000078284 001__ 78284
000078284 005__ 20191126134635.0
000078284 0247_ $$2doi$$a10.1016/j.chemosphere.2018.01.100
000078284 0248_ $$2sideral$$a104557
000078284 037__ $$aART-2018-104557
000078284 041__ $$aeng
000078284 100__ $$aGomez-Gonzalez, M.A.
000078284 245__ $$aIron oxide - clay composite vectors on long-distance transport of arsenic and toxic metals in mining-affected areas
000078284 260__ $$c2018
000078284 5060_ $$aAccess copy available to the general public$$fUnrestricted
000078284 5203_ $$aMine wastes from abandoned exploitations are sources of high concentrations of hazardous metal(oid)s. Although these contaminants can be attenuated by sorbing to secondary minerals, in this work we identified a mechanism for long-distance dispersion of arsenic and metals through their association to mobile colloids. We characterize the colloids and their sorbed contaminants using spectrometric and physicochemical fractionation techniques. Mechanical action through erosion may release and transport high concentrations of colloid-associated metal(oid)s towards nearby stream waters, promoting their dispersion from the contamination source. Poorly crystalline ferrihydrite acts as the principal As-sorbing mineral, but in this study we find that this nanomineral does not mobilize As independently, rather, it is transported as surface coatings bound to mineral particles, perhaps through electrostatic biding interactions due to opposing surface charges at acidic to circumneutral pH values. This association is very stable and effective in carrying along metal(oid)s in concentrations above regulatory levels. The unlimited source of toxic elements in mine residues causes ongoing, decades-long mobilization of toxic elements into stream waters. The ferrihydrite-clay colloidal composites and their high mobility limit the attenuating role that iron oxides alone show through adsorption of metal(oid)s and their immobilization in situ. This may have important implications for the potential bioavailability of these contaminants, as well as for the use of this water for human consumption. Capsule: This study indicates that nano-ferrihydrite may mobilize arsenic as mineral coatings on the surface of clay minerals. This demonstrates the role of iron coatings as arsenic scavengers and potential vector.
000078284 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/BES-2011-046461$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2010-17434$$9info:eu-repo/grantAgreement/ES/MINECO/EEBB-I-15-09807
000078284 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000078284 590__ $$a5.108$$b2018
000078284 591__ $$aENVIRONMENTAL SCIENCES$$b32 / 250 = 0.128$$c2018$$dQ1$$eT1
000078284 592__ $$a1.448$$b2018
000078284 593__ $$aChemistry (miscellaneous)$$c2018$$dQ1
000078284 593__ $$aEnvironmental Chemistry$$c2018$$dQ1
000078284 593__ $$aPollution$$c2018$$dQ1
000078284 593__ $$aHealth, Toxicology and Mutagenesis$$c2018$$dQ1
000078284 593__ $$aMedicine (miscellaneous)$$c2018$$dQ1
000078284 593__ $$aEnvironmental Engineering$$c2018$$dQ1
000078284 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000078284 700__ $$aVillalobos, M.
000078284 700__ $$aMarco, J.F.
000078284 700__ $$aGarcia-Guinea, J.
000078284 700__ $$0(orcid)0000-0001-5382-0561$$aBolea, E.$$uUniversidad de Zaragoza
000078284 700__ $$0(orcid)0000-0002-4169-0357$$aLaborda, F.$$uUniversidad de Zaragoza
000078284 700__ $$aGarrido, F.
000078284 7102_ $$12009$$2750$$aUniversidad de Zaragoza$$bDpto. Química Analítica$$cÁrea Química Analítica
000078284 773__ $$g197 (2018), 759-767$$pChemosphere$$tCHEMOSPHERE$$x0045-6535
000078284 8564_ $$s447295$$uhttps://zaguan.unizar.es/record/78284/files/texto_completo.pdf$$yPostprint
000078284 8564_ $$s7868$$uhttps://zaguan.unizar.es/record/78284/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
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000078284 951__ $$a2019-11-26-13:43:26
000078284 980__ $$aARTICLE