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首页> 外文期刊>Lakes & Reservoirs >Comparative spatial metal concentrations and partitioning in bottom sediments of two tropical freshwater lake basins, Kenya
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Comparative spatial metal concentrations and partitioning in bottom sediments of two tropical freshwater lake basins, Kenya

机译：肯尼亚两个热带淡水湖盆地底部沉积物中空间金属浓度和分区的比较

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摘要

Metal concentrations in the water, sediments and biota in alkaline, near neutral water tropical freshwater lake basins were determined and a comparative analysis made on the spatial and accumulated trace metal concentrations, and geo-chemical partitioning of iron (Fe), manganese (Mn), copper (Cu), chromium (Cr), zinc (Zn), nickel (Ni), cadmium (Cd) and lead (Pb) in bottom lake sediments. Variable accumulated levels were found in the analysed sediments and aquatic biological tissues. Metal partitioning data in the present study from the two areas exhibits similar trends in magnitude. The residual fractions retained relatively higher amounts of metals. Relatively higher contents of Pb, Cr and Cu were found in Lake Victoria sediments. Cd, Ni, Mn and Pb are of concern because a higher percentage of these metals were retained in the more bioavailable fractions in Lake Naivasha. Total levels of sediment mercury were comparable for the two lake basins. Metals were found in significant levels in the tissues of aquatic organisms, highlighting the potential risks to other levels within the aquatic food chain. Although the exposure risk was not evaluated, it is important to continue monitoring these elements in fish, as sediments were found to contain considerable quantities of the metals. Numerous sediment extraction techniques data applied for evaluating metal partitioning in sediments cannot be compared because of the use of different methods. Nevertheless, the information is still useful in differentiating and understanding pollution loads from natural versus anthropogenic sources and their associated risks.
机译：确定了碱性，近中性水热带淡水湖盆地中水，沉积物和生物区系中的金属浓度，并对空间和累积的痕量金属浓度以及铁（Fe），锰（Mn）的地球化学分配进行了比较分析。 ，湖泊底部沉积物中的铜（Cu），铬（Cr），锌（Zn），镍（Ni），镉（Cd）和铅（Pb）。在分析的沉积物和水生生物组织中发现了可变的积累水平。在本研究中，来自这两个地区的金属分区数据显示出相似的趋势。残留部分保留相对较高数量的金属。在维多利亚湖沉积物中发现铅，铬和铜的含量相对较高。 Cd，Ni，Mn和Pb是令人关注的，因为在奈瓦夏湖中，较高百分比的这些金属保留在生物利用率更高的馏分中。这两个湖盆的沉积物汞总含量相当。在水生生物组织中发现大量金属，突显了对水生食物链其他水平的潜在风险。尽管未评估暴露风险，但重要的是继续监测鱼类中的这些元素，因为发现沉积物中含有大量的金属。由于使用了不同的方法，因此无法比较用于评估沉积物中金属分配的众多沉积物提取技术数据。尽管如此，这些信息仍然有助于区分和理解自然与人为污染源的污染负荷及其相关风险。

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