Department of Analytical and Organic Chemistry, University Rovira i Virgili, Campus Sescelades, Marcel.lí Domingo s/n, 43007, Tarragona, Catalonia, Spain.
Analyst. 2009 Sep;134(9):1905-10. doi: 10.1039/b908224g. Epub 2009 Jul 15.
A solid contact ion-selective electrode using for the first time multi-walled carbon nanotubes (MWCNT) for the transducer material was developed for detecting perchlorate in water. To demonstrate the excellent ion-to electron transducer ability of the MWCNTs, a 15 microm thick layer of carboxylated MWCNT was deposited between an acrylic membrane selective to perchlorate ions and a glassy carbon rod used as the substrate and electrical conductor. The electrodes showed a Nernstian response of 57 mV decade(-1) (standard deviation of 3 mV decade(-1) over time and different electrodes) across a wide linear range of 10(-6) to 10(-2) M. The limit of detection was 10(-7.4) M of perchlorate. The response time was less than 10 s for activities higher than 10(-6) M and the intermediate-term potential stability shows a small drift of 0.22 mV h(-1) recorded over 5 hours. The electrode displays a selectivity comparable to liquid-contacted ISEs containing the same membrane.
一种基于多壁碳纳米管（MWCNT）的固态接触式离子选择性电极首次被用于检测水中的高氯酸盐。为了证明 MWCNTs 具有优异的离子-电子转换能力，在对高氯酸盐有选择性的丙烯酸膜和作为基底及电导体的玻碳棒之间沉积了一层 15 微米厚的羧基化 MWCNT。该电极在 10(-6) 到 10(-2) M 的宽线性范围内表现出 57 mV 每 decade(-1)（随时间和不同电极变化的标准偏差为 3 mV decade(-1)）的能斯特响应。高氯酸盐的检测限为 10(-7.4) M。对于高于 10(-6) M 的活度，响应时间小于 10 s，中期电位稳定性显示出在 5 小时内记录的 0.22 mV h(-1)的小漂移。该电极显示出与含有相同膜的液接触 ISE 相当的选择性。
