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Mercury Speciation in Fish Tissues from a Mediterranean River Basin: The Tagus River (Central Spain) as a Case Study

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Abstract

An assessment of mercury (Hg) accumulation in fish from the Tagus River aquatic system (central Spain), which has been influenced by pollution from industrial and urban development, was performed. Total Hg (THg), inorganic Hg (IHg), and monomethylmercury (MMHg) were determined in muscle and liver of different fish species, including Cyprinus carpio, Ameiurus melas, and Chondrostoma miegii, sampled from three locations. Although concentrations of THg and Hg species showed wide variability among the fish species, they were also found to be considerably dependent on location and fish tissue. Relative contents of MMHg to THg in muscle varied from 60 to 88%, whereas those found in liver ranged from 7 to 59%. Mean THg concentrations ranged from 126 to 810 ng/g (dry weight [dw]) in liver and from 159 to 1057 ng/g dw in muscle. Therefore, the mean THg concentration in all fish muscle samples was far lower than the maximum residue level recommended by the European Union for fishery products. Nevertheless, the concentrations of Hg in fish muscle reported in this study were somewhat increased compared with other areas geographically distant from most major anthropogenic Hg sources and, in some cases, even greater than those previously reported elsewhere in more polluted areas. In contrast, Hg contents in liver were lower than those found in Hg-contaminated areas, but they were within the range found in other areas exposed to diffuse sources of pollution by Hg. Thus, this article provides an overview of the concentration and distribution of Hg species in fish muscle and liver tissues samples taken from a freshwater system in the Mediterranean River basin.

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Acknowledgments

M. J. Moreno acknowledges the Junta de Comunidades de Castilla-La Mancha for doctoral financial support (D.O.C.M. 08/01/03).

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Authors and Affiliations

  1. Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla–La Mancha, 16071, Ciudad Real, Spain

    J. J. Berzas Nevado

  2. Department of Analytical Chemistry and Food Technology, Faculty of Environmental Sciences, University of Castilla–La Mancha, 45071, Toledo, Spain

    R. C. Rodríguez Martín-Doimeadios, F. J. Guzmán Bernardo, M. Jiménez Moreno, M. J. Patiño Ropero & A. de Marcos Serrano

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  1. J. J. Berzas Nevado
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  2. R. C. Rodríguez Martín-Doimeadios
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  3. F. J. Guzmán Bernardo
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  4. M. Jiménez Moreno
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  5. M. J. Patiño Ropero
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  6. A. de Marcos Serrano
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Correspondence to R. C. Rodríguez Martín-Doimeadios.

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Nevado, J.J.B., Martín-Doimeadios, R.C.R., Bernardo, F.J.G. et al. Mercury Speciation in Fish Tissues from a Mediterranean River Basin: The Tagus River (Central Spain) as a Case Study. Arch Environ Contam Toxicol 61, 642–652 (2011). https://doi.org/10.1007/s00244-011-9666-y

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  • DOI: https://doi.org/10.1007/s00244-011-9666-y

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