Ignasi Queralt

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council), ICTJA, Faculty Member

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Senior Researcher in Earth Sciences, Geochemistry and Environment
Address: Institute of Environmental Assessment and Water Research
Jordi Girona St., 18-26
08034 Barcelona Spain

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Papers by Ignasi Queralt

Ocupaciones efímeras en cueva desde la protohistoria hasta la actualidad: cova del Gegant (Sitges, Barcelona)

Lucentum, Jan 31, 2024

(MICINN). M. Sanz y M. Blasco han sido financiadas por el MICINN y por la Unión Europea-NextGener... more (MICINN). M. Sanz y M. Blasco han sido financiadas por el MICINN y por la Unión Europea-NextGenerationEU mediante un contrato Ramón y Cajal (RYC2021-032999-I) y Juan de la Cierva (FJC2020-045770-I) respectivamente. Los trabajos de laboratorio se han realizado en La Guixera, con el apoyo del Ayuntamiento de Castelldefels. I. Queralt investiga en IDAEA-CSIC, Centro de Excelencia Severo Ochoa financiado por AEI (CEX2018-000794-S del MCIN/AEI/ 10.13039/501100011033). Resumen Las cavidades han sido lugares utilizados reiteradamente a lo largo de la historia y con distintas funcionalidades tal y como evidencia la tipología de los restos arqueológicos hallados. Así, la presencia de materiales arqueológicos en cuevas y abrigos desde la protohistoria hasta la actualidad está documentada en un buen número de yacimientos, pero pocos han sido objeto de estudio específico. La baja tasa de sedimentación y la escasez

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Through the Looking Glass: Technological Characterization of Roman Glasses Mimicking Precious Stones from the Gorga Collection (Museo Nazionale Romano—Palazzo Altemps)

Minerals

This paper provides a detailed technological characterization of the Roman opus sectile glasses (... more This paper provides a detailed technological characterization of the Roman opus sectile glasses (second century AD) coming from the renowned Gorga collection. Nine glass samples corresponding to imitations of the porfido verde antico, cipollino rosso, rosso antico, giallo antico, diaspro nero e giallo, semesanto and agate/alabaster stones were studied. The aim of this study was twofold: (i) archaeometric, i.e., to provide valuable data on the production, raw materials and techniques of these refined Roman glasses that mimic precious stones and (ii) methodological, i.e., to highlight the good performance of combining polished thin sections and local probe measurements for the study of glassy microstructures. Based on the nature of the flux used, the glasses from the samples were classified as either natron-type or mixed-type (natron/plant ash). The latter stem from remelted glasses and contain relict grains of wollastonite that were not found in the pure natron samples. Relict wollas...

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Natural attenuation of heavy metals via secondary hydrozincite precipitation in an abandoned Pb-Zn mine

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Concentración diferencial y caracterización de filosilicatos en arcillas

Boletín de la Sociedad Española de Mineralogía, 1988

Efectos de una precipitación intensa sobre los suelos de una cuenca agrícola: cartografía de las áreas afectadas y comportamiento del horizonte Ap

Composición mineral y geoquímica de sedimentos fluviales en suspensión. Cuenca de Izas (Pirineos)

Boletín de la Sociedad Española de Mineralogía, 1989

X‐Ray Fluorescence for Multi‐elemental Analysis of Vegetation Samples

Mineralogía de los sedimentos costeros de Mogán (Gran Canaria)

Geotemas ( Madrid ), 2004

Holocene inorganic geochemical data from Borreguil de la Caldera (S Spain)

Field and laboratory tests for assessing the feasibility on the use of municipal treated wastewater for agricultural irrigation

Characterization of binders and pigments using an integrated analytical approach: Application to wooden reliefs created by Vasko Lipovac in the 1970s

Microchemical Journal, 2021

$Research paper thumbnail of Combining grazing incidence X-rays and micro-diffraction for qualitative phase identification in forensic powdered micro-samples$

Combining grazing incidence X-rays and micro-diffraction for qualitative phase identification in forensic powdered micro-samples

Forensic Science International, 2021

Capillary diffraction or microdiffraction are standard techniques for characterizing small sample... more Capillary diffraction or microdiffraction are standard techniques for characterizing small samples when only a few milligrams are available. On the other hand, we have typical grazing incidence diffraction or different variations of grazing incidence (GI) diffraction used, such as in-plane grazing incidence (IP-GI) or GI using a micro focusing source, to study thin films. However, when few powder micrograms are available, the characterization task is complicated. In the present work, few micrograms of typical forensic samples are analyzed using standard Bragg-Brentano, X-ray powder diffraction geometry, and grazing incidence X-ray micro-diffraction (GIμXRD). Samples include soils, cosmetic eyeshadows, two different pyrotechnic mate rials, and a highly explosive mixture contained at primer cup of ammunition. The analysis was carried out from 1 to 5 degrees of the incident parallel beam with a shaking sample. Depending on the fixed incident angle, different small regions of the diffraction patterns showed an improvement in the intensity of the peaks with respect to the conventional Bragg-Brentano configuration. However, 3-5 degrees of the fixed incident beam showed the best results. This new data acquisition technique, based on the combination of two known diffraction methods, could be a powerful tool for studying samples outside of forensic sciences such as nanomaterials, medicine, or any other field where the sample quantity is extremely small, also, without the need to transport evidence and travel to external facilities with higher analytical performance such as synchrotron radiation installations or other large experimental facilities.

