Search results for "icp"
showing 10 items of 139 documents
DETERMINATION OF MACRO ELEMENTS IN GLUTEN-FREE FOOD FOR CELIAC PEOPLE BY ICP-OES
2015
This paper is the first analytical approach to the study of seven nutrients in the gluten-free foods for celiac people. The ICP-OES technique was used. One of the advantages about the use of ICP-OES for this characterization is the high selectivity and low interferences for studied elements. The concentration values of K, Li, Sr, Na, Ca, Mg and Al in seventeen gluten-free food samples are reported. Considering the average concentrations of the elements analyzed, excluding lithium, in the present study it can be concluded that they are inadequate if compared with the recommended daily intake by international organisms, providing only from 1.5 to 20% of the RDI for the essential metals. In pa…
Garnet as a monitor for melt–rock interaction: Textural, mineralogical, and compositional evidence of partial melting and melt‐driven metasomatism
2021
International audience; In this study, we focus on a partially melted garnet-bearing granulite from the Salvador–Esplanade Belt (Salvador da Bahia, Brazil), and examine the behaviour of major and trace elements during partial melting and melt-driven metasomatism. Phase equilibria modelling and U–Th– Pb geochronology show that the sample underwent partial melting during the heating segment of the decompression path from ~1.2 GPa and 675–700° C to ~0.8 GPa and 790°C at c. 2.06 Ga. During the final stage of decompression, from 0.8 to ~0.5 GPa, physical segregation of melt resulted in the establishment of chemical potential gradients and mass transfer between the host granulite and the leucosom…
Establecimiento y optimización de modelo murino de la patología ginecológica endometriosis utilizando xenografts de endometrio humano para el estudio…
2018
La endometriosis es una enfermedad con elevada prevalencia en la población de mujeres en edad fértil (Goldstein y cols, 1980; Eskenazi y cols, 1997; Gazvani y cols, 2002), que cursa con dolor pélvico crónico, dismenorrea, sangrados irregulares e infertilidad, principalmente (Goldstein y cols, 1980; Eskenazi y cols, 1997). Esta sintomatología empeora la calidad de vida de la paciente (D’Hooghe T y cols, 2006) y genera un gran gasto en términos económicos y sociales (Simoens y cols, 2007), de lo que se deriva su gran importancia. Ésto, unido a las múltiples cuestiones que se desconocen o están en controversia en relación a la génesis de la enfermedad, patogeniam diagnóstico precoz y tratamien…
Determinación multielemental de metales traza en agua de mar
2015
Los metales traza presentes en las aguas marinas, procedentes de actividades antropogénicas, constituyen un serio problema ambiental y de salud debido a su toxicidad y a las repercusiones que ocasionan sobre los seres vivos, al introducirse en la cadena trófica. La determinación de metales traza en agua de mar supone un problema analítico complejo derivado de la baja concentración a la que se encuentran los analitos y al elevado contenido salino que dificulta la cuantificación. Por ello, surge la necesidad de contar con técnicas de detección sensibles y con metodologías de separación / preconcentración de muestra que permitan aislar los analitos de la matriz y aumentar su concentración para…
The determination of antimony and arsenic concentrations in fly ash by hydride generation inductively coupled plasma optical emission spectrometry (H…
2011
Hydride generation inductively coupled plasma optical emission spectrometry (HG-ICP-OES) was used in the determination of As and Sb concentrations in fly ash samples. The effect of sample pre-treatment reagents and measurement parameters used for hydride generation was evaluated. Due to memory effects observed, the appropriate read delay time was adjusted to 60 s resulting in RSDs 0.6% and 2.3% for As and Sb, respectively. The most suitable volumes of pre-reduction reagents for 10 mL of sample were 4 mL of KI/ascorbic acid (5%) and 6 mL of HCl (conc.). The determination of Sb was significantly interfered by HF, but the interference could be eliminated by adding 2 mL of saturated boric acid …
Control of matrix interferences by multiple linear regression models in the determination of arsenic and lead concentrations in fly ashes by inductiv…
2010
A multiple linear regression technique was used to evaluate and correct the matrix interferences in the determination of As and Pb concentrations in fly ashes by inductively coupled plasma optical emission spectrometry. The direct determination of As and Pb in SRM 1633b by ICP-OES failed to obtain the certified concentrations, except in a couple of cases. However, it proved possible to use the multiple linear regression (MLR) technique to correct the determined concentrations to a satisfactory level. This method of correction is based on the multiple regression line obtained from the analysis of 19 synthetic mixtures of matrix and analyte elements (Al, As, Ca, Fe, Pb, and Si) at five concen…
Nuevos desarrollos de la espectroscopia para el análisis mineral de alimentos
2017
El trabajo recopilado en la siguiente Tesis Doctoral está basado en el desarrollo de nuevas metodologías para la determinación de elementos minerales en distintos alimentos y dietas, siguiendo los principios de la “Química Verde”: rapidez, bajo coste, simplicidad y respeto por el medio ambiente. Esta Tesis se ha realizado acogiéndose a la modalidad “compendio de publicaciones”, contemplada en el Reglamento de la Universidad de Valencia de 28/16/2016 (ACGUV 172/2016) y se ha dividido en dos secciones: la sección I, que incluye un resumen global de la temática, resumen de los principales resultados obtenidos, así como las conclusiones finales. A continuación, en la sección II se incluyen los …
Corundum Anorthosites-Kyshtymites from the South Urals, Russia: A Combined Mineralogical, Geochemical, and U-Pb Zircon Geochronological Study
2019
Kyshtymites are the unique corundum-blue sapphire-bearing variety of anorthosites of debatable geological origin found in the Ilmenogorsky-Vishnevogorsky complex (IVC) in the South Urals, Russia. Their mineral association includes corundum-sapphire, plagioclase (An61&ndash
Solid phase extraction materials as a key for improving the accuracy of silver nanoparticle characterization with single-particle inductively coupled…
2022
The accurate characterization of silver nanoparticles (Ag NPs) in environmental samples is crucial for understanding the potential impact of these materials on the environment and human health. Single-particle inductively coupled plasma mass spectrometry (spICP-MS) is one of the few techniques available for quantifying NPs at environmentally relevant concentrations. However, the spICP-MS detection of Ag NPs can be interfered with coexisting dissolved analyte causing high background signals, which mask NP signals leading to a significant bias in NP characterization. In this paper, a simple sample pre-treatment procedure for efficient removal of dissolved silver in natural waters is proposed …
Hiilen taustavaikutukset muovien lisäaineille induktiivisesti kytketyssä plasmassa
2017
Tässä tutkielmassa tarkasteltiin hiilen matriisivaikutuksia induktiivisesti kytkettyä plasmaa (ICP) hyödyntävissä analyysimenetelmissä. Kirjallisessa osassa on tarkasteltu erilaisia kiinteiden näytteiden esikäsittelymenetelmiä kiinnittäen huomiota jäännöshiilimääriin. Lisäksi läpi käydään ICP-tekniikoiden teoriaa, laitteistoa ja häiriöitä, painotuksen ollessa hiilen aiheuttamissa ongelmatekijöissä. Kokeellisessa osassa tutkittiin onko hiilellä merkittäviä vaikutuksia muovien hivenaineille (As, Cd, Cr, Pb, Sb, Sn, Zn, S) sellaisissa pitoisuuksissa, joita jäännöshiilipitoisuudelta voidaan odottaa kiinteiden näytteiden esikäsittelyn jälkeen. Jäljitellen sertifioituja muovimateriaaleja valmiste…