1,720,993 research outputs found
Microanalytical Determinations to Distinguish Maiolica and Mezza Majolica Ceramics from Faenza (Emilia-Romagna Region, Italy)
No full textPost-Renaissance ceramics (XVI–XIX) obtained in the Emilia Romagna region (north of Italy) demonstrate the difficulty in correctly identifying two different main types of artifacts: (i) enamel terracotta (or majolica) and (ii) glazed engobed terracotta (or mezza-majolica). This problem arises from the fact that the two different artifacts have the same shape, mixture, and even the same decoration in terms of color and style. Based only on macroscopic observation, the distinction between majolica and mezza-majolica could be problematic. This study aims to propose an immediate identification of the finds by diagnostic investigations to achieve identification of the type of coating applied. Different kinds of archeological finds were collected during a restoration of an important building in the city center of Faenza, Italy, and were analyzed by optical transmitted light polarized microscopy on thin sections, scanning electron microscope (SEM-EDS), and colorimetry analysis. The results identified two types of clayey material; one was Fe enriched carbonate clay and the other had Fe enriched non carbonate clay used in the production of the ceramic artifact. The analysis also distinguishes the different techniques by which the artifacts were produced, either by single firing or by double firing
Petrographic and physical-mechanical investigation of natural aggregates for concrete mixtures
Full text linkThe availability of different lithology with which concrete can be packaged could create substantial questions on the differences that they can provide to the same mixture. Different kinds of aggregates were analyzed individually to investigate their main characteristics, which allowed us to package five types of concrete mixtures. These five mixtures were compared to each other through compressive strength values. Furthermore, it was considered microscopically what possible differences could exist between these different mixtures, for example, differences in the cement/aggregate reaction. The chemical characterization of the aggregates, used as the skeleton of the cement mixes, was proposed as an important investigative phase in order to better understand the differences in the geotechnical and physical-mechanical characteristics and to verify the presence of any harmful phases for the durability of the concrete
ICP-MS Triplo Quadrupolo come tecnica analitica per la definizione dell'impronta in traccia e ultra-traccia di olio extravergine di oliva
Full text linkL'olio extravergine di oliva è un prodotto tipico dell'area mediterranea e la tutela della sua origine viene continuamente monitorata. In questo lavoro di ricerca è stata messa a punto la metodologia per analizzare campioni di olio extra vergine di olive con lo spettrometro di massa triplo quadrupolo, installato presso il Laboratorio Tracciabilità (FSN-SICNUC-TNMT) del Brasimone. Per individuare la metodologia di preparazione dei campioni ottimale, sono stati analizzati 24 campioni di olio d'oliva di diversa provenienza geografica (Rizzo et al., 2019), i cui risultati in ICP-MS-QQQ sono poi stati elaborati con tecniche chemiometriche per determinare l'affidabilità del metodo
ICP-MS triple quadrupole as analytical technique to define trace and ultra-trace fingerprint of extra virgin olive oil
Full text linkExtra virgin olive oil is a typical product of Mediterranean area, and its origin protection is continuously improved. 24 olive oil samples from different geographical origin were analyzed and 40 elements were evaluated with chemometric techniques. This study aims at elaborating a method to determine mineral composition of this matrix and at validating the method used to determine its reliability. The high-level laboratory facilities for trace element/isotopic analysis realized in ENEA Brasimone (Italy) is a useful tool to reduce the limit of detection of elements, cutting down pollutants. Both Clean Laboratory for sample pre-treatment and Clean Room Standard ISO 6 are constantly monitored to guarantee the control quality. The results obtained using ICP-MS Triple Quadrupoles show changes between the analysed samples. Finally, Principal Component Analysis was conducted to better characterize olive oil products from different geographical origin, providing a fingerprint of the element patterns in the samples
Assicurazione di qualità e Controllo della qualità nel laboratorio FSN-SICNUC-TNMT del C.R. ENEA Brasimone
Full text linkIl Laboratorio Tracciabilità (FSN-SICNUC-TNMT) del C.R. ENEA del Brasimone svolge attività per l'analisi radiochimica e la determinazione della contaminazione radioattiva. Esegue controlli e valutazioni della contaminazione in diversi tipi di campioni ambientali, sia a scopo di monitoraggio e sorveglianza sia per lo studio e la valutazione di processi ambientali con l’utilizzo di radioelementi utilizzati come traccianti. Per cercare di garantire un elevato standard qualitativo dei propri risultati si è dotato di un Sistema di Gestione in Qualità ed ha ottenuto la certificazione di parte terza in conformità alla norma UNI EN ISO 9001:2015. Qui di seguito vengono descritti i concetti fondamentali del sistema di gestione di qualità introdotti per riuscire a mantenere e assicurare un buon livello qualitativo dei dati analitici rilasciati ai clienti
