Mercury concentrations in water, sediment, and biota from Lake Victoria, East Africa
Mercury concentrations in water, sediment, and biota from Lake Victoria, East Africa
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DOI：
10.1016/s0380-1330(03)70555-3
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发表时间：
2003-01-01
影响因子：
2.2
通讯作者：
Campbell, LM
中科院分区：
文献类型：
--
作者：
Ramlal, PS;Bugenyi, FWB;Campbell, LM
东非的维多利亚湖是世界上淡水渔业产量最高的地方。2岁以上和3岁以上的尼罗河鲈鱼（Lates niloticus）是目前渔业的最大组成部分，其肌肉组织中的汞含量为90至250纳克/克湿重。这与报道的劳伦森五大湖商业鱼肌肉中的汞含量范围相似（140至320纳克/克）。水柱中平均总汞含量（7.5 ng Hg/L; n = 14）处于未污染水通常定义的上限（< 10 ng Hg/L）。沉积物顶部10 cm固相汞的平均浓度为220 ng Hg/g，与劳伦森五大湖表层沉积物的汞浓度接近。除了水葫芦（Eichhornia crassipes）根部附近的水外，在各种湿地植被附近的地表水中测量的甲基汞含量都很低。虽然鱼类中的汞含量在粮农组织/世卫组织公认的指导方针范围内，但居住在湖泊附近的人可能比居住在远离湖泊的人消耗更多的鱼。重要的是要教育维多利亚湖鱼类的消费者了解任何潜在的风险，并监测鱼类的汞含量。
Lake Victoria, East Africa, is the site of the world's most productive freshwater fishery. Mercury in muscle tissue of the 2+ and 3+ year old Nile perch (Lates niloticus), presently the largest constituent of the fishery, was 90 to 250 ng/g wet weight. This is similar to the range of mercury in fish muscle reported for the commercial fish of the Laurentian Great Lakes (140 to 320 ng/g). The average total mercury in the water column (7.5 ng Hg/L; n = 14) was at the upper range normally defined for uncontaminated water (< 10 ng Hg/L). The average mercury concentration in the solid phase of the top 10 cm of sediments was 220 ng Hg/g close to that found in the surface sediments of the Laurentian Great Lakes. Methylmercury measured in the surface water near a variety of wetland vegetation was low with the possible exception of water collected near the roots of the water hyacinth, Eichhornia crassipes. Although the levels of mercury in fish are within the accepted guidelines of the FAO/WHO, the people living in the vicinity of the lake are likely to consume a greater quantity of fish than those living some distance away from the lake. It is important to educate the consumers of the fish from Lake Victoria about any potential risks and to monitor the fish mercury levels.