Time filter

Source Type

Monte Porzio Catone, Italy

Beolchini F.,Marche Polytechnic University | Fonti V.,Marche Polytechnic University | Rocchetti L.,Marche Polytechnic University | Saraceni G.,Marche Polytechnic University | And 2 more authors.
Chemistry and Ecology

This study deals with laboratory-scale investigations to evaluate the efficiency of different chemical leaching agents (i.e. sulfuric, oxalic and citric acids) and bioleaching processes (based on different acidophilic bacterial strains) on the mobilisation of metals/semi-metals in contaminated harbour sediments. A simplified life-cycle assessment was also performed in order to compare the investigated strategies in terms of their main environmental impacts. The different chemical leaching agents provided different extraction efficiencies of toxic metals. Among the investigated chemical leaching agents, citric acid 0.5 M and sulfuric acid pH 2 were the most effective, with average mobilisation efficiencies of ∼30% for Zn and Cr, ∼40% for Ni, and 35 and 58% for As, under citric and sulfuric acid, respectively. Similar higher extraction efficiencies of metals were also observed in bioleaching experiments with the presence of ferrous iron. The life-cycle assessment revealed that treatments based on diluted sulfuric acid are a better option considering both resource requirements and emissions, leading to lower environmental impacts compared with the other treatment strategies. Overall results from this study provide new insights for the definition of the most efficient and environmentally friendly strategies to be used for dredged sediments contaminated with metals. © 2013 Copyright Taylor and Francis Group, LLC. Source

Pandola L.,National Institute of Nuclear Physics, Italy | Andenna C.,INAIL
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

Abstract The bremsstrahlung spectra produced by electrons impinging on thick targets are simulated using the Geant4 Monte Carlo toolkit. Simulations are validated against experimental data available in literature for a range of energy between 0.5 and 2.8 MeV for Al and Fe targets and for a value of energy of 70 keV for Al, Ag, W and Pb targets. The energy spectra for the different configurations of emission angles, energies and targets are considered. Simulations are performed by using the three alternative sets of electromagnetic models that are available in Geant4 to describe bremsstrahlung. At higher energies (0.5-2.8 MeV) of the impinging electrons on Al and Fe targets, Geant4 is able to reproduce the spectral shapes and the integral photon emission in the forward direction. The agreement is within 10-30%, depending on energy, emission angle and target material. The physics model based on the Penelope Monte Carlo code is in slightly better agreement with the measured data than the other two. However, all models over-estimate the photon emission in the backward hemisphere. For the lower energy study (70 keV), which includes higher-Z targets, all models systematically under-estimate the total photon yield, providing agreement between 10% and 50%. The results of this work are of potential interest for medical physics applications, where knowledge of the energy spectra and angular distributions of photons is needed for accurate dose calculations with Monte Carlo and other fluence-based methods. © 2015 Elsevier B.V. All rights reserved. Source

Del Gaudio M.,INAIL
Giornale Italiano di Medicina del Lavoro ed Ergonomia

Many workers are exposed to direct solar radiation. In these conditions the workers may suffer damage to health due to an excessive increase in body temperature, or to the loss of liquids. Were carried out tests to determine if the use of screens made of various materials can reduce the physiological effects. Using the indexes WBGT and PHS were calculated the internal body temperature and the amount of fluids lost, before and after use of the screen. The best screens were those made of cardboard, newspaper paper and beach umbrellas. © PI-ME, Pavia 2015. Source

Sergi M.,University of Teramo | Montesano C.,University of Rome La Sapienza | Odoardi S.,University of Rome La Sapienza | Mainero Rocca L.,University of Rome La Sapienza | And 3 more authors.
Journal of Chromatography A

The evaluation of oral fluids (OFs) levels is useful in proving drug consumption, particularly for monitoring abuse in workplaces and for the driving under the influence of drugs (DUIDs) programs. OF is a complex matrix and a small amount of sample is available, especially after cannabis smoking. This paper reports a method for the determination of cannabinoids and metabolites in OF: THC, 11-hydroxy-THC (OH-THC) and THC-COOH. Cannabidiol (CBD) and cannabinol (CBN) were also detected by LC-MS/MS. The OF pre-treatment was based on micro-extraction by packed sorbent (MEPS), a recently developed solid phase extraction technique which operates with small sample volumes: only 125μL of sample was required, allowing the collection by simple expectoration. Analytes elution was achieved using 2×25μL of 50mM NH4OH in methanol. A rapid and effective clean-up has been obtained with satisfactory recovery values and a negligible matrix effect. The LOQs ranged between 0.020ngmL-1 for THC-COOH and 0.40ngmL-1 for OH-THC. The chromatographic conditions obtained with a fused-core column allowed a good separation of the analytes in 6min only. The whole procedure has been validated according to SOFT/AAFS guidelines. © 2013 Elsevier B.V. Source

The authors analyze the budget accident at work and occupational diseases in the construction industry through the data banks Inail. This analysis is carried out by comparing the data for this sector of economic activity (classification of economic activities ATECO 2002) with those general with particular attention to how an event, occurrence, mortality, by plotting the trends of this phenomenon than in previous years. It also analyzes the phenomenon of the complaints of occupational diseases with the comparison with the general data as well as with the analysis of the most frequent types of occupational diseases in this sector in the last two years. © PI-ME, Pavia 2012. Source

Discover hidden collaborations