Cava is a quality sparkling wine produced in Spain. As a product with a designation of origin, Cava wine has to meet certain quality requirements throughout its production process; therefore, the analysis of several parameters is of great interest. In this work, a portable electronic tongue for the analysis of Cava wine is described. The system is comprised of compact and low-power-consumption electronic equipment and an array of microsensors formed by six ion-selective field effect transistors sensitive to pH, Na+, K+, Ca2+, Cl−, and CO32−, one conductivity sensor, one redox potential sensor, and two amperometric gold microelectrodes. This system, combined with chemometric tools, has been applied to the analysis of 78 Cava wine samples. Results demonstrate that the electronic tongue is able to classify the samples according to the aging time, with a percentage of correct prediction between 80% and 96%, by using linear discriminant analysis, as well as to quantify the total acidity, pH, volumetric alcoholic degree, potassium, conductivity, glycerol, and methanol parameters, with mean relative errors between 2.3% and 6.0%, by using partial least squares regressions.

In recent years the development of information and communication technologies (ICT) has notably improved the water management processes, but the technologies for water quality control still leave much scope for improvement. Specially, in-situ and in-line water monitoring has an increasing interest in order to take decisions at real time. The main drawbacks of the current portable meters are their high cost and their high power consumption. In this work it is proposed a portable compact meter for measuring simultaneously oxidation-reduction potential (ORP), conductivity, temperature and amperometric parameters like chlorine. This system includes microsensors fabricated with microelectronic technologies, and a commercial temperature sensor, all them allowing a very low power consumption. Validation of the system has been carried out using standard solutions and comparing the results with commercial sensors. The response characteristics of sensors, in terms of sensitivity and repeatability, showed a good agreement with those obtained with standard equipment using the same microelectrodes.Index Terms-Portable equipment, microsensors, water monitoring, multiparametric analysis. 1530-437X (c)

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This article describes the design, fabrication and characterization of a compact and deployable heavy metal analyzer. The system is autonomous and its microcontroller enables the configuration of its four micropumps and the application of different electroanalytical techniques. A range of prototyping and manufacturing techniques have been used in the fabrication of the instrument, including laser sintering, milling, and laser engraving. We present the electrochemical characterization of the system, and provide preliminary results obtained in the determination of Cu and Zn in different waters. The only sample treatment consists in its 1 : 2 dilution in pH 5.6 acetate buffer. Detection limits of 2.2 and 3.8 ppb were found for Cu and Zn, respectively.