这项研究的重点是赛达盆地的现状污染,阿尔及利亚西北部的一个半干旱地区。通过分析沉积物,这项研究提供了关于城市污染及其环境影响的有趣结果。本研究主要包括两个阶段,每个都涉及污染的不同方面。在第一阶段,采用不同的污染指标分析城市排水沉积物中的重金属和有机污染物。将结果与沉积物质量指南进行比较,监管门槛,以及本地和国际参考。大多数金属污染物超过了大陆地壳和沉积物质量准则确定的毒性水平,暗示是人为的起源。此外,污染指数显示出显著的积累。在这种情况下,结果强调了城市沉积物中积累和运输过程的重要性。水文参数显著影响重金属分布机制。铜(Cu)和铅(Pb)之间的显着变化表明在运输过程中存在组合或单一来源。相反,铬(Cr),镍(Ni),铁(Fe)主要来自天然岩性来源。镉(Cd)与与磷肥的农业使用有关的人为来源有关,而锌(Zn)主要来自物理腐蚀过程。在第二阶段,组合的描述性和多变量统计分析检查了重金属的流动性和分布以及它们与有机物(OM)随时间的关系。Cd出现明显的时间变化,Zn,铜的浓度归因于人类活动。OM和钴(Co)之间存在很强的相关性,Cu和Pb,确认OM在与废物处理相关的特定地球化学条件下吸附这些金属的能力。相反,Zn,Cd,Cr,Ni与OM呈弱相关或负相关,建议不同的来源,包括潜在的农业,工业,自然起源。树状图证实了先前确定的污染物组的存在,提示共同的来源和潜在的共现模式。该分析强调了排水网络作为物理化学反应器在污染物动员中的作用。它强调了沉积物相互作用在城市污染过程中的重要性。最后,提出了确保有效控制和修复污染的建议。实践要点:通过对Saida(阿尔及利亚西北部)城市盆地的沉积物进行分析,提供了有关污染及其环境影响的有用信息。这项研究的结果表明,沉积物中的重金属含量很高,超过毒性限制,和人为来源的证据。金属浓度的时间变化表明人类活动的影响。这项研究使得确定来源成为可能,为了理解流动性和分布,并控制城市沉积物中重金属的污染。排水系统用作分散污染物的途径。
The study focuses on current pollution in the Saïda basin, a semi-arid region in north-western Algeria. By analyzing sediments, the study provides interesting results on urban pollution and its environmental impact. The research consists of two main phases, each addressing different aspects of pollution. In the first phase, different pollution indicators are used to analyze heavy metals and organic pollutants in urban drainage sediments. The results are compared with sediment quality guidelines, regulatory thresholds, and local and international references. Most of the metallic contaminants exceed the toxicity levels established by the continental crust and sediment quality guidelines, suggesting an anthropogenic origin. In addition, contamination indices show significant accumulation. In this context, the results highlight the importance of accumulation and transport processes in urban sediments. Hydrological parameters significantly influence heavy metal distribution mechanisms. Remarkable variations between copper (Cu) and lead (Pb) suggest a combined or singular source during transport. Conversely, chromium (Cr), nickel (Ni), and iron (Fe) are mainly derived from natural lithological
sources. Cadmium (Cd) is associated with anthropogenic
sources related to the agricultural use of phosphate fertilizers, whereas zinc (Zn) is mainly derived from physical corrosion processes. In the second phase, a combined descriptive and multivariate statistical analysis examines the mobility and distribution of heavy metals and their relationships with organic matter (OM) over time. Pronounced temporal variations in Cd, Zn, and Cu concentrations are attributed to human activities. Strong correlations exist between OM and cobalt (Co), Cu and Pb, confirming the ability of OM to adsorb these metals under specific geochemical conditions associated with waste disposal. Conversely, Zn, Cd, Cr, and Ni show weak or negative correlations with OM, suggesting diverse
sources, including potential agricultural, industrial, and natural origins. The dendrogram confirms the existence of previously identified contaminant groups, suggesting common
sources and potential co-occurrence patterns. This analysis highlights the role of the drainage network as a physico-chemical reactor in the mobilization of contaminants. It underlines the importance of sediment interactions in urban pollution processes. Finally, recommendations are proposed to ensure effective pollution control and remediation. PRACTITIONER POINTS: Useful information on pollution and its environmental impact is provided by the analysis of sediments in the urban basin of Saida (NW-Algeria). The results of this study indicate high levels of heavy metals in the sediments, in excess of toxicity limits, and evidence of anthropogenic sources. Temporal variations in metal concentrations indicate the influence of human activities. The study has made it possible to identify the
sources, to understand the mobility and distribution, and to control the contamination by heavy metals in the urban sediments. Drainage system serves as a pathway for dispersing contaminants.