A8.1 - Water quality assessment by combining impedance spectroscopy measurement with cyclic voltammetry

Abstract

Optimum detergent dosage during a washing process depends on water quality, degree of pollution and quantity of laundry. Particularly, water quality is an important factor. Other parameters like carbonateor non-carbonate hardness and calcium-magnesium ratio in addition to total hardness of water have an impact on the amount of detergent. This work discusses the possibilities to realize a detergent sensor which measures important parameters for the washing process and assess the ideal necessary amount of detergent during the washing process. We propose to combine impedance spectroscopy with cyclic voltammetry in order to determine both water quality and concentration of detergent in the suds which build up the basis for an optimum detergent dosage. The results of cyclic voltammetry show that it is possible to identify the calcium-magnesium ratio and the carbonate hardness separately, which is necessary for the optimization of the washing process. Impedance measurements identify total hardness and detergent concentrations.