Search results for "Solid"

Antifascistas! ayudad a los oprimidos en el campo faccioso

Figura encadenada de peus i mans

Congreso popular provincial de la solidaridad Valencia Unidad.

En la part superior foto d'una multitud de persones, baix la llegenda

Mano ejecutora del fascismo Ayudad a los familiares de sus víctimas.

Dos membres de la Guàrdia Civil, amb fusells, en actitud de menyspreu cap a un cos sagnant als seus peus

Solidarity Purchase Groups and the new critical and ethical consumer trends: first results of a direct study in Sicily

2011

Recently in Italy, the evolution of food consumption occurs through the purchase of healthy and environmentally friendly foods. This trend is confirmed by the birth, in Italy of many solidarity purchase groups (called in Italy Gruppi di Acquisto Solidale or GAS),made up of individuals or families who choose to purchase products with a high ethical value. In this paper we try to identify socio-economic conditions and motivation of individual members of GAS, and for this purpose we developed over 205 questionnaires.

Ecosocial Innovations as Part of Social and Solidarity Economy : Local Models for a Sustainable Development

2017

Este artigo apresenta o conceito de inovacoes eco-sociais. Conceito que remete para as organizacoes locais ligadas a economia social e solidaria cuja intervencao nao deixa de atender aos desafios sociais e ecologicos, podendo ser vistos como modelos de sucesso na operacionalizacao da sustentabilidade. Baseado num estudo comparativo multi-caso internacional, a partir de uma abordagem do Servico Social, o artigo procura mostrar o trabalho desenvolvido nestas iniciativas, salientando a importância das mesmas. Entrevistas recolhidas junto dos atores locais em quatro paises permitiram identificar sete caracteristicas comuns as diferentes experiencias estudadas. Destaca-se a identificacao de um p…

Determination of organophosphate flame retardants in soil and fish using ultrasound-assisted extraction, solid-phase clean-up, and liquid chromatogra…

2017

A solid–liquid extraction method in combination with high‐performance liquid chromatography and tandem mass spectrometry was developed and optimized for extraction and analysis of organophosphorus flame retardants in soil and fish. Methanol was chosen as the optimum extraction solvent, not only in terms of extraction efficiency, but also for its broader analyte coverage. The subsequent clean‐up by solid‐phase extraction is required to eliminate matrix coextractives and reduce matrix effects. Recoveries of the optimized method were 50–121% for soil and 47–123% for biota, both with high precision (RSDs <12% in soil and <23% in biota). The method limits of detection ranged from 0.06 to 0.20 ng…

trans-4-tert-Butyl-1-methylcyclohexanol hemihydrate

2007

The title compound, C11H22O·0.5H2O, is a hemihydrate of trans-4-tert-butyl-1-methyl­cyclo­hexa­nol, containing one water and two organic mol­ecules in the asymmetric unit. Crystals were obtained from an NMR sample by very slow evaporation of the solvent. In the solid state, the title compound forms a double-layered structure with the organic and water mol­ecules connected by O—H⋯O hydrogen bonds.

Enhancing extraction performance of organophosphorus flame retardants in water samples using titanium hierarchical porous silica materials as sorbent…

2021

Abstract A sorbent for the extraction of organophosphorus flame retardants has been proposed, based on UVM-7 (University of Valencia Materials) mesoporous silica doped with titanium. Designed cartridges have been applied to the extraction and preconcentration of flame retardants in water samples, followed by gas chromatography coupled to a mass spectrometry detector. Firstly, UVM-7 materials with different contents of titanium were synthesized and characterized by several techniques, thus confirming the proper mesoporous architecture. The potential of these materials was assessed in comparison with their morphological properties, resulting Ti50-UVM-7 the best solid phase. Several extraction…

Over-evaluation of total flavonoids in grape skin extracts containing sulphur dioxide

2015

Abstract Sulphur dioxide (SO 2 ) proved to increase absorbance at 280 nm of grape skin and seed extracts containing it, diluted with ethanol–HCl to assess total flavonoids and anthocyanins in the same analysis. Additional absorbance at 280 nm was also observed in acetone:H 2 O extracts, if the acetone had not completely evaporated before the extracts were diluted with a solvent. Flavonoids were correctly quantified in the extracts when SO 2 or acetone were removed by solid-phase extraction with a C 18 RP as sorbent and methanol as eluting solvent.

Dispersive solid-phase extraction based on oleic acid-coated magnetic nanoparticles followed by gas chromatography-mass spectrometry for UV-filter de…

2011

Abstract A sensitive analytical method to concentrate and determine extensively used UV filters in cosmetic products at (ultra)trace levels in water samples is presented. The method is based on a sample treatment using dispersive solid-phase extraction (dSPE) with laboratory-made chemisorbed oleic acid-coated cobalt ferrite (CoFe 2 O 4 @oleic acid) magnetic nanoparticles (MNPs) as optimized sorbent for the target analytes. The variables involved in dSPE were studied and optimized in terms of sensitivity, and the optimum conditions were: mass of sorbent, 100 mg; donor phase volume, 75 mL; pH, 3; and sodium chloride concentration, 30% (w/v). After dSPE, the MNPs were eluted twice with 1.5 mL …