The concentrations of 144 polychlorinated biphenyls (PCBs) in the river sediments from Luqiao were analyzed by GC-muECD. The objectives of this study were to understand the contents, spatial distribution and possible sources of PCBs. The Sigma PCBs concentrations detected in the river sediments were in the range of 1.66 to 5 930 ng x g(-1), with a mean of 763 ng x g(-1). Tri-CBs, tetra-CBs and penta-CBs were the primary PCB congeners in all samples, accounting for 2.63%-57.6%, 10.4%-54.6% and 7.82%-46.1%, respectively. Octa-CBs and deca-CBs were the minor PCB congeners in all samples, with the percentages of 0-8.57% and 0-11.0%, respectively. The hierarchical cluster analysis (HCA) showed that 22 samples were mainly polluted by Ar1248, 9 samples were polluted by Ar1254, and 6 samples were contaminated by Ar1016, Ar1232 and Ar1242. The PCBs concentrations found in the present study were at an upper-middle level compared with those in other studies in the world. The PCBs pollution in the present area had a high ecological risk.
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Environ Pollut
December 2024
Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Wuhan 430070, China. Electronic address:
Organoarsenicals are toxic pollutants of global concern, and their environmental geochemical behavior might be greatly controlled by iron (Fe) (hydr)oxides through coprecipitation, which is rarely investigated. Here, the effects of the incorporation of dimethylarsenate (DMAs(V)), a typical organoarsenical, into the ferrihydrite (Fh) structure on the mineral physicochemical properties and Fe(II)-induced phase transformation of DMAs(V)-Fh coprecipitates with As/Fe molar ratios up to 0.0876±0.
View Article and Find Full Text PDFEnviron Res
December 2024
State Key Laboratory of Nuclear Resources and Environment, Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, Jiangxi Provincial Key Laboratory of Genesis and Remediation of Groundwater Pollution, School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang, Jiangxi, 330013, P.R. China.
Reclaimed water plays a pivotal role in addressing water scarcity and pollution. The carbon (C) cycle significantly impacts aquatic ecosystems and water quality, yet the C biogeochemical cycle in nutrient-rich reclaimed water remains enigmatic. This study focuses on reclaimed water, developing a conceptual biogeochemical mass balance model to examine C cycling and assess the C budget in the highly eutrophic Jian and Chaobai rivers.
View Article and Find Full Text PDFJ Environ Manage
December 2024
College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi Province, China; Institute of Soil and Water Conservation, Chinese Academy and Sciences and Ministry of Water Resources, Yangling, 712100, Shaanxi Province, China.
The middle reaches of the Yellow River (MRYR) in China are some of the most severely eroded areas in the world. Knowledge of the changes in sediment yield in the MRYR is of great significance for understanding the impact of human activities on soil erosion and sediment transport. Using data from the MRYR and 13 sub-basins, this study aims to evaluate the actual contributions of human activities to sediment yields and to examine whether the widely used Mann-Kendall test has underestimated this contribution.
View Article and Find Full Text PDFMar Pollut Bull
December 2024
National Institute of Oceanography and Fisheries, NIOF, Cairo, Egypt. Electronic address:
Background: The highly industrialized areas characterize the delta coasts of the world, due to the discharging of large quantity of wastewater into the river estuaries. The entrance of phenolic compounds and PAHs into the aquatic environment has not been sufficiently studied on the Egyptian Mediterranean coast. The article examines the content and ecological risks associated with 11 phenolic compounds and 14 PAHs in the bottom sediments of the Nile River estuaries, the largest river systems that discharged into the Mediterranean Sea.
View Article and Find Full Text PDFSci Rep
December 2024
Theoretical Ecology and Engineering Ecology Research Group, School of Life Sciences, Shandong University, Qingdao, Shandong, China.
Temperature and nutrients are known as crucial drivers for the variations of bacterial community structure and functions in oceans and lakes. However, their significance and mechanisms in influencing the bacterial community structure and function in mountain stream remain unclear. In this study, we investigated the spatiotemporal patterns of the bacterial communities and the main environmental factors in the Taizicheng River, a high-latitude mountainous stream, to reveal the main driving factors for sedimental bacterial communities.
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