Viendo 1-10 de 27 resultados.
ID: 1
Autor: Alonso D, Pineda P, Olivero J, González H, Campos N
Titulo: Mercury levels in muscle of two fish species and sediments from the Cartagena Bay and the Ciénaga Grande de Santa Marta, Colombia.
Abstract: Mercury (Hg) content in sediments and muscle from two fish species were determined in Cartagena Bay and Ciénaga Grande de Santa Marta, an industrialized bay and an unpolluted estuary in the Caribbean coast of Colombia. Sampling was conducted four times during March-November 1996, including both the dry and rainy seasons. Significant differences in Hg concentration were detected both for fish and sediments between the two waterbodies. Hg values ranged from 94 to 10,293 microg/kg dry weight (dw) in sediments from Cartagena Bay and between 20 and 109 microg/kg dw in Ciénaga Grande de Santa Marta. Highest Hg concentrations were observed for the omnivorous species Eugerres plumieri, and lowest concentrations were found in the detritivorous Mugil incilis. High Hg concentrations in sediments of Cartagena Bay were detected in front of the sewage discharge of an extinct chlor-alkali plant, with decreasing concentrations in stations far from the source. Our results suggest that Hg can be persis
Revista: Environ Pollut. 2000 Jul;109(1):157-63.
ID: 2
Autor: De Miguel E , Clavijo D , Ortega MF , Gómez A.
Titulo: Probabilistic meta-analysis of risk from the exposure to Hg in artisanal gold mining communities in Colombia.
Abstract: Colombia is one of the largest per capita mercury polluters in the world as a consequence of its artisanal gold mining activities. The severity of this problem in terms of potential health effects was evaluated by means of a probabilistic risk assessment carried out in the twelve departments (or provinces) in Colombia with the largest gold production. The two exposure pathways included in the risk assessment were inhalation of elemental Hg vapors and ingestion of fish contaminated with methyl mercury. Exposure parameters for the adult population (especially rates of fish consumption) were obtained from nation-wide surveys and concentrations of Hg in air and of methyl-mercury in fish were gathered from previous scientific studies. Fish consumption varied between departments and ranged from 0 to 0.3kgd-1. Average concentrations of total mercury in fish (70 data) ranged from 0.026 to 3.3?gg-1. A total of 550 individual measurements of Hg in workshop air (ranging from <DL to 1mgm-3) and 26
Revista: doi: 10.1016/j.chemosphere.2014.01.035
ID: 3
Autor: Marcello Veiga
Titulo: Antioquia, Colombia: the world’s most polluted place by mercury: impressions from two field trips
Abstract: Worldwide, artisanal gold miners are the main consumers of mercury, using and losing almost 1000 tonnes of metallic mercury per annum or more than 30% of all mercury annually used by different industrial applications. Mercury emitted to the atmosphere and released to the environment has serious environmental and health implications. As the price of gold has been increasing, more artisanal miners are mining and processing gold using rudimentary procedures. About 10 to 15 million artisanal and small gold miners worldwide are working in more than 70 countries to produce around 350 tonnes of gold annually. The number of artisanal gold miners in Colombia is also increasing and the mercury pollution can be as high as 150 tonnes/a giving to the country the shameful first position as the largest world’s mercury polluter per capita from artisanal gold mining.
Revista: Report Prepared for UNIDO
ID: 4
Autor: Zapata LM, Bock BC, Palacio JA.
Titulo: Mercury Concentrations in Tissues of Colombian Slider Turtles, Trachemys callirostris, from Northern Colombia.
Abstract: This study determined the total mercury (THg) concentrations in pectoral muscle, blood and carapace tissue in turtles collected from Magangué and Lorica, Colombia. THg concentrations in µg/g (wet weight) were 0.39 ± 0.16 in muscle, 0.15 ± 0.08 in carapace and 0.07 ± 0.03 in blood for turtles from the Magdalena River and 0.25 ± 0.18 in muscle, 0.14 ± 0.09 in carapace and 0.06 ± 0.04 in blood for turtles from the Sinú River. Twenty-nine and ten percent of turtle muscle samples from Magangué and Lorica, respectively, exceeded the consumption advisory limit of 0.5 µg Hg/g for fish. There was a significant correlation between carapace length and THg levels for this specie, depending on the sample site. In addition, a significant correlation was observed in THg concentrations in carapace and muscle. However, significant differences were observed in the THg levels between the two study locations, with turtles caught in the Magdalena River having higher levels of THg.
Revista: Bull Environ Contam Toxicol. 2014 May;92(5):562-6
ID: 5
Autor: Cordy P, Veiga M, Crawford B, Garcia O, Gonzalez V, Moraga D, Roeser M, Wip D.
Titulo: Characterization, mapping, and mitigation of mercury vapour emissions from artisanal mining gold shops
Abstract: Artisanal miners sell their gold to shops that are usually located in the urban core, where the mercury-gold amalgam is burned to evaporate the mercury that was added during ore processing. People living and working near these gold shops are exposed to intermittent and extreme concentrations of mercury vapour. In the urban centres of Segovia, Colombia, and Andacollo, Chile, the average concentrations measured by mobile mercury vapour analyzer transects taken repeatedly over several weeks were 1.26 and 0.338?gm(-3), respectively. By World Health Organization standards, these towns are exposed to significant health hazard, and globally, the millions of miners, as well as non-miners who live near gold shops, are at serious risk of neurological and renal deficits. Measurements taken in Suriname, Ecuador and Peru reveal this to be a widespread phenomenon with unique regional variations and myriad attempts at remediation. Maps of average mercury concentrations show the spatial distribution o
Revista: Environ Res. 2013 Aug;125:82-91
ID: 6
Autor: Olivero-Verbel J1, Caballero-Gallardo K.
