Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla-La Mancha, Ciudad Real, Spain.
Arch Environ Contam Toxicol. 2011 Nov;61(4):642-52. doi: 10.1007/s00244-011-9666-y. Epub 2011 Apr 7.
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.
对受工业和城市发展污染影响的塔古斯河水系（西班牙中部）鱼类中的汞（Hg）积累进行了评估。在肌肉和肝脏中测定了不同鱼类物种（包括鲤鱼、黑鲈和圆口铜鱼）中的总汞（THg）、无机汞（IHg）和甲基汞（MMHg）。尽管 THg 和 Hg 物种的浓度在不同鱼类物种之间存在广泛的可变性，但它们也被发现与地点和鱼类组织密切相关。肌肉中 MMHg 与 THg 的相对含量在 60%至 88%之间，而肝脏中的相对含量在 7%至 59%之间。肝脏中 THg 的平均浓度范围为 126 至 810ng/g（干重[dw]），肌肉中 THg 的平均浓度范围为 159 至 1057ng/g dw。因此，所有鱼类肌肉样本中的平均 THg 浓度远低于欧盟对渔获物推荐的最大残留限量。然而，与远离大多数人为 Hg 源的其他地区相比，本研究报告的鱼类肌肉中 Hg 的浓度有所增加，在某些情况下，甚至高于在污染更严重地区以前报告的浓度。相比之下，肝脏中的 Hg 含量低于受 Hg 污染地区的含量，但处于暴露于 Hg 弥散源污染的其他地区的含量范围内。因此，本文概述了从地中海流域淡水系统采集的鱼类肌肉和肝脏组织样本中 Hg 物种的浓度和分布情况。
