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Abstract
The signal-to-noise ratio and detection limit of a series piezoelectric quartz crystal (SPQC) in non- electrolyte liquid were investigated experimentally and explained theoretically. It is shown that the noise level of the SPQC depends greatly on the variation of solution temperature. The detection limit of the SPQC increases with increasing permittivity, and it decreases slightly with a larger cell constant. The SPQC is applied to the rapid determination of water in edible oils with a detection limit of 0.05 g L.