Determination of Bio Content in Polymers used in the Packaging of food Products
No full textThe ENEA Radiocarbon Laboratory (Bologna, Italy) has been operating since 1985; it is the oldest among such laboratories operating in Italy and has been active for about 30 years in the field of dating of different types of samples with the radiocarbon (14C) liquid scintillation method. This study shows the detailed procedure for radiocarbon analysis on bioplastic materials by means of the synthesis of benzene, which includes CO2 production and purification, synthesis of acetylene, and synthesis and collection of benzene. The changes made to the original design of the synthesis procedures and the operational parameters adopted to optimize the combustion of the plastic materials are described. The measurement of 14C activity was performed using the liquid scintillation counting technique by a QuantulusTM 1220 low-background counter. The δ13C content was compared with the percentage of 14C concentration for the characterization of the bio content in plastic used in the food packaging
Saharan dust particles in snow samples of Alps and Apennines during an exceptional event of transboundary air pollution
No full textSouthern European countries are often affected in summer by transboundary air pollution from Saharan dust. However, very few studies deal with Saharan dust pollution at high altitudes in winter. In Italy, the exceptional event occurred on February 19, 2014, colored in red the entire mountain range (Alps and Apennines) and allowed to characterize the particulate matter deposited on snow from a morphological and chemical point of view. Snow samples were collected after this event in four areas in the Alps and one in the Apennines. The particulate matter of the melted snow samples was analyzed by scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDS) and by inductively coupled plasma mass spectrometry (ICP-MS). These analyses confirmed the presence of Saharan dust particle components in all areas with similar percentages, supported also by the positive correlations betweenMg-Ca, Al-Ca, Al-Mg, and Al-K in all samples
Caratterizzazione della frazione biobased in liquidi organici
Full text linkNel rapporto si riporta la determinazione della frazione di origine biologica in componenti organici allo stato liquido. Nello specifico sono state misurate le percentuali di carbonio di origine biologica (denominato “carbonio moderno”) in campioni di solventi organici forniti dalla ditta AREXONS
Morphological and chemical analysis of tremolite related to natural asbestos in the road paving
No full textAbstract Tremolite group minerals could be present in the aggregate used as filler in the mix asphalt floor in the road surfaces and are subject to wear for vehicular traffic and materials ageing. Dust produced by the degradation of asphalt surfaces can disperse tremolite group minerals present in road paving causing exposure by asbestos fiber to an increasing number of people and animals. In recent years, attention has been focused on naturally occurring asbestos (NOA) as the greatest frequency of lung cancer has been observed in environments characterized by rocks and soils rich in Tremolite that characterize asbestos minerals. Asphalt samples object of this study were collected in a motorway segment of the Lombardia Region (north of Italy) for an exposure assessment research on road paving workers. The evaluation was performed using a metrological approach based on petrographic and mineralogical analyses in order to reduce the epidemiologic risks and to define the best treatment strategies on waste management with sustainable costs in fulfilment of Council Directive 67/548/EEC (1967) and EC Regulation 1272/ 2008 (2008) (Paglietti et al., 2016). The fibers are generally not broken down to other compounds in the environment, but asbestos hazard could be related to the occurrence of tremolite fiber in road paving arises when natural weathering processes (e.g., erosion) or human activities (e.g., continuous passage of motorized vehicles) separate and break down the fibers, which could be lost into the environment as airborne and easily penetrate into the human respiratory tract (Punturo et al., 2019). Despite this, this work is not an epidemiological risk analysis but obtained data could be useful to other specialists to define the exposure risks. © 2020 International Union of Geological Sciences
Study of the optical properties of ionic liquids by Liquid Scintillation Counting
No full textIonic liquids (ILs) are promising materials in a range of environmentally friendly chemical processes, as they have a number of advantages as “green solvents” over conventional molecular organic solvents. Our interest is in their potential use as CO2 trapping reagents alternative to traditional amine-based solvents for radiocarbon analysis in Liquid Scintillation Counting. Currently there are no information concerning the compatibility of such materials with scintillation cocktail and technique. Preliminary results on two commercial ILs properties are herein presented
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