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首页> 外文期刊>Marine pollution bulletin >Determination of geochemical background values on a tropical estuarine system in a densely urban area. Case study: Capibaribe estuary, Northeastern Brazil
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Determination of geochemical background values on a tropical estuarine system in a densely urban area. Case study: Capibaribe estuary, Northeastern Brazil

机译：在人口密集地区的热带河口系统中确定地球化学背景值。案例研究：巴西东北部Capibaribe河口

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This study aims to infer the background values of several metals in the Capibaribe estuary and to identify the likely impact of anthropic activities during 200-years of sedimentation. Two cores were sampled, with sub samples at intervals of 2 cm. Sedimentation rates and metal concentrations were analyzed. The Al-normalized method was used to infer the background values, and to identify anthropic influences, the enrichment factor, the contamination factor and the geoaccumulation index were employed. The background values showed concentrations for Mn of 292.2, for Co of 10.4, for Ni of 22.3, for Cu of 60.8, for Zn of 105.5, for As of 106.0, for Pb of 52.9 (all in mgkg(-1)) and for Fe of 2.7%, The higher values, mainly for As, Zn and Pb, are associated with the influence of the Barreiras Formation. The geogenic inputs are significantly greater than the anthropic activities, masking the contamination.
机译：这项研究旨在推断Capibaribe河口几种金属的背景值，并确定人类活动在沉积200年期间的可能影响。采样了两个核心，每个子样本间隔为2 cm。分析了沉积速率和金属浓度。采用Al归一化方法推断背景值，并确定人为影响，采用了富集因子，污染因子和地积累指数。背景值显示Mn的浓度为292.2，Co的浓度为10.4，Ni的浓度为22.3，Cu的浓度为60.8，Zn的浓度为105.5，As的浓度为106.0，Pb的浓度为52.9（均以mgkg（-1）为单位）和Fe为2.7％。较高的值（主要是As，Zn和Pb）与Barreiras组的影响有关。地源投入明显大于人类活动，掩盖了污染。

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