An Electrochemical Sensor for Detecting Trace Water of Organic Compounds in Non-aqueous Medium

作者：Zhao Chang-Zhi^*; Cui Bao-Xue; Li Ming-Yan

来源：Chinese Journal of Analytical Chemistry, 2015, 43(5): 729-733.

• Trace water determination
• Electrochemical sensor
• Differential pulse voltammetry
• 1, 10-Phenanthroline-5,6-dione ruthenium complex

A glassy. carbon electrode modified with electropolymerized [Ru(1,10-phenanthroline) 2(1,10-phenanthroline. 5,6-dione)(2+)] (PF6)(2) was prepared and the electrode reaction of the ruthenium complex on the electrode surface with water in non. aqueous media was investigated. The electrode was employed as working electrode of electrochemical sensor to develop a simple and convenient method for detecting trace water in organic compounds. Based on the selective response of the sensor, the trace water in organic compounds could be monitored by using the differential pulse voltammetry in non. aqueous medium. In acetonitrile solution containing 0.05 mol/L tetrabutyl ammonium hexafluorophosphate, the anodic peak currents of the modified electrode at potential of -0.12 V were proportional to water content in the range of 0.02% - 5.66% with a linear correlation coefficient of 0.9994, and the detection limit for water was estimated to be 0.005% (S/N = 3). The sensor was successfully applied to detect the trace water in acetonitrile, acetone, 93 gasoline and diesel oil. The results were consistent with those of the Karl Fischer method with the relative standard deviation of less than 3.6%, and the recovery was 94.1% - 105.0%.

• 出版日期2015-5
• 单位青岛科技大学