Pollution history of heavy metals on the Portuguese shelf using 210Pb-geochronology

2006 ◽  
Vol 367 (1) ◽  
pp. 466-480 ◽  
Author(s):  
M. Mil-Homens ◽  
R.L. Stevens ◽  
W. Boer ◽  
F. Abrantes ◽  
I. Cato
Keyword(s):  
Heavy Metals ◽  
Pollution History ◽  
History Of ◽  
210Pb Geochronology

Ecological risk and pollution history of heavy metals in Nansha mangrove, South China

2014 ◽  
Vol 104 ◽  
pp. 143-151 ◽  
Author(s):  
Qihang Wu ◽  
Nora F.Y. Tam ◽  
Jonathan Y.S. Leung ◽  
Xizhen Zhou ◽  
Jie Fu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Ecological Risk ◽  
South China ◽  
Pollution History ◽  
History Of

scholarly journals Ecological Risk Assessment and Contamination History of Heavy Metals in the Sediments of Chagan Lake, Northeast China

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 894
Author(s):  
Panfeng Liu ◽  
Chaojie Zheng ◽  
Meilan Wen ◽  
Xianrong Luo ◽  
Zhiqiang Wu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Principal Component Analysis ◽  
Ecological Risk ◽  
Surface Sediment ◽  
Northeast China ◽  
Principal Component ◽  
Potential Ecological Risk ◽  
210Pb Dating ◽  
History Of ◽  
Chagan Lake

The study deals with the spatio-temporal distribution of heavy metals in the sediments of Chagan lake, Northeast China. The pollution history of heavy metals is studied simultaneously through the 210Pb dating method by analyzing the characteristic of As, Hg, Cd, Cr, Ni, Cu, Pb, and Zn concentration-depth profiles. The potential ecological risk index (RI) and geo-accumulation index (Igeo) were used to evaluate the contamination degree. Principal component analysis (PCA), based on the logarithmic transformation and isometric log-ratio (ilr) transformed data, was applied with the aim of identifying the sources of heavy metals. The element concentrations show that the heavy metals are enriched in the surface sediment and sediment core with a varying degree, which is higher in the surficial residue. The results of Igeo indicate that the Cd and Hg in the surface sediment have reached a slightly contaminated level while other elements, uncontaminated. The results of RI show that the study area can be classified as an area with moderate ecological risk in which Cd and Hg mostly contribute to the overall risk. For the sediment core, the 210Pb dating results accurately reflect the sedimentary history over 153 years. From two evaluation indices (RI and Igeo) calculated by element concentration, there is no contamination, and the potential ecological risk is low during this period. The comparative study between raw and ilr transformed data shows that the closure effect of the raw data can be eliminated by ilr transformation. After that, the components obtained by robust principal component analysis (RPCA) are more representative than those obtained by PCA, both based on ilr transformed dataset, after eliminating the influence of outliers. Based on ilr transformed data with RPCA, three primary sources could be inferred: Cr, Ni, As, Zn, and Cu are mainly derived from natural sources; the main source of Cd and Hg are associated with agricultural activities and energy development; as for Pb, it originated from traffic and coal-burning activities, which is consistent with the fact that the development of tourism, fishery, and agriculture industries has led to the continuous increasing levels of anthropogenic Pb in Chagan Lake. The summarized results and conclusions will undoubtedly enhance the governmental awareness of heavy metal pollution and facilitate appropriate pollution control measures in Chagan Lake.

scholarly journals CONCENTRATION OF HEAVY METALS IN WATER FLOWS IN THE AREA OF UNALSKY TAILING DUMP AND ARDON RIVER

2018 ◽  
Vol 13 (2) ◽  
pp. 113-122 ◽  
Author(s):  
Dzerassa N. Chigoeva ◽  
Inna Z. Kamanina ◽  
Svetlana P. Kaplina
Keyword(s):  
Heavy Metals ◽  
Production Capacity ◽  
Chemical Pollution ◽  
Environmental Disaster ◽  
Tailing Dump ◽  
Maximum Permissible Concentrations ◽  
History Of ◽  
Lead Zinc ◽  
Domestic Use ◽  
Cadmium Lead

The long history of development of deposits of lead-zinc ores of the Sadonsky mining region led to the formation of extensive halos of chemical pollution of surface watercourses. Aim. The aim of this study is to monitor surface watercourses in the area of the Unalsky tailing dumps and the Kholst deposit by points of sampling of 1992-2004. Sampling was conducted in the summer of 2016. Methods. The content of heavy metals of 2 and 3 hazard classes (Pb, Cd, Ni, Zn and Cu) was studied by atomic absorption. The contribution of the Unaldon River and Unalsky tailing dump to the pollution of the Ardon River. Results. The highest content of cadmium, lead and zinc, significantly exceeding the maximum permissible concentrations (MPC) in the water bodies of cultural and domestic use is found in the Ardon River down from the Unalsky tailing dump. The flow of heavy metals into the Unaldon River with adit waters compared with the observation period of 1992-2004 decreased noticeably. In conditions of a reduction in the production capacity of mining and processing enterprises, the leaching of heavy metals from mountain dumps and excavations make an insignificant contribution to the pollution of the Ardon River in comparison with the Unalsky tailing dump. Conclusion. The state of the Ardon River down from the discharge from the tailing dump corresponds to the "environmental disaster" category. The condition of the rivers Mayramdon and Unaldon according to the content of heavy metals corresponds to a "relatively satisfactory" type.

Ecological risk and contamination history of heavy metals in the Andong tidal flat, Hangzhou Bay, China

2017 ◽  
Vol 23 (3) ◽  
pp. 617-640 ◽  
Author(s):  
Aimin Jin ◽  
Lin Yang ◽  
Xue-Gang Chen ◽  
Pei-Sun Loh ◽  
Zhanghua Lou ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Ecological Risk ◽  
Tidal Flat ◽  
Hangzhou Bay ◽  
History Of ◽  
Contamination History

Pollution history of Narragansett Bay as recorded in its sediments

1977 ◽  
Vol 5 (4) ◽  
pp. 549-561 ◽  
Author(s):  
Edward D. Goldberg ◽  
Eric Gamble ◽  
John J. Griffin ◽  
Minoru Koide
Keyword(s):  
Narragansett Bay ◽  
Pollution History ◽  
History Of

scholarly journals Biological risk and pollution history of polycyclic aromatic hydrocarbons (PAHs) in Nansha mangrove, South China

2014 ◽  
Vol 85 (1) ◽  
pp. 92-98 ◽  
Author(s):  
Qihang Wu ◽  
Jonathan Y.S. Leung ◽  
Nora F.Y. Tam ◽  
Shejun Chen ◽  
Bixian Mai ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
South China ◽  
Aromatic Hydrocarbons ◽  
Pollution History ◽  
Biological Risk ◽  
Polycyclic Aromatic ◽  
History Of
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