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 μg/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 μg/g wet weight, ww), with significant differences (p < 0.05) compared to non-carnivorous fish (0.16–0.54 μg/g ww). WIT-Hg recorded the highest values in CH (2.18–50.41 μg/kg/week), with significant differences (p < 0.05) with respect to WCHA (2.02–23.54 μg/kg/week) and RP (1.09–24.71 μg/kg/week), which were not significantly different. Correlation analysis showed a significant relationship between weekly fish consumption and hair T-Hg in CH (r = 0.37, p < 0.05) and WCHA (r = 0.44, p < 0.05). This association was also observed with the number of days per week with fish consumption in CH (r = 0.37, p < 0.05) and WCHA (r = 0.45, p < 0.05). These results suggest that Hg exposure in people inhabiting the Urrá dam should be carefully monitored, particularly in vulnerable groups such as CH and WCHA.
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The authors thank the University of Cordoba, Montería-Colombia (Grant FCB-03-2007) and The Administrative Department of Science, Technology and Innovation COLCIENCIAS (1112-519-29083), for financial support.
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Marrugo-Negrete, J.L., Ruiz-Guzmán, J.A. & Díez, S. Relationship Between Mercury Levels in Hair and Fish Consumption in a Population Living Near a Hydroelectric Tropical Dam. Biol Trace Elem Res 151, 187–194 (2013). https://doi.org/10.1007/s12011-012-9561-z
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DOI: https://doi.org/10.1007/s12011-012-9561-z