Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
Drug Test Anal. 2012 Dec;4(12):1009-13. doi: 10.1002/dta.366. Epub 2011 Oct 13.
The construction and electrochemical response characteristics of a screen-printed electrode (SPE) for the determination of dodecyltrimethylammonium bromide (DTAB) are described. The sensor was based on the use of DTA-tetraphenylborate ion association complex as an electroactive material in screen-printed electrode with dioctylsebacate (DOS) as a solvent mediator. In aqueous solution of pH 3, the sensor displayed a stable response for six months with reproducible potential and linear response for surfactant over the concentration range 1.20 × 10(-2) -5.6 × 10(-7) mol L(-1) at 25 °C with Nernstian slope of 55.95 ± 0.58 mV decade(-1) for detection limit of 6.8 x 10(-6) mol L(-1) . The response time was 6-10 s. The selectivity coefficients indicate excellent selectivity for DTAB over many common cations (e.g. Mg(2+), Na(+), K+, Co(2+), Ni(2+), Ca(2+), Cl(-), I(-), SO(4)(-2) and cetylpyridinium chloride (CPC). The sensor was used successfully for the determining of DTAB in pure form and water samples with average recoveries of 99.98, 98.78, and 99.99%.
本文描述了一种用于测定十二烷基三甲基溴化铵（DTAB）的丝网印刷电极（SPE）的构建和电化学响应特性。该传感器基于使用 DTA-四苯硼酸盐离子缔合配合物作为电活性物质，在含有二酸二辛酯（DOS）的丝网印刷电极中作为溶剂介导物。在 pH 3 的水溶液中，该传感器在 25°C 下，在 1.20×10(-2) -5.6×10(-7) mol L(-1)的浓度范围内对表面活性剂表现出稳定的响应，重现性好，电位和线性响应，Nernst 斜率为 55.95±0.58 mV decade(-1)，检测限为 6.8 x 10(-6) mol L(-1)。响应时间为 6-10 s。选择性系数表明，该传感器对 DTAB 具有优异的选择性，优于许多常见阳离子（如 Mg(2+)、Na(+)、K+、Co(2+)、Ni(2+)、Ca(2+)、Cl(-)、I(-)、SO(4)(-2)和十六烷基吡啶氯盐（CPC）。该传感器成功用于纯 DTAB 和水样中 DTAB 的测定，平均回收率为 99.98%、98.78%和 99.99%。
