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首页> 外文期刊>The Science of the Total Environment >Behavior of selected micro and trace elements and organic matter in sediments of a freshwater system in south-east Brazil
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Behavior of selected micro and trace elements and organic matter in sediments of a freshwater system in south-east Brazil

机译：巴西东南部淡水系统沉积物中某些微量元素和有机物的行为

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摘要

The Cima Lake (CL) is a freshwater system located in the Northern Region of Rio de Janeiro State. It has a history of agricultural and cattle raising activities. The original Atlantic forest has been deforested and replaced by pasture and sugar cane crops. The objectives of this study were to understand the vertical distribution of organic matter and heavy metals associated with lacustrine sediments and to evaluate the influence of land use on the relative contribution of organic matter sources and heavy metals to the lake sediments. For these purposes, sediment cores were collected at three stations: inlet, center and outlet of the CL. It was possible to date sediments buried over the last 150 years. The results revealed that the changes caused by human intervention in the CL watershed influenced sediment sources and composition, and led to increasing sedimentation rates over the past century. The (C/N)a ratios ranged between 5.7 and 47.4 and showed that between the 1950s and 1960s there was an alteration in the sources of organic matter to CL sediments, indicating a period marked by the expansion of sugar-cane and alcohol industries in the region and an intense deforestation in the lake watershed. The heavy metal concentrations obtained in this study were similar to those described for natural systems, in spite of the system being influenced by anthropogenic sources. The Me~+ /Ti ratios indicate the existence of human intervention processes in the lake, showing that the origin of metals is not only from natural processes.
机译：奇马湖（CL）是位于里约热内卢州北部地区的淡水系统。它有农业和养牛活动的历史。原始的大西洋森林已被砍伐，并由牧场和甘蔗作物取代。这项研究的目的是了解与湖泊沉积物有关的有机物和重金属的垂直分布，并评估土地利用对有机物源和重金属对湖泊沉积物相对贡献的影响。为此，在三个站点收集沉积物芯：CL的入口，中心和出口。在过去150年中，有可能对埋藏的沉积物进行了测年。结果表明，在过去的一个世纪中，人为干预CL流域所引起的变化影响了沉积物的来源和组成，并导致沉积速率增加。 （C / N）a比值介于5.7和47.4之间，表明1950年代和1960年代之间，CL沉积物的有机物来源发生了变化，这表明甘蔗和酒精工业在2006年开始扩张。该地区以及湖泊流域的严重森林砍伐。尽管该系统受人为来源的影响，但本研究中获得的重金属浓度与天然系统中所述的浓度相似。 Me〜+ / Ti比值表明湖中存在人类干预过程，这表明金属的来源不仅来自自然过程。

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