Mahajan R K, Kumar M, Sharma V, Kaur I
Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, India.
Analyst. 2001 Apr;126(4):505-7. doi: 10.1039/b008944n.
A PVC membrane electrode for silver(I) ion based on Schiff base-p-tert-butylcalix[4]arene is reported. The electrode works well over a wide range of concentration (1.0 x 10(-5)-1.0 x 10(-1) mol dm-3) with a Nernstian slope of 59.7 mV per decade. The electrode shows a fast response time of 20 s and operates in the pH range 1.0-5.6. The sensor can be used for more than 6 months without any divergence in the potential. The selectivity of the electrode was studied and it was found that the electrode exhibits good selectivity for silver ion over some alkali, alkaline earth and transition metal ions. The silver ion-selective electrode was used as an indicator electrode for the potentiometric titration of silver ion in solution using a standard solution of sodium chloride; a sharp potential change occurs at the end-point. The applicability of the sensor to silver(I) ion measurement in water samples spiked with silver nitrate is illustrated.
报道了一种基于席夫碱对叔丁基杯[4]芳烃的银（I）离子PVC膜电极。该电极在较宽的浓度范围（1.0×10⁻⁵ - 1.0×10⁻¹ mol dm⁻³）内性能良好，能斯特斜率为每十倍浓度变化59.7 mV。电极响应时间快，为20秒，在pH值1.0 - 5.6范围内工作。该传感器可使用6个月以上，电位无任何偏差。研究了电极的选择性，发现该电极对银离子相对于一些碱金属、碱土金属和过渡金属离子具有良好的选择性。该银离子选择性电极用作指示电极，以氯化钠标准溶液对溶液中的银离子进行电位滴定；终点处电位发生急剧变化。说明了该传感器在加有硝酸银的水样中测量银（I）离子的适用性。
