安法
条件优化
密度泛函理论
transformer oil
antioxidant
linear sweep voltammetry
conditions optimiza-tion
density functional theory