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Effectiveness of Multielectrode Earth Resistivity Method for Characterizing Putting Greens of Golf Courses

Near Surface 2010 - 16th EAGE European Meeting of Environmental and Engineering Geophysics, 2010

The main objective of this study is to provide evidences that near-surface geophysical methods ca... more The main objective of this study is to provide evidences that near-surface geophysical methods can be useful tools for improving the maintenance and remodelling efforts of certain parts of golf courses, particularly greens. Typically, in order to determine the geometry and textural properties of soils and substrates samples should be removed from the different zone of the golf course and submitted to an accredited physical soil testing laboratory. The results from our study indicate that electrical resistivity tomography method is an efficient tool which can be used by golf course greenkeepers to assess lateral and vertical variability of soils and substrates and prevent salinity hazard from irrigation with reclaimed wastewater.The study has demonstrated that, although soil electrical resistivity depends simultaneously on many soil properties like moisture and salinity, the measurement of apparent resistivity in sandy substrates used for building putting greens can be easily correlated with his textural composition.

Platinum determination by membrane complexation and energy dispersive x‐ray fluorescence analysis—A preliminary study

X-Ray Spectrometry

Supervised Machine Learning Algorithms to Discriminate Two Similar Marble Varieties, a Case Study

Minerals

A multi-analytical approach is usually applied in provenance studies of archaeological marbles. H... more A multi-analytical approach is usually applied in provenance studies of archaeological marbles. However, for very similar marble varieties, additional techniques and approaches are required. This paper uses a case study to illustrate this with two Catalan marble districts (Gualba and Ceret) and three sets of archaeological marbles. The common multi-method approach is unable to discriminate between the two districts, and such distinction is only partially glimpsed using unsupervised multivariate data analyses on a transformed geochemical dataset of reference samples. In contrast, several supervised classification models have been successfully trained to discriminate between the quarries without any special data transformation. All the trained models agree to assign the three sets of archaeological samples to the Gualba quarry district. Additional outcomes of the paper are a comprehensive archaeometric characterization of the little-known marbles of Gualba and Ceret and the first arch...

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迅速多元素分析と植物性食品のイメージングのための低電力蛍光X線分析法の可能性【Powered by NICT】

Journal of Food Composition and Analysis, 2016

Ultratrace determination of metal ions using graphene oxide/carbon nanotubes loaded cellulose membranes and total-reflection X-ray fluorescence spectrometry: A green chemistry approach

Spectrochimica Acta Part B: Atomic Spectroscopy, 2021

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Determination of gold leaf thickness using X-ray fluorescence spectrometry: Accuracy comparison using analytical methodology and Monte Carlo simulations

Applied Radiation and Isotopes, 2019

In this work, we compared the accuracy of gold leaves thickness determination using Xray Fluoresc... more In this work, we compared the accuracy of gold leaves thickness determination using Xray Fluorescence (XRF) setups for different X-ray excitation sources. The sources used consisted on: a) direct Bremsstrahlung from an Amptek Mini-X X-ray tube with Rh target, b) partially monochromatized radiation of the same X-ray tube using combination of Al and Ag filters and, c) monochromatic radiation using secondary target, in a portable setup with triaxial geometry. The performance of the used setups was compared using model samples made with gold foil standard reference materials of known thicknesses (1, 2 and 2.5 µm). Thickness determination was based on the selective attenuation that the different energies of a given element of an under-layer undergo in the gilded layer. Ideally, as it can be expected from physics fundamentals, monochromatic radiation is needed for improved accuracy. However, considering the difficulties in using monochromatic radiation in portable instrumentation applicable in Cultural Heritage studies, filtered radiation can also be used for reliable results. Moreover, Monte Carlo simulations of the portable setup with conventional planar geometry were performed for comparison and for future application in more complex samples.

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Plant extracts as biopharmaceutical products and analysis of their activity against arsenicosis

Arsenic in the Environment - Proceedings, 2014

Alteración hidrotermal de rocas volcánicas de la isla King George (Islas Shetalan del Sur)

Ocupaciones efímeras en cueva desde la protohistoria hasta la actualidad: cova del Gegant (Sitges, Barcelona)

Lucentum, Jan 31, 2024

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Through the Looking Glass: Technological Characterization of Roman Glasses Mimicking Precious Stones from the Gorga Collection (Museo Nazionale Romano—Palazzo Altemps)

Minerals

Download

Natural attenuation of heavy metals via secondary hydrozincite precipitation in an abandoned Pb-Zn mine

Download

Concentración diferencial y caracterización de filosilicatos en arcillas

Boletín de la Sociedad Española de Mineralogía, 1988

Efectos de una precipitación intensa sobre los suelos de una cuenca agrícola: cartografía de las áreas afectadas y comportamiento del horizonte Ap

Composición mineral y geoquímica de sedimentos fluviales en suspensión. Cuenca de Izas (Pirineos)

Boletín de la Sociedad Española de Mineralogía, 1989

X‐Ray Fluorescence for Multi‐elemental Analysis of Vegetation Samples

Mineralogía de los sedimentos costeros de Mogán (Gran Canaria)

Geotemas ( Madrid ), 2004

Holocene inorganic geochemical data from Borreguil de la Caldera (S Spain)

Field and laboratory tests for assessing the feasibility on the use of municipal treated wastewater for agricultural irrigation

Characterization of binders and pigments using an integrated analytical approach: Application to wooden reliefs created by Vasko Lipovac in the 1970s

Microchemical Journal, 2021

$Research paper thumbnail of Combining grazing incidence X-rays and micro-diffraction for qualitative phase identification in forensic powdered micro-samples$

Combining grazing incidence X-rays and micro-diffraction for qualitative phase identification in forensic powdered micro-samples

Forensic Science International, 2021

Download

Effectiveness of Multielectrode Earth Resistivity Method for Characterizing Putting Greens of Golf Courses

Near Surface 2010 - 16th EAGE European Meeting of Environmental and Engineering Geophysics, 2010