Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia
Total 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 distin...
- Autores:
- Tipo de recurso:
- Fecha de publicación:
- 2020
- Institución:
- Universidad de Medellín
- Repositorio:
- Repositorio UDEM
- Idioma:
- eng
- OAI Identifier:
- oai:repository.udem.edu.co:11407/5943
- Acceso en línea:
- http://hdl.handle.net/11407/5943
- Palabra clave:
- Colombia
Fractionation
Gold mines
Mercury
Methylmercury
Sediments
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- http://purl.org/coar/access_right/c_16ec
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Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| title |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| spellingShingle |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia Colombia Fractionation Gold mines Mercury Methylmercury Sediments |
| title_short |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| title_full |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| title_fullStr |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| title_full_unstemmed |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| title_sort |
Distribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in Colombia |
| dc.subject.spa.fl_str_mv |
Colombia Fractionation Gold mines Mercury Methylmercury Sediments |
| topic |
Colombia Fractionation Gold mines Mercury Methylmercury Sediments |
| description |
Total 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 |
| publishDate |
2020 |
| dc.date.accessioned.none.fl_str_mv |
2021-02-05T14:58:11Z |
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2021-02-05T14:58:11Z |
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2020 |
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Article |
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http://purl.org/coar/version/c_970fb48d4fbd8a85 |
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http://purl.org/coar/resource_type/c_6501 http://purl.org/coar/resource_type/c_2df8fbb1 |
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info:eu-repo/semantics/article |
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456535 |
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http://hdl.handle.net/11407/5943 |
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10.1016/j.chemosphere.2020.127319 |
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456535 10.1016/j.chemosphere.2020.127319 |
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http://hdl.handle.net/11407/5943 |
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eng |
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eng |
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85086445311&doi=10.1016%2fj.chemosphere.2020.127319&partnerID=40&md5=880281005a62835a68e6e97102f54b66 |
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258 |
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20202021-02-05T14:58:11Z2021-02-05T14:58:11Z456535http://hdl.handle.net/11407/594310.1016/j.chemosphere.2020.127319Total 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. 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Sci., 19 (11), pp. 1349-1354ChemosphereColombiaFractionationGold minesMercuryMethylmercurySedimentsDistribution of chemical forms of mercury in sediments from abandoned ponds created during former gold mining operations in ColombiaArticleinfo:eu-repo/semantics/articlehttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1Gutiérrez-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, ColombiaMarrugo-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, ColombiaDíez, S., Environmental Chemistry Department, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, E-08034, SpainMorales-Mira, G., Facultad de Ingeniería, Universidad de Medellín, Carrera 87 No. 30-65, Medellín, ColombiaMontoya-Jaramillo, L.J., Facultad de Ingeniería, Universidad de Medellín, Carrera 87 No. 30-65, Medellín, ColombiaJonathan, 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, Mexicohttp://purl.org/coar/access_right/c_16ecGutiérrez-Mosquera H.Marrugo-Negrete J.Díez S.Morales-Mira G.Montoya-Jaramillo L.J.Jonathan M.P.11407/5943oai:repository.udem.edu.co:11407/59432021-02-05 09:58:11.751Repositorio Institucional Universidad de Medellinrepositorio@udem.edu.co |