Human and Ecological Risk Assessment an International Journal, Mar 14, 2014
ABSTRACT This study evaluated the risk to human health from mercury exposure through fish consump... more ABSTRACT This study evaluated the risk to human health from mercury exposure through fish consumption in three riverside populations: Children (CH, 2–15 years old), women of childbearing age (WCHA, 16–49 years old), and the rest of the population (RP) from the Urrá reservoir area, Colombia. Questionnaire-based surveys were used to collect data and information about the weekly amount of fish consumed (WAFC) and the relative importance of each fish species in the diet of the study participants. There were no significant differences in WAFC between population groups. CH recorded the highest weekly intake of total Hg (WIT-Hg) (0.6–55.4 μg/kg bodyweight/week), with significant differences (p Keywords: fish consumption; human health; mercury; risk assessment; weekly intake Document Type: Research Article DOI: http://dx.doi.org/10.1080/10807039.2013.862068 Affiliations: 1: Water, Applied and Environmental Chemistry Group, University of Córdoba, Montería, Colombia 2: 2Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, Spain Publication date: September 3, 2014 $(document).ready(function() { var shortdescription = $(".originaldescription").text().replace(/\\&/g, '&').replace(/\\, '<').replace(/\\>/g, '>').replace(/\\t/g, ' ').replace(/\\n/g, ''); if (shortdescription.length > 350){ shortdescription = "" + shortdescription.substring(0,250) + "... more"; } $(".descriptionitem").prepend(shortdescription); $(".shortdescription a").click(function() { $(".shortdescription").hide(); $(".originaldescription").slideDown(); return false; }); }); Related content In this: publication By this: publisher By this author: Ruiz-Guzmán, Javier Alonso ; Marrugo-Negrete, José Luis ; Díez, Sergi GA_googleFillSlot("Horizontal_banner_bottom");
Determination of the dissolved-bioavailable fraction of methylmercury (MeHg) and its degradation ... more Determination of the dissolved-bioavailable fraction of methylmercury (MeHg) and its degradation pathways in freshwaters deserve attention, to further our understanding of the potential risk and toxicity of MeHg. Since the photodegradation of MeHg is the most important known abiotic process able to demethylate MeHg, this study investigated the role of sunlight on MeHg bioavailability in freshwater environments. Experiments to calculate photodegradation rate constants of MeHg in different types of freshwater in combination with experiments to distinguish the labile fraction of MeHg after being exposed to sunlight were performed. The ability of diffusive gradients in thin films based on polyacrylamide (P-DGT) to assess DGT-labile MeHg during photodegradation was successfully tested. First order photodegradation rate constants (kpd) of bioavailable MeHg determined in five different types of waters with different amount of dissolved organic matter (DOM), were in the range 0.073-0.254h(-...
Mercury (Hg) speciation and bioavailability were studied in surface sediments affected by artisan... more Mercury (Hg) speciation and bioavailability were studied in surface sediments affected by artisanal and small-scale gold mining (ASGM) in the Mojana region of Colombia. The results demonstrated higher levels in sampling stations that receive water streams carrying Hg from mining areas. The T-Hg concentrations were slightly elevated with values between 196.2 and 1187.6 ng g(-1) dry weight (dw) (mean 524.2±256.8 ng g(-1) dw). The MeHg concentrations were significantly correlated with the T-Hg and organic matter (OM) and represent between 1.7% and 3.6% (mean: 2.6%) of the T-Hg. A five-step sequential extraction procedure shown that most of T-Hg in sediments occur primarily as organically bound Hg (Hg-o), which constitutes 48.4% of the T-Hg, followed by elemental Hg fraction (Hg-e) bound to amorphous compounds, such as Fe/Mn oxides with 26.5%, and the fraction bound to sulfur (Hg-s), which constitutes 18.7%. Exchangeable Hg (Hg-w; water-soluble Hg and stomach acid soluble mercury; Hg-h) represents between 1.7% and 4.7%. These fractions constitute a low percentage but exhibit a high level of risk when entering the water column, and they can bioaccumulate in organisms. The significant relationship between OM, T-Hg and MeHg suggests an important role in the control of the distribution, mobility and bioavailability of the Hg in the sediments.
