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Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia

dc.creatorGutiérrez-Mosquera H.
dc.creatorMarrugo-Negrete J.
dc.creatorDíez S.
dc.creatorMorales-Mira G.
dc.creatorMontoya-Jaramillo L.J.
dc.creatorJonathan M.P.
dc.date2020
dc.date.accessioned2021-02-05T14:58:11Z
dc.date.available2021-02-05T14:58:11Z
dc.identifier.issn456535
dc.identifier.urihttp://hdl.handle.net/11407/5943
dc.descriptionTotal mercury (THg) and methylmercury (MeHg) were studied in sediments from 27 abandoned gold mining ponds (AGMPs) through small-scale artisanal gold mining in the district of San Juan in Chocó region of Colombia. The AGMPs were abandoned in the last century (1997) and were grouped into three distinct groups (2–6; 7–12; 13–20 years). Overall concentration (in ng g−1) pattern of THg in sediments varied from 39.06 to 1271.32 (avg. 209.57) with 174.81 (13–20 years), 205.56 (7–12 years) and 248.33 (2–6 years) respectively. MeHg concentrations accounted for 3.3–10.9% (avg. 6.5%) of THg and were significantly correlated with THg during all periods. Correlations between organic matter (OM) vs MeHg and THg were negative in the oldest pools, signifying a “dilution effect” or “natural burial” of THg and MeHg. Results for sequential extraction indicate that the fraction of elemental Hg (Hg-e) and organo chelated Hg (Hg-o) represent the main chemical forms of Hg in the sediments, regardless of the abandonment period, whereas the bioavailable fraction was only 0.12–1.65% of THg. The significant statistical relationship between MeHg, THg and OM suggests that these parameters control the distribution, mobility, toxicity and bioavailability of Hg in the sediments of these abandoned ponds. Evaluation of THg with sediment quality guidelines indicates that the values are on the higher side for Threshold effect concentration and Upper continental crust. Comparing of MeHg with many other regions outside Colombia is a worrying factor and needs immediate attention to protect the human health. © 2020 Elsevier Ltd
dc.language.isoeng
dc.publisherElsevier Ltd
dc.relation.isversionofhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85086445311&doi=10.1016%2fj.chemosphere.2020.127319&partnerID=40&md5=880281005a62835a68e6e97102f54b66
dc.sourceChemosphere
dc.subjectColombiaspa
dc.subjectFractionationspa
dc.subjectGold minesspa
dc.subjectMercuryspa
dc.subjectMethylmercuryspa
dc.subjectSedimentsspa
dc.titleDistribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia
dc.typeArticleeng
dc.rights.accessrightsinfo:eu-repo/semantics/restrictedAccess
dc.publisher.programIngeniería Ambientalspa
dc.identifier.doi10.1016/j.chemosphere.2020.127319
dc.relation.citationvolume258
dc.publisher.facultyFacultad de Ingenieríasspa
dc.affiliationGutiérrez-Mosquera, H., Facultad de Ingeniería, Universidad Tecnológica del Chocó, Carrera 22 No.18B-10, Quibdó, Colombia, Facultad de Ingeniería, Universidad de Medellín, Carrera 87 No. 30-65, Medellín, Colombia
dc.affiliationMarrugo-Negrete, J., Departamento de Química, Facultad de Ciencias Básicas, Grupo de Agua, Química Aplicada y Ambiental, Universidad de Córdoba, Carrera 6 No. 76-103, Montería, Córdoba, Colombia
dc.affiliationDíez, S., Environmental Chemistry Department, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, E-08034, Spain
dc.affiliationMorales-Mira, G., Facultad de Ingeniería, Universidad de Medellín, Carrera 87 No. 30-65, Medellín, Colombia
dc.affiliationMontoya-Jaramillo, L.J., Facultad de Ingeniería, Universidad de Medellín, Carrera 87 No. 30-65, Medellín, Colombia
dc.affiliationJonathan, M.P., Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio la Laguna Ticomán, Del. Gustavo A. Madero, Ciudad de Mexico, C.P.07340, Mexico
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