Chemical Frequencymetry——Theory and Application

A new theory named "Chemical frequencymetry" is proposed. It is based on chemical reactions followed by piezoelectric monitoring. The frequency shift caused by the chemical reaction is related to the fundamental frequency （f） and overtone order （h） of the crystal, the formula weight （m） and diffusion coefficient （D） of the active chemical species, the diffusion layer thickness （δ）, the response time （t）, the concentration of the determinant （CA） and the stoichiometric factor of the chemical reaction （k） according to the formula Δf=-4.6×106 hmf2Dδ-1tkCA. The technique has been applied to the determination of analgin as an example of its application.