School of Applied Chemistry, Curtin University of Technology, GPO Box U 1987, Perth, Western Australia 6845, Australia.
Talanta. 2002 Apr 22;57(1):115-21. doi: 10.1016/s0039-9140(02)00003-6.
It is shown that the iron(III) chalcogenide glass membrane ion-selective electrode (ISE) can be calibrated in continuous flow analysis (CFA) using acidified iron(III) nitrate standards, yielding a 60+/-3 mV per decade change in activity of Fe(3+) response in the range 10(-7)-10(-2) M total iron(III). Extended ageing of the iron(III) ISE in 2 M zinc(II) sulphate did not alter the potentiometric response characteristics of the electrode. Furthermore, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy in the presence and absence of zinc(II) sulphate failed to detect a zinc(II) interference on the iron(III) ISE. CFA/ISE determined activities of Fe(3+) in synthetic zinc electrolyte containing 2x10(-3)-2x10(-1) M total iron(III) yielded results falling within +/-0.2logaFe(3+) unit of the corresponding iron speciation data calculated using the minteqa2 program.
研究表明，铁（III）硫属玻璃膜离子选择性电极（ISE）可以在连续流动分析（CFA）中使用酸化的硝酸铁标准进行校准，在 10（-7）-10（-2）M 总铁（III）范围内，铁（III）活性的每十年变化产生 60+/-3 mV 的响应。在 2 M 硫酸锌中延长铁（III）ISE 的老化时间不会改变电极的电位响应特性。此外，电化学阻抗谱和 X 射线光电子能谱在存在和不存在硫酸锌的情况下未能检测到锌（II）对铁（III）ISE 的干扰。CFA/ISE 测定含有 2x10（-3）-2x10（-1）M 总铁（III）的合成锌电解质中的 Fe（3+）活性，结果与使用 minteqa2 程序计算的相应铁形态数据的对应铁形态数据相差 +/-0.2logaFe（3+）单位。
