Department of Chemistry, University of Lagos Akoka-Yaba, Lagos, Nigeria.
Environ Monit Assess. 2013 Mar;185(3):2167-77. doi: 10.1007/s10661-012-2697-7. Epub 2012 May 25.
Surface sediments collected from the Lagos Lagoon, Nigeria, and three adjoining rivers were analysed for their physicochemical properties and pseudo-total concentration of the potentially toxic metals (PTM) Cd, Cr, Cu, Pb and Zn. The concentration of the PTM varied seasonally and spatially. Odo-Iyaalaro was observed to be the most polluted river, with highest concentrations of 42.1 mg kg(-1), 102 mg kg(-1), 185 mg kg(-1), 154 mg kg(-1) and 1040 mg kg(-1) of Cd, Cr, Cu, Pb and Zn, respectively, while Ibeshe River was the least contaminated, apart from a site affected by Cu from the textile industry. Some of the sediments were found to be above the consensus-based probable effect concentrations and Dutch sediment guideline for metals. Overall metal concentrations were similar to those reported for other tropical lagoon and estuarine systems affected by anthropogenic inputs as a result of rapid urbanisation. Due to the large number of samples, principal component analysis was used to examine relationships within the data set. Generally, sediments collected during the dry season were observed to have higher concentration of PTM than those collected during the rainy season. This means that PTM could accumulate over a prolonged period and then be released relatively rapidly, on an annual basis, into tropical lagoon systems.
从尼日利亚拉各斯泻湖和三条毗邻的河流中采集的表层沉积物，对其理化性质和潜在有毒金属（PTM）Cd、Cr、Cu、Pb 和 Zn 的总浓度进行了分析。PTM 的浓度具有季节性和空间变化。观察到 Odo-Iyaalaro 是污染最严重的河流，Cd、Cr、Cu、Pb 和 Zn 的浓度分别为 42.1mgkg-1、102mgkg-1、185mgkg-1、154mgkg-1 和 1040mgkg-1，而 Ibeshe 河除了受到纺织工业 Cu 影响的一个地点外，污染程度最低。一些沉积物的含量高于基于共识的可能效应浓度和荷兰金属沉积物指南。总体金属浓度与其他受人为输入影响的热带泻湖和河口系统的报告浓度相似，这是由于快速城市化的结果。由于样本数量众多，因此使用主成分分析来检查数据集中的关系。通常，在旱季采集的沉积物中 PTM 的浓度高于雨季采集的沉积物。这意味着 PTM 可能会在较长时间内积累，然后在每年的基础上相对较快地释放到热带泻湖系统中。
