Electrochemical characterization and analytical application of arsenopyrite mineral in non-aqueous solutions by voltammetry and potentiometry
Electrochemical characterization and analytical application of arsenopyrite mineral in non-aqueous solutions by voltammetry and potentiometry
复制标题
DOI：
10.1016/j.poly.2010.12.009
复制
发表时间：
2011-03
期刊：
影响因子：
2.6
通讯作者：
Z. Stanić;Tijana Dimić;Z. Simic;L. Jakšić;S. Girousi
中科院分区：
文献类型：
--
作者：
Z. Stanić;Tijana Dimić;Z. Simic;L. Jakšić;S. Girousi
基于循环伏安法，本文采用碳糊对非水溶液中毒砂矿物进行了表征。毒砂产生明确的循环伏安响应与明确的氧化（在电位范围从-0.7至0.7V，相对于Ag/AgCl）和还原（从-1.0至0.8V）峰使用该电极。此外，还研究了毒砂矿物作为一种新的指示电极，用于乙腈和丙腈中酸（苯甲酸、邻氨基苯甲酸和水杨酸）和碱（N，N′-二苯胍、三丁胺和可力丁）的电位滴定。氢氧化钾，四丁基氢氧化铵（TBAH）和高氯酸被证明是非常合适的滴定剂，这些滴定。该电极对甲苯磺酸的浓度在0.1-0.001M范围内呈线性动态响应，能斯特斜率在乙腈中为38.5mV，在丙腈中为44.6mV。该电极显示出相对快的响应时间，并且可以在没有任何时间限制或没有相当大的电位偏差的情况下使用。电极在两种溶剂中的响应时间均小于10 s。测定的标准偏差小于0.6%，从那些获得与玻璃电极的酸和碱。电极的优点是长期稳定性，快速响应和重现性，而传感器易于制备，成本低。
Based on the cyclic voltammetric method, in the present study we have employed carbon paste for arsenopyrite mineral characterization in non-aqueous solution. Arsenopyrite yields well-defined cyclic voltammetric responses with well-defined oxidation (in the potential region from −0.7 to 0.7V, versus Ag/AgCl) and reduction (from −1.0 to 0.8V) peaks using this electrode. In addition, arsenopyrite mineral was studied as a new indicator electrode for the potentiometric titrations of acids (benzoic, anthranilic and salicylic acids) and bases (N,N′-diphenylguanidine, tributylamine and collidine) in acetonitrile and propionitrile. Potassium hydroxide, tetrabutylammonium hydroxide (TBAH) and perchloric acid proved to be very suitable titrating agents for these titrations. The investigated electrode showed a linear dynamic response for p-toluenesulfonic acid concentrations in the range 0.1–0.001M, with a Nernstian slope of 38.5mV in acetonitrile and 44.6mV in propionitrile. The electrode showed a relatively fast response time and can be used without any time limit or without considerable divergence in potentials. The response time of the electrode was less than 10s in both solvents. The standard deviation of the determination of the investigated acids and bases was less than 0.6% from those obtained with a glass electrode. The advantages of the electrodes are long-term stability, fast response and reproducibility, while the sensors are easy to prepare and are of low cost.