Mihajlović Ljiljana, Nikolić-Mandić Snezana, Vukanović Branislav, Mihajlović Randel
Department of Chemistry, Faculty of Sciences, University of Kragujevac, Serbia.
Anal Sci. 2009 Mar;25(3):437-41. doi: 10.2116/analsci.25.437.
Natural monocrystalline pyrite as a new indicator electrode for the potentiometric titration of weak acids in acetonitrile, propionitrile and benzonitrile was studied. The investigated electrode showed a linear dynamic response for p-toluenesulfonic acid concentrations in the range from 0.1 to 0.001 M, with a Nernstian slope of 74 mV per decade. Sodium methylate, potassium hydroxide and tetrabutylammonium hydroxide (TBAH) proved to be very suitable titrating agent for this titration. The response time was less than (11 s) and the lifetime of the electrode is long. The advantages of the electrode are log-term stability, fast response, and reproducibility, while the sensor is easy to prepare and of low cost.
研究了天然单晶黄铁矿作为电位滴定乙腈、丙腈和苯腈中弱酸的新型指示电极。所研究的电极对对甲苯磺酸浓度在0.1至0.001 M范围内呈现线性动态响应，每十倍浓度变化的能斯特斜率为74 mV。甲醇钠、氢氧化钾和氢氧化四丁基铵（TBAH）被证明是该滴定非常合适的滴定剂。响应时间小于11秒，电极寿命长。该电极的优点是长期稳定性、快速响应和可重复性，同时该传感器易于制备且成本低。
