Ultrasonic characterization of aqueous mixture comprising insoluble and soluble substances with temperature compensation

- To detect the concentrations of aqueous mixtures at different temperatures.
- To build optimal predictive model based on Si-PLS and ultrasonic spectra.
- to apply linear interpolation for compensating temperature effects.

This paper presents an ultrasonic technique for simultaneously determining the concentrations of insoluble and soluble substances in aqueous mixtures at different temperatures. First of all, the phase velocity spectra and the attenuation spectra of aqueous mixtures which are sensitive to the concentrations of substances are analyzed. Then, a synergy interval partial least squares (Si-PLS) model is applied to build the sub-models for the concentrations of substances at different temperature points. Finally, the overall model is constructed to build the relations among the sub-models by linear interpolation, in which the temperature effects are taken into account. The experimental and analytical results show that the overall model has the potential to simultaneously determine the concentrations of substances in aqueous mixtures at different temperatures. The proposed technique is time-saving in analyzing online signals, and thus will find wide applications in laboratory and industry for investigating aqueous mixtures and monitoring online processes.