Journal
ENVIRONMENTAL POLLUTION
Volume 242, Issue -, Pages 1128-1136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2018.07.104
Keywords
Pb enrichment; Geochemical fractions; Stable Pb isotopes; Coal combustion; Vehicle exhaust
Categories
Funding
- National Natural Science Foundation of China [41701585, 41771027, 41611140112]
- Fundamental Research Fund for the Central Universities of China [17lgpy40]
- the Natural Science Foundation of Guangdong, China [2017A030310309]
- Provincial Special Fund for Economic Development (Marine Economic Development) [GDME-2018E004]
- Scientific and Technological Innovation Project of the Water Sciences Department of Guangdong Province (2018-2021)
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Identifying contamination sources of environmental media and revealing their changing trends over time is useful for regional contamination control and environmental improvements. Four sediment cores (S1-S4) were collected from the Shima River to determine lead (Pb) concentrations, geochemical fractions and isotopic compositions, as well as the geochronology of core S3. The results show that Pb concentrations decreased from the upper and middle reach sites (means: 57.6, 95.9, and 97.6 mg kg(-1), respectively) to the lower reach site (43.8 mg kg(-1)), resulting in a minimal to moderate enrichment in the sediments; enrichment increased due to anthropogenic Pb inputs at the river middle reach site since the 1990s. Sediment Pb in the geochemical fractions followed a decreasing order of reducible (47.3%) > residual (37.8%) > oxidizable (11.2%) > acid-soluble fraction (3.68%), exhibiting high mobility, further verifying the anthropogenic inputs. A descending trend in the Pb-206/Pb-207 ratio of the top sediments was the result of anthropogenic activities. In the present study, coal combustion, which was the major anthropogenic Pb source determined by its isotopic composition, contributed significantly (means: 18.4-60.6%) to sediment Pb based on a three end-members model. Less of a contribution (0-10.6%) was derived from vehicle exhaust. The increasing trend in the coal contribution was in accordance with that of the coal consumption in the study area. These results suggest that Pb contamination resulting from coal combustion has grown to become a major environmental issue in the study area. (C) 2018 Elsevier Ltd. All rights reserved.
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