The reactive surface of Castor leaf [Ricinus communis L.] powder as a green adsorbent for the removal of heavy metals from natural river water

In this study, a green adsorbent was successfully applied to remove toxic metals from aqueous solutions. Dried minced castor leaves were fractionated into 63-μm particles to perform characterization and extraction experiments. Absorption bands in FTIR (Fourier Transform Infrared Spectroscopy) spectra at 1544, 1232 and 1350 cm-1 were assigned to nitrogen-containing groups. Elemental analysis showed high nitrogen and sulfur content: 5.76 and 1.93%, respectively. The adsorption kinetics for Cd(II) and Pb(II) followed a pseudo-second-order model, and no difference between the experimental and calculated Nf values (0.094 and 0.05 mmol g-1 for Cd(II) and Pb(II), respectively) was observed. The Ns values calculated using the modified Langmuir equation, 0.340 and 0.327 mmol g-1 for Cd(II) and Pb(II), respectively, were superior to the results obtained for several materials in the literature. The method proposed in this study was applied to pre-concentrate (45-fold enrichment factor) and used to measure Cd(II) and Pb(II) in freshwater samples from the Paraná River. The method was validated through a comparative analysis with a standard reference material (1643e). © 2013 Elsevier B.V. © 2013 Elsevier B.V. All rights reserved.

Abastecimiento de agua potable y el saneamiento ambiental para la población rural dispersa en América Latina = Drinking water supply and sanitation for the dispersed rural population in Latin America

Incluye Bibliografía

Search in leptonic channels for heavy resonances decaying to long-lived neutral particles

A search is performed for heavy resonances decaying to two long-lived massive neutral particles, each decaying to leptons. The experimental signature is a distinctive topology consisting of a pair of oppositely charged leptons originating at a separated secondary vertex. Events were collected by the CMS detector at the LHC during pp collisions at √s = 7 TeV, and selected from data samples corresponding to 4.1 (5.1) fb-1 of integrated luminosity in the electron (muon) channel. No significant excess is observed above standard model expectations, and an upper limit is set with 95% confidence level on the production cross section times the branching fraction to leptons, as a function of the long-lived massive neutral particle lifetime. Copyright CERN.

Water supply and sanitation for the poor: the achievements of the International Drinking Water Supply and Sanitation Decade in Latin America and the Caribbean

Includes bibliography

Sanitation in Latin America and the Caribbean: the achievements of the International Drinking Water Supply and Sanitation Decade

Includes bibliography

Provision of drinking water and sanitation to the rural population in Latin America

Includes bibliography

Horizontal co-operation in drinking water supply and sanitation in the Caribbean

Se refiere a las actividades que sirven de antecedente a las actuales iniciativas de la CEPAL en el Caribe; describe los objetivos y el alcance de la cooperación horizontal; examina la experiencia del Caribe en materia de cooperación horizontal en el sector del agua potable y del saneamiento ambiental, y sobre esa base, identifica para el Caribe las principales consideraciones relativas al fortalecimiento de la cooperación técnica y económica en el sector.

Informe del Segundo Seminario Latinoamericano sobre Cooperación Horizontal para el Decenio Internacional del Agua Potable y del Saneamiento Ambiental = Report of the Second Latin American Seminar on Horizontal Co-operation for the International Drinking Water Supply and Sanitation Decade

Incluye Bibliografía

Women and the International Drinking Water Supply and Sanitation Decade in Latin America

Includes bibliography

Detecção de Binge drinking em estudantes do ensino médio: efetividade de diferentes métodos

Pós-graduação em Alimentos e Nutrição - FCFAR

Central America: recent experience on horizontal co-operation in drinking water supply and sanitation

Presenta una visión somera del estado actual de la cooperación horizontal en lo referente al suministro de agua potable y saneamiento ambiental en los 6 países del Istmo Centroamericano. Describe las principales actividades que se han llevado a cabo, presenta los posibles campos de acción para la cooperación y recoge conclusiones generales.

Water supply situation in the LDC's of the East Caribbean at the beginning of the International Drinking Water Supply and Sanitation Decade: a brief note

Includes bibliography