Effect of magnetic ion exchange (MIEX®) on removal of emerging organic contaminants.

In this study, the removal of nine emerging organic contaminants was investigated by using anion exchange resins. The selected compounds were carbamazepine, atrazine, simazine, estrone, bisphenol A, methylparaben, ethylparaben, propylparaben and butylparaben. Two different magnetic anionic exchanger resins were tested: MIEX® DOC and MIEX® GOLD. The optimal resin dose (40 mL/L) and contact time (20 min) had been previously determined. Once these optimum parameters were set, the effect of the initial concentration of contaminants on the removal efficiency of the contaminants by the resins was studied. The study was carried out using mono and multicomponent systems, with distilled water and natural waters, to which contaminants had been previously added, in order to evaluate the competitive and matrix effects. Results showed that the average removal percentages obtained with the MIEX® DOC resin were: 51%, 61%, 68% and 80% for methyl-, ethyl-, propyl-, and butylparaben, respectively. For bisphenol A the result was similar, i.e., 66%, whereas for the rest of the compounds studied, removal efficiencies lower than 15% were obtained. The MIEX® GOLD resin achieved lower elimination rates than the MIEX® DOC resin in all cases.

Contenido alcohólico de las bebidas "Sin alcohol" / Etanol content of "without alcohol" drinks

El presente estudio pretende hacer un análisis del contenido de etanol entre las denominadas bebidas "Sin alcohol" y que según la legislación española pueden llegar a tener un contenido alcohólico inferior al 1 por ciento vol. Se parte de los pocos estudios previos existentes y de la información que dan los productores al consumidor para establecer el contenido real por absorbancia fotométrica (enzimunoensayo) y realizar las comparaciones oportunas, con los estudios hechos y con los valores dados por las empresas que comercian las distintas bebidas. Después de un recogida de muestras de distintas bebidas "Sin" se realiza el análisis, que además de darnos el contenido real, nos permite considerar su uso en pacientes alcohólicos rehabilitados o en tratamiento con interdictores. De cualquier forma se pretende tener una información veraz para poder aconsejar o desaconsejar su consumo a los alcohólicos en tratamiento, o posteriormente a el (AU)