Elements traça en esfalerites i galenes del dipòsit de Cierco (Pb-Zn), Alta Ribagorça, Pirineu Central

El diposit consisteix en dos filons E-W, tallats per un altre N-S. El rebliment filonia és zonat amb esfalerita- galena-calcita als nivells profunds i galena-baritina als superiors. Els elements traca en esfalerites i galenes, plenament separades, han estat analitzats mitjancant fluoresckncia de raigs X. Els resultats mostren que l'esfalerita concentra la majoria d'elements traca, preferentment Fe, Co, Cd, Sn, Sb, Ga, Cu, Ge i Ag, amb una bona correlació entre els sis primers. La galena concentra únicament Sb, Ag i As, amb bona correlació entre els dos primers. Els continguts en elements traca estan homogkniament distribuits en tot el diposit

Study of Water/Methanol-Ionic Liquid Interactions Using Mid- Infrarred Spectroscopy and Chemometrics

Poste

Impact of functional group types in ion exchange resins on rare earth element recovery from treated acid mine waters

Ion-exchange (IX) resins incorporating single functional groups (sulfonic or amino-phosphonic) and two functional groups (sulfonic and phosphonic) were evaluated for selective recovery of Rare Earth Elements (REEs) from acidic mine waters (AMW). The composition of AMW solution, complexing properties of the functional group, and acidity were investigated as key parameters for concentration and separation of REEs from transition elements (TEs). Fe has to be removed from AMW to enable REE recovery and here the AMW was treated with NaOH solutions to reach pH 3.9 where Fe(III) was selectively removed (≤99%) by precipitation of schwertmannite. Single functional IX resin containing a sulfonic group displayed a higher REE recovery efficiency and separation ratio than observed for the bi-functional resin (sulfonic/phosphonic). Concentration factors for REEs between 30 and 40 were achieved using regeneration cycles with H2SO4. The performance of the aminophosphonic resin showed lower separation factors for REEs from TEs than the two resins containing sulfonic groups. IX resins performance was improved by tuning the acidity to match the functional group reactivity, where pH adjustment to the range of 0.5-2.0 provided the highest REE/TE separation factor for the single sulfonic resin followed by the bifunctional resin. The integration of an elution cycle using Na2-EDTA/NH4Cl mixtures strongly increases the concentration factors of REE and Light REE (LREE) concentration factors of up to 260 were achieved for the single functional sulfonic resin

Customization, extension and reuse of outdated hydrogeological software

Each scientist is specialized in his or her field of research and in the tools that he or she uses during the research in a specified site. Thus, he or she is the most suitable person for improving the tools by overcoming their limitations to realize faster and higher quality analysis. However, most scientists are not software developers. Hence, it is necessary to provide them with an easy approach that enables non-software developers to improve and customize their tools. This paper presents an approach for easily improving and customizing any hydrogeological software. It is the result of experiences with updating several interdisciplinary case studies. The main insights of this approachhave been demonstrated using four examples: MIX (FORTRAN-based), BrineMIX (C++-based), EasyQuim and EasyBal (both spreadsheet-based). The improved software has been proven to be a better tool for enhanced analysis by substantially reducing the computation time and the tedious processing of the input and output data files

Solid and Aqueous Speciation of Yttrium in Passive Remediation Systems of Acid Mine Drainage

International audienceYttrium belongs to the rare earth elements (REEs) together with lanthanides and scandium. REEs are commonly used in modern technologies, and their limited supply has made it necessary to look for new alternative resources. Acid mine drainage (AMD) is a potential resource since it is moderately enriched in REEs. In fact, in passive remediation systems, which are implemented to minimize the environmental impacts of AMD, REEs are mainly retained in basaluminite, an aluminum hydroxysulfate precipitate. In this study, the solid and liquid speciation and the local structure of yttrium are studied in high-sulfate aqueous solutions, basaluminite standards, and samples from remediation columns using synchrotron-based techniques and molecular modeling. Pair distribution function (PDF) analyses and ab initio molecular dynamics density functional theory models of the yttrium sulfate solution show that the YSO4+ ion pair forms a monodentate inner-sphere complex. Extended X-ray absorption fine structure (EXAFS) and PDF analyses show that Y is retained by basaluminite, forming a monodentate inner-sphere surface complex on the aluminum hydroxide surface. EXAFS of the column samples shows that more than 72% of their signal is represented by the signal of basaluminite with which YSO4+ forms an inner-sphere complex. The atomic view of the REE configuration in AMD environments could facilitate a deeper research of REE recovery from waste generated in AMD remediation systems

Synthesis of high ion exchange zeolites from coal fly ash

This study focuses on the synthesis at a pilot plant scale of zeolitic material obtained from the coal fly ashes of the Teruel and Narcea power plants in Spain. After the optimisation of the synthesis parameters at laboratory scale, the Teruel and Narcea fly ashes were selected as low and high glass fly ashes. The pilot plant scale experiments were carried out in a 10 m3 reactor of Clariant SA (Barcelona, Spain). The results allowed obtaining 1.1 and 2.2 tonnes of zeolitic material with 40 and 55% of NaP1 content, in two single batch experiments of 24 and 8 hours, for Teruel and Narcea fly ashes, respectively. The cation exchange capacities (CEC) of the final product reached 2.0 and 2.7 meq g-1 for Teruel and Narcea zeolitic material, respectively, which are very close to the usual values reached by the high quality natural zeolitic products. Finally, with the aim of testing possible applications of the commercial NaP1-IQE and pilot plant NaP1-Narcea zeolitic products in water decontamination, efficiency for metal uptake from waste waters from electroplating baths was investigate

Participation of clinical nurses in the practical education of undergraduate nursing students

Objective: Evaluate the level of participation of clinical nurses from Castellón where Universitat Jaume I nursing students do their clinical clerkship. Identify the variables that may influence clinical nurses’ participation in students’ clinical mentorship. Method: This observational, cross-sectional and descriptive study was conducted by applying the validated IMSOC (Involvement, motivation, satisfaction, obstacles and commitment) questionnaire. These variables were collected: age, work environment and previous training. The study was conducted between January and December 2014. Results: The sample included 117 nurses. The overall mean questionnaire score was 122.838 (standard deviation ±18.692; interquartile range 95%=119.415-126.26). The variable Previous training for mentorship students was statistically significant in the overall score and for all dimensions (p<0.05). Primary care nurses obtained better scores in the dimension Implication than professionals working at other care levels. Conclusion: The level of participation of the clinical nurses from Castellón is adequate. The previous training that professionals received for mentoring students improves both their level of participation and primary care level. Extending this research to other national and international environments is recommended.Objetivo: Evaluar el nivel de participación de las enfermeras clínicas del entorno sanitario de la Universitat Jaume I de Castellón donde realizan las prácticas los estudiantes de Grado en Enfermería. Identificar variables que pueden influir en el nivel de participación de las enfermeras clínicas en la tutela clínica de los estudiantes. Método: Estudio observacional, transversal y descriptivo realizado mediante la aplicación del cuestionario validado IMSOC (Implicación, Motivación, Satisfacción, Obstáculos y Compromiso). Se recogieron las variables edad, ámbito de trabajo y formación previa para tutorizar estudiantes. El estudio se llevó a cabo entre enero y diciembre de 2014. Resultados: La muestra fue de 117 enfermeras. La puntuación media global del cuestionario fue 122,84 (desviación típica=18,69; intervalo de confianza=95%=119,4-126,26) puntos. Obtuvieron significación estadística en la puntuación global las variables ámbito de trabajo y recibir formación previa para tutelar estudiantes (p<0,05). También se observó que las enfermeras de atención primaria obtuvieron mejores puntuaciones en la dimensión Implicación que los profesionales de otros niveles asistenciales. Conclusiones: El nivel de participación de las enfermeras clínicas de la provincia de Castellón es adecuado. La formación previa que reciben los profesionales para la tutorización de estudiantes, así como pertenecer al ámbito de la atención primaria, mejora su nivel de participación. Se recomienda ampliar la investigación a otros entornos tanto a nivel nacional como internacional

El turismo activo en la comunidad. Relación entre impactos percibidos por los residentes y apoyo al desarrollo del sector

The relationship between the tourism sector and sport has grown in importance, both academically and professionally. Residents also have an important role to play in harmonizing the development of the activity in the community, especially in those towns where tourism is the predominant sector. The objective of this study is to analyse which impacts associated with active tourism are perceived by residents and which are the best predictors of support for the development of this type of activity in the community. In addition, a descriptive analysis of the items corresponding to residents' perceptions of the impacts associated with active tourism has been carried out, as well as their support for its development in the area. Consequently, the importance of the assessment of these impacts by the bodies responsible for planning, organising and managing the sector is significant.La relación entre el sector turístico y el deporte ha crecido en importancia, tanto a nivel académico como profesional. Asimismo, los residentes tienen un importante papel a la hora de armonizar el desarrollo de la actividad en la comunidad, sobre todo en aquellas poblaciones donde la actividad turística es el sector predominante. El objetivo de este estudio es analizar qué impactos asociados al turismo activo son percibidos por los residentes y cuáles son los mejores predictores del apoyo al desarrollo de este tipo de actividad en la comunidad. Además, se ha realizado un análisis descriptivo de los ítems correspondientes a las percepciones de los residentes sobre los impactos asociados al turismo activo, así como su apoyo al desarrollo del mismo en la localidad. Resulta consecuente, la importancia en la evaluación de estos impactos por parte de los organismos encargados de la planificación, organización y gestión del sector