![]() The heavy metals loaded into the river environment can be transferred to and concentrated in sediments together with organic matter, Fe/Mn oxides, and sulfides by adsorption and accumulation on suspended fine-grained particles, however they cannot be permanently fixed in sediments. Heavy metals in river sediments mainly stem from rock weathering, soil erosion, runoff from agriculture, sewage treatment, and atmospheric precipitation. River sediments have been identified as important carriers and sinks for the heavy metals discharged into the aquatic systems. With recent advances in industrialization and socio-economic development, heavy metal pollution of aquatic systems has become a global issue and has received considerable attention due to high biotoxicity, wide sources, non-biodegradability, and bio-enrichment in food webs. These findings indicate that effective management strategies for sewage discharge should be developed to protect the environmental quality of urban rivers. Industrial discharge was the dominant source for eight heavy metals in the surveyed area, and rural domestic sewage has a stronger influence on the Hg pollution than industrial pollutants. The ecological risk levels of all heavy metals were much higher in the upstream than the midstream and downstream. The potential factors of heavy metal pollution were Cd, Cu, Hg, Zn, and As, especially Cd and Hg with the high ecological risks. The highest concentration of As was midstream, followed by upstream and then downstream, which was different to Cd. The decreasing order of the average concentration of Cd was upstream > midstream > downstream, so were Cr, Cu, Ni and Zn. Ni, Pb, and Cr were close or slightly higher than their background values. This indicated that these heavy metals were derived from the upstream areas where a large quantity of effluents from the wastewater treatment plants enter the river. The average concentrations of the As, Cd, Cu, Hg, and Zn were significantly higher than their background values in soils in the region, and mainly gathered at 0–120 cm in depth in the upstream, 0–60 cm in the midstream, and 0–20 cm downstream. Eight heavy metals, namely Pb, Zn, As, Cd, Cr, Cu, Ni, and Hg, were measured for each layer in this study. The concentrations of the As, Cd, Cr, Cu, Hg, Ni, Pb and Zn were measured for each layer. Then they were divided into 10 layers (20 cm each layer). Sediment cores of 200 cm in depth were taken using a drilling platform at 10 sampling sites along the Xihe River, an urban river located in western Shenyang City, China. Canonical correlation analysis (CCA), principal component analysis (PCA), and potential ecological risk index (PERI) have been applied to heavy metal data to trace potential factors, identify regional differences, and evaluate ecological risks. Kindly check the guidelines above to determine whether your manuscript is within the scope of the journal if yes, please go ahead and submit it.Heavy metal pollution of aquatic systems is a global issue that has received considerable attention. Please DO NOT ask the Editors-in-Chief for permission before submitting a manuscript. Water pollution control and Water security.Resource-Energy recovery during pollution control.Marine, freshwater and terrestrial ecosystems.Indoor and outdoor air pollution control.Environmental risks assessment and management.Environmental functional materials for pollution control.Environmental and occupational medicine.Biomonitoring and adverse/toxic health effects.Contaminant behaviour and environmental processes. ![]() Biotransformation and environmental fate.Bioconcentration, bioaccumulation and biomagnification.Air, soil, water and biota chemical pollutants and health.Coverage includes, but is not limited to, the following research topics and areas: Aims & Scope Cross Environmental Research is a multi-disciplinary journal publishing high quality and novel information about anthropogenic issues of global relevance and applicability in a wide range of environmental disciplines, and demonstrating environmental application in the real-world context.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |