Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, India.
Talanta. 2003 Jan 2;59(1):101-5. doi: 10.1016/s0039-9140(02)00473-3.
A new ion-selective PVC membrane electrode based on salicylaldehyde thiosemicarbazone as an ionophore is developed successfully as sensor for mercury(II) ions. The electrode shows excellent potentiometric response characteristics and displays a linear log[Hg(2+)] versus EMF response over a wide concentration range of 1.778x10(-6)-1.0x10(-1) M with Nernstian slope of 29 mV per decade with the detection limit of 1.0x10(-6) M. The response time of the electrode is less than 30 s and the membrane electrode operates well in the pH range of 1.0-3.0. The lifetime of the sensor is about 2 months. The electrode shows better selectivity towards Hg(2+) ions in comparison with the alkali, alkaline and some heavy metal ions; most of these metal ions do not show significant interference (K(Pot)(Hg,)(M) values of the order of 10(-3)-10(-4)). The present sensor showed comparable or even better performance vis-à-vis similar PVC based ion-selective electrodes reported in literature. The sensor was also applied as an indicator electrode for potentiometric titration of Hg(2+)ions with I(-) and Cr(2)O(7)(2-).
一种基于水杨醛缩硫代氨基脲的新型离子选择性 PVC 膜电极被成功开发为汞(II)离子传感器。该电极具有优异的电位响应特性，在 1.778x10(-6)-1.0x10(-1) M 的宽浓度范围内呈现出线性的 log[Hg(2+)]与 EMF 响应，Nernst 斜率为 29 mV/decade，检测限为 1.0x10(-6) M。电极的响应时间小于 30 s，膜电极在 pH 值为 1.0-3.0 的范围内运行良好。传感器的寿命约为 2 个月。与碱金属、碱土金属和一些重金属离子相比，该电极对 Hg(2+)离子具有更好的选择性；这些金属离子大多数不会产生显著的干扰（K(Pot)(Hg,)(M) 值在 10(-3)-10(-4) 之间）。与文献中报道的类似 PVC 基离子选择性电极相比，本传感器具有相当甚至更好的性能。该传感器还可用作电位滴定法测定 Hg(2+)离子与 I(-)和 Cr(2)O(7)(2-)的指示电极。
