Studies on Non-potentiometric Piezoelectric Sensor System for Determination of Vitamin B_1

摘要

A piezoelectric sensor responsive to vitamin B_1 was fabricated based on the vitamin B_1-tetraphenylborate ion pair. The general performance characteristics of the sensor are presented here. The proposed sensor showed a wide working pH range, a good sensitivity and selectivity. The response range is between 1.0 X 10~(-7)―4. 9 X 10~(-5) mol/L with a detection limit of 8 X 10~(-8) mol/L at pH 4. 0. The selectivity should be attributed to the preferential adsorption of the component ion on the membrane/solution interface. The adsorption behavior of vitamin BI on the crystal surface was investigated with a quartz crystal impedance (QCI) system.