Human and Ecological Risk Assessment an International Journal, Mar 14, 2014
ABSTRACT This study evaluated the risk to human health from mercury exposure through fish consump... more ABSTRACT This study evaluated the risk to human health from mercury exposure through fish consumption in three riverside populations: Children (CH, 2–15 years old), women of childbearing age (WCHA, 16–49 years old), and the rest of the population (RP) from the Urrá reservoir area, Colombia. Questionnaire-based surveys were used to collect data and information about the weekly amount of fish consumed (WAFC) and the relative importance of each fish species in the diet of the study participants. There were no significant differences in WAFC between population groups. CH recorded the highest weekly intake of total Hg (WIT-Hg) (0.6–55.4 μg/kg bodyweight/week), with significant differences (p Keywords: fish consumption; human health; mercury; risk assessment; weekly intake Document Type: Research Article DOI: http://dx.doi.org/10.1080/10807039.2013.862068 Affiliations: 1: Water, Applied and Environmental Chemistry Group, University of Córdoba, Montería, Colombia 2: 2Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Barcelona, Spain Publication date: September 3, 2014 $(document).ready(function() { var shortdescription = $(".originaldescription").text().replace(/\\&/g, '&').replace(/\\, '<').replace(/\\>/g, '>').replace(/\\t/g, ' ').replace(/\\n/g, ''); if (shortdescription.length > 350){ shortdescription = "" + shortdescription.substring(0,250) + "... more"; } $(".descriptionitem").prepend(shortdescription); $(".shortdescription a").click(function() { $(".shortdescription").hide(); $(".originaldescription").slideDown(); return false; }); }); Related content In this: publication By this: publisher By this author: Ruiz-Guzmán, Javier Alonso ; Marrugo-Negrete, José Luis ; Díez, Sergi GA_googleFillSlot("Horizontal_banner_bottom");
Determination of the dissolved-bioavailable fraction of methylmercury (MeHg) and its degradation ... more Determination of the dissolved-bioavailable fraction of methylmercury (MeHg) and its degradation pathways in freshwaters deserve attention, to further our understanding of the potential risk and toxicity of MeHg. Since the photodegradation of MeHg is the most important known abiotic process able to demethylate MeHg, this study investigated the role of sunlight on MeHg bioavailability in freshwater environments. Experiments to calculate photodegradation rate constants of MeHg in different types of freshwater in combination with experiments to distinguish the labile fraction of MeHg after being exposed to sunlight were performed. The ability of diffusive gradients in thin films based on polyacrylamide (P-DGT) to assess DGT-labile MeHg during photodegradation was successfully tested. First order photodegradation rate constants (kpd) of bioavailable MeHg determined in five different types of waters with different amount of dissolved organic matter (DOM), were in the range 0.073-0.254h(-...
Mercury (Hg) speciation and bioavailability were studied in surface sediments affected by artisan... more Mercury (Hg) speciation and bioavailability were studied in surface sediments affected by artisanal and small-scale gold mining (ASGM) in the Mojana region of Colombia. The results demonstrated higher levels in sampling stations that receive water streams carrying Hg from mining areas. The T-Hg concentrations were slightly elevated with values between 196.2 and 1187.6 ng g(-1) dry weight (dw) (mean 524.2±256.8 ng g(-1) dw). The MeHg concentrations were significantly correlated with the T-Hg and organic matter (OM) and represent between 1.7% and 3.6% (mean: 2.6%) of the T-Hg. A five-step sequential extraction procedure shown that most of T-Hg in sediments occur primarily as organically bound Hg (Hg-o), which constitutes 48.4% of the T-Hg, followed by elemental Hg fraction (Hg-e) bound to amorphous compounds, such as Fe/Mn oxides with 26.5%, and the fraction bound to sulfur (Hg-s), which constitutes 18.7%. Exchangeable Hg (Hg-w; water-soluble Hg and stomach acid soluble mercury; Hg-h) represents between 1.7% and 4.7%. These fractions constitute a low percentage but exhibit a high level of risk when entering the water column, and they can bioaccumulate in organisms. The significant relationship between OM, T-Hg and MeHg suggests an important role in the control of the distribution, mobility and bioavailability of the Hg in the sediments.
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