Titulo: Nematode and mercury content in freshwater fish belonging to different trophic levels.
Abstract: Fish are a protein source for many people in Colombia. However, environmental pollution of some aquatic ecosystems may pose health risks to humans. The aim of this study was to assess the levels of total mercury (T-Hg) in muscle and their relationship with nematode infections in fish from Dique Channel, a freshwater ecosystem located Northern Colombia. Eight hundred ninety fish specimens belonging to 13 different species were collected. T-Hg concentration was measured using atomic absorption spectroscopy, previous electrothermal atomization. Nematodes were identified as Contracaecum sp. Species such as Hoplias malabaricus and Sorubim cuspicaudus presented the highest values for Hg and parasite infection (0.09?±?0.01, 0.12?±?0.02 ?g/g; prevalence 100, 100 %, respectively), whereas the lowest were detected in Prochilodus magdalenae (0.02?±?0.002 ?g/g; 0 %). Pooled data revealed a high correlation between trophic level and parasite abundance (??=?0.771; P?=?0.002) as well as with T-Hg (??
Revista: Parasitol Res. 2013 Jun;112(6):2187-95.
ID: 7
Autor: Olivero-Verbel J1, Agudelo-Frias D, Caballero-Gallardo K.
Titulo: Morphometric parameters and total mercury in eggs of snowy egret (Egretta thula) from Cartagena Bay and Totumo Marsh, north of Colombia.
Abstract: Eggs from egrets (Egretta thula) were collected from Cartagena Bay and Totumo Marsh, two sites at the north of Colombia with different pollution background, and measured their morphometric parameters as well as total mercury (T-Hg) and calcium levels in eggshell. Statistically significant differences were observed for egg weight and size between the two sampling locations. T-Hg and calcium concentrations in eggshell were greater in eggs from Cartagena Bay, the industrial site, compared to Totumo Marsh, a non-industrial location. The opposite was observed for eggshell thickness (3.6% less in the bay). Pearson correlation analysis showed eggshell T-Hg negatively correlated with eggshell weight in eggs from the marsh (R=-0.795, P<0.006), but not from the bay (R=0.387, P=0.269), probably suggesting greater susceptibility to Hg in birds from the non-polluted site. In short, results suggest eggs from E. thula at Cartagena Bay have greater T-Hg concentrations and less eggshell thickness than
Revista: Mar Pollut Bull. 2013 Apr 15;69(1-2):105-9.
ID: 8
Autor: Marrugo-Negrete JL, Ruiz-Guzmán JA, Díez S.
Titulo: Relationship between mercury levels in hair and fish consumption in a population living near a hydroelectric tropical dam.
Abstract: In the present study, total mercury (T-Hg) concentrations were assessed in human hair samples (n = 76) and fish muscle (n = 33) collected at Urrá dam, upstream Sinú river, northwestern Colombia. Based on interviews with study participants, weekly intakes of total mercury (WIT-Hg) and methylmercury (WIMeHg) by fish consumption were also estimated. T-Hg concentrations in hair samples ranged from 0.40 to 24.56 ?g/g dw. The highest concentrations were recorded in children (CH) (2-15 years old, n = 24) with significant differences (p < 0.05) with respect to women of childbearing age (WCHA) (16-49 years old, n = 29) and the rest of the population (RP) (n = 23), which were not significantly different. The highest T-Hg concentrations in muscle tissue were recorded in the carnivorous fish (0.65-2.25 ?g/g wet weight, ww), with significant differences (p < 0.05) compared to non-carnivorous fish (0.16-0.54 ?g/g ww). WIT-Hg recorded the highest values in CH (2.18-50.41 ?g/kg/week), with significant
Revista: Biol Trace Elem Res. 2013 Feb;151(2):187-94
ID: 9
Autor: Paul Cordy , Marcello M. Veiga, Ibrahim Salih, Sari Al-Saadi , Stephanie Console , Oseas Garcia, Luis Alberto Mesa, Patricio C. Velásquez-López , Monika Roeser
Titulo: Mercury contamination from artisanal gold mining in Antioquia, Colombia: The world's highest per capita mercury pollution
Revista: Science of The Total Environment, Volumes 410–411, 1 December 2011, Pages 154–160
ID: 10
Autor: Alvarez S, Jessick AM, Palacio JA, Kolok AS.
Titulo: Methylmercury concentrations in six fish species from two Colombian rivers.
Abstract: The objective of this study was to determine whether fish collected from the La Miel or Nechí Rivers (Colombia) differed in muscle methyl mercury (meHg) concentration. Two fish from six different species were collected from markets adjacent to each river. Overall, fish collected from the market adjacent to the Nechí River contained higher levels of meHg. This result however is being driven by very high meHg concentrations in four individual fish, three of which are Pimelodid, long-whiskered catfish. These catfish may represent ideal sentinel organism for the detection of meHg contamination in Colombian rivers.
Revista: Bull Environ Contam Toxicol. 2012 Jan;88(1):65-8.