Search results for "XRF"
showing 10 items of 106 documents
Comparative Study of PM10 Concentrations and Their Elemental Composition Using Two Different Techniques during Winter–Spring Field Observation …
2022
The aims of this study were to determine the concentrations and elemental composition of PM10 in the village of Kotórz Mały (Poland), to analyse their seasonal variability, to determine the sources of pollutant emissions and to compare the consistency of the results obtained using different methods. Sampling and weather condition measurements were carried out in the winter (January–February) and spring (April) of 2019. Two combinations of different techniques were used to examine PM10 concentrations and their chemical composition: gravimetric method + atomic absorption spectrometry (GM+AAS) and continuous particle monitor + energy dispersive X-ray fluorescence (CPM+EDXRF).…
Portable non invasive analyses for Cultural Heritage
2014
The requirements that the scientific analyses for Cultural Heritage must have are: nondestructive and noninvasive, multielemental, sensitive, reliable and sufficiently rapid, able to carry out measurements in situ on objects of all types, and to deduce information practically on-line. Among the techniques that fulfill these requirements we find: multispectral imaging, portable EDXRF, Raman and UV-VIS-NIR spectrometry. In this paper we are going to show some cases in which it will appear clear the necessity of the correct order with which applying the non invasive techniques and what data of each of them it is necessary to understand in situ to obtain the maximum of the subsequent scientific…
Degradation study of XVIII century graffiti on the walls of Chiaramonte Palace (Palermo, Italy)
2010
A systematic investigation of the original materials and the degradation phenomena induced by soluble salts on the wall matrix and on the graffiti of the Inquisition jails of Chiaramonte Palace in Palermo (Italy) was carried out. Built in the XIV century, Chiaramonte Palace was used as Inquisition court during the XV–XVI centuries. The ancient graffiti, recently discovered, represent a unique historical witness of the prisoners that lived during that terrible period. In order to study the nature, the amount and the distribution of the salts in the masonry, stone materials sampled at different depth from the wall matrix and saline efflorescences were analysed. Different physical techniques w…
Major and Trace Element Geochemistry of the European Kupferschiefer – An Evaluation of Analytical Techniques
2018
Simple and rapid techniques are needed for routine quantitative chemical bulk-rock analyses of Kupferschiefer, a black shale containing variable amounts of silicates, base metal sulphides, carbonates and an organic content of up to 30 weight percent. In this study, WD-XRF, TXRF, and ICP-OES of acid- as well as peroxide-digested samples were tested as potential techniques based on their availability and adaptability to analyse major (Si, Ti, Al, Mg, Ca, Fe, K, but also Cu, Zn, Pb) and selected trace (Ag, As, Ba, Co, Mo, Ni, V) element concentrations. Because of the absence of a suitable reference material, a comparative study was undertaken using instrumental neutron activation analysis to a…
XRF analysis to identify historical photographic processes: The case of some Interguglielmi Jr.’s images from the Palermo Municipal Archive
2017
Abstract In the early period, even though professional photographers worked with similar techniques and products, their artistic and commercial aims determined different choices and led them to follow different, often personal, recipes. For this reason, identification of the techniques through date and name of the photographer or through some visual features like colour, tonality and surface of the image layer, often needs further investigation to be proved. Chemical characterization, carried out in a non or micro destructive way, can be crucial to provide useful information about the original composition, degradation process, realization technique, in obtaining an indirect dating of the ph…
Indagini Scientifiche
2019
In questo contributo sono riportati i risultati della campagna diagnostica effettuata sul dipinto murale “Atelier“, opera giovanile di Antonio Sanfilippo (1923-1980), ritrovato sotto una scialbatura che, sebbene lo abbia nascosto, allo stesso tempo lo ha preservato.
Hroma satura noteikšana cementa ražošanas izejmateriālos un ražošanas telpu gaisā
2020
Literatūras apskatā apkopota informācija par hroma(VI) saturošo savienojumu kancerogēnajām īpašībām un to iedarbību uz cilvēka veselību, cementa ražošanas procesa gaitu, izejmateriālu raksturojumu, kā arī raksturotas dažas no iespējamām analīzes metodēm kopējā hroma, škīstošā hroma(VI) un hroma(III) saturošo savienojumu noteikšanai. Eksperimentālajā daļā veikta gaisa daļiņu analīze kopumā 5 dažādās ražošanas telpās izvēlētajā uzņēmumā, kā arī veikta 5 izejmateriālu paraugu analīze. Ražošanas telpu gaisa paraugi aerosolu daļiņu analīzei ņemti ar laboratorijā izgatavotu iekārtu. Izejmateriālu paraugi iegūti no attiecīgā materiāla noliktavas. Hroma masas koncentrācijas noteikšana izvēlētajos p…
Comparison of LIBS and micro-XRF measurements on bronze alloys for monitoring plasma effects
2011
The laser-induced breakdown spectroscopy (LIBS) technique is often used as atomic spectroscopic technique for elemental analysis of materials. However, it presents some drawbacks that make an accurate quantitative analysis difficult. Since the plasma properties, such as spatial inhomogeneity and plume stoichiometry strongly depend on the experimental conditions, the measurements are less reproducible. In order to evaluate the measurement fluctuations, we propose to use the more established micro X-Ray fluorescence (μ-XRF) technique for validating LIBS data. In particular, the quantitative data, obtained by varying the laser fluence, the shot numbers and the temporal acquisition parameters, …
Archaeometric evidence attesting production of indigenous archaic pottery at Monte Polizzo (Western Sicily)
2012
Excavations at the proto-urban indigenous settlement of Monte Polizzo (western Sicily) have not yielded so far any evidence of in-situ ceramic production (i.e. kiln structures). However several archaeological concerns put forward to consider it as a likely production centre of pottery during the Archaic age. In this paper a first attempt to check the compositional correspondence between ceramic fabrics and local clay sources has been made. A comprehensive archaeometric investigation of native pottery, mainly composed of matte-painted table ware dated from the 7th to the 4th century BC, recovered from the Acropolis of Monte Polizzo has allowed the identification of five distinct ‘Paste Compo…
Smago metālu saturs no Latvijas katlu mājām ievāktos pelnu paraugos
2016
Darbā ir analizēti koku atlieku dedzināšanas procesā iegūtie pelni. Noteikts pelnu sastāvs ar viļņu dispersijas rentgenfluorescence. Pelnu paraugi sagatavoti analīzēm divos veidos, ar slapjo mineralizāciju un ekstrakciju. Pelnos noteikts smago metālu saturs ar liesmas atomabsorbcijas spektrometriju, kadmija saturs noteikts arī ar elektrotermālo atomabsorbcijas spektrometriju. Apkopota informācija par pelniem, smagajiem metāliem pelnos un koksnē, citiem līdzīgiem pētījumiem, un smagajiem metāliem noteikšanas metodēm. Veikta rezultātu statistiskā apstrāde un izvērtēt smago metālu saturs pelnu paraugos un no katlu mājām ievākto pelnu piemērotība izmantošanai kā mēslošanas līdzekli mežos.