000168606 001__ 168606
000168606 005__ 20260211123813.0
000168606 0247_ $$2doi$$a10.3989/egeol.45761.1143
000168606 0248_ $$2sideral$$a148002
000168606 037__ $$aART-2025-148002
000168606 041__ $$aspa
000168606 100__ $$aGómez-González, Miguel Ángel
000168606 245__ $$aPapel de los coloides en la dispersión de arsénico en suelos de mina de Madrid
000168606 260__ $$c2025
000168606 5060_ $$aAccess copy available to the general public$$fUnrestricted
000168606 5203_ $$aIn recent years, elevated concentrations of arsenic (As) have been detected in the Tertiary detrital aquifer of Madrid. A significant number of areas where waste from old mining operations, rich in metals and metalloids, accumulate may partially explain contamination events by toxic elements. In these environments, colloidal particles can act as nanovectors for the dispersion of As, enhancing its migration and contamination of surrounding soils. This work studies the mobilization of As-rich colloids from a waste zone of an old mining operation in the Community of Madrid. These wastes, mainly composed of arsenopyrite [FeAsS] ([As] = 0.2 g kg-1), are deposited near a natural stream and exposed to environmental conditions. In order to follow the mobility of As-rich colloids, the combined techniques of asymmetric flow field flow fractionation and inductively coupled plasma mass spectrometry (AF4-ICP-MS) are used to obtain the size distribution of the colloidal fraction and associated As, while X-ray absorption spectroscopy (XAS) techniques are utilized for the study of the chemical speciation of As in the solid phase. In addition, geochemical modeling allows prediction of the thermodynamically favored phases in each of the studied areas. The mobilization of colloidal As from mining waste to water and soil located up to 1 km from the source of contamination is described. The essential role of colloidal Fe oxyhydroxides as As mobilizing nanovectors is also highlighted.
000168606 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000168606 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000168606 700__ $$aGarrido, Fernando
000168606 700__ $$0(orcid)0000-0002-4169-0357$$aLaborda, Francisco$$uUniversidad de Zaragoza
000168606 700__ $$aVillalobos, Mario
000168606 700__ $$0(orcid)0000-0002-1856-2058$$aBolea, Eduardo$$uUniversidad de Zaragoza
000168606 700__ $$aGómez-Arce, Paula
000168606 700__ $$aAguilar-Carrillo, Javier
000168606 7102_ $$12009$$2750$$aUniversidad de Zaragoza$$bDpto. Química Analítica$$cÁrea Química Analítica
000168606 773__ $$g81, 2 (2025), 1143 [18 pp.]$$tEstudios Geológicos$$x1988-3250
000168606 8564_ $$s2208478$$uhttps://zaguan.unizar.es/record/168606/files/texto_completo.pdf$$yVersión publicada
000168606 8564_ $$s2127520$$uhttps://zaguan.unizar.es/record/168606/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000168606 909CO $$ooai:zaguan.unizar.es:168606$$particulos$$pdriver
000168606 951__ $$a2026-02-11-10:28:08
000168606 980__ $$aARTICLE