Piezoelectric detection of water with a separated electrode

A new detector of water based on the piezoelectric crystal with separated electrode (PCSE) is proposed. The frequency response of the PCSE to the dielectric constant of nonelectrolyte solution is derived. The detector was applied to determine the microcontent of water in organic solvents. The detection limits are 0.022, 0.013 and 0.010 g/L in acetone, tetrahydrofuran, and dioxane, respectively. For the water content in ethanol, linear and nonlinear regression methods are employed, and the average relative errors of prediction are 1.67% and 2.77%, respectively