It is reported the possibility of monitoring the presence of argon in the surface layer of materials using the fluorescent emission of characteristic K X-rays of argon by irradiation of the surface of the materials with low energy X-rays. The low energy of these characteristic X-rays, 2,97 keV, makes possible to monitor the presence of argon down a depth of some five microns.

It has been obtained bead of calcium alginate wit micro-particles of magnetite. The optimum pH for adsorption of Cu (II) lie between 4,5 and 5. From the study of the kinetic of adsorption was determined that the thermodynamic equilibrium was reached after 200 min. The adsorption data fitted well with the Langmuir model and showed the maximum adsorption capacity q(max)= 57,47 mg/g and b = 0,0784.

It has been obtained bead of calcium alginate wit micro-particles of magnetite. The optimum pH for adsorption of Cu (II) lie between 4,5 and 5. From the study of the kinetic of adsorption was determined that the thermodynamic equilibrium was reached after 200 min. The adsorption data fitted well with the Langmuir model and showed the maximum adsorption capacity q(max)= 57,47 mg/g and b = 0,0784.

En la actualidad los peloides constituyen uno de los recursos naturales de gran potencial terapéutico. Este trabajo trata de la caracterización de tres muestras tomadas de un sitio ubicado en Chiica, alrededor de 60 Km al sur de la ciudad de Lima. Las técnicas experimentales empleadas en este estudio fueron: difracción de rayos X (DRX) espectroscopia Mössbauer por transmisión (EMT), microscopía electrónica de barrido (MEB) y los análisis físico-químicos. Los resultados obtenidos por DRX exhiben en general que la muestra MLG presenta fases asociadas con los minerales Vermiculita, Calcita, Cuarzo, Illita y Montmorillonita (Bentonita). En la muestra MLGC se observa las fases asociadas a los minerales Cuarzo, Sepioiita, Kaolinita y Calcita. Por EMT a temperatura ambiente (RT) se observó que la muestra MLG presenta tres dobletes cuadrupolares asociados con sitios de Fe presentes e...