Manuel Palencia

Liquid-Phase Polymer-Based Retention: Theory, Modeling, and Application for the Removal of Pollutant Inorganic Ions

The aim of this work is to give the theoretical background of liquid-phase polymer-based retention (LPR) technique, provide a complete model of separation process, and evaluate its application for the removal of pollutant inorganic ions (PIIs) from aqueous solution. Thus, fundaments of LPR modeling by washing method from the ion distribution in active and passive zones are specified and its application was evaluated for cadmium removal using poly(sodium styrene sulfonate) as water-soluble polymer (WSP). LPR simulations were performed using a semiempirical description from data of concentration, filtration factorm, and retention coefficients. It is concluded that semiempirical simulation of PII retention by WSP can be performed from a small amount of experimental data using the described modeling. In addition, new approximations associated with molecular structure of polymer should be performed and linked to parameters of LPR experiments.

Functional transformation of Fourier-transform mid-infrared spectrum for improving spectral specificity by simple algorithm based on wavelet-like functions

Graphical abstract

Capacidad de Discriminación de Dos Redes de Sensores como Unidades Sensibles de una Mini-Lengua Electrónica sobre Muestras de Leche

espanolEn este articulo se presentan los resultados de discriminacion de dos redes de sensores. Una de estas redes de sensores se conformo por electrodos comerciales serigrafiados con materiales electroactivos y la otra red de sensores se elaboro a partir de electrodos modificados con polipirrol y diferentes dopantes. Se analizo la capacidad de discriminacion y clasificacion de diferentes tipos de muestras de leche comercial. Los resultados muestran que el uso de sensores modificados con polipirrol permite obtener respuestas mas completas en informacion, clasificando correctamente las muestras de leche con propiedades fisicoquimicas y organolepticas diferentes mediante el uso de dos componentes principales que reprodujo el 67,6% de la informacion. Por otra parte, la red de sensores comerciales se evaluo sobre el mismo grupo de muestras e iguales condiciones, consiguiendose el 56,5% de la variabilidad de informacion, mostrando asi menos capacidad de discriminacion de las muestras analizadas. EnglishThis paper presents the development of two sensor networks as initial stage for the design of a prototype electronic tongue. One of these sensor networks was joined by commercial screen printed electrodes and the other sensor network was assembled from modified electrodes with pyrrole and different dopants. The capacity of discrimination and classification of different types of samples of commercial milk to two sensor networks was analyzed. The results show that the use of modified sensors with conductive polymers allows obtaining more complete information, classifying correctly samples of milk with different organoleptic and physico-chemical properties by the use of two main components that reproduced the 67,6% of information. On the contrary, the commercial sensor network evaluated on the same group of samples and equal conditions, obtaining 56,5% of the variability of information, showing in this way lower classifying capacity of the samples analyzed.

Extractants for available boron in limed acid soils and its correlation in crops with high carbon storage capacity (Tectona grandis)

ABSTRACT The objective of this work was to evaluate the efficiency of six extractants for available boron in acid soils undergoing to liming, and to correlate the results of soil analysis with foliar response seen in the teak plants in greenhouse conditions. Acid soil samples were collected and their chemical characterization was performed using standard analysis protocols. Later, agricultural lime was added to the experimental units in greenhouse conditions in order to control the soil acidity and these were incubated for 30 days. Six extracts for available boron were evaluated and correlated with response in the plant by foliar analysis. It is concluded that a high dissolution power of boron extractant solution produces a high sensitive in the determination of the changes of boron concentration in the limed acid soil. These methods are seen to be not adequate for the determination of available boron contents at high concentrations.