Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 532, Issue -, Pages 645-654Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.06.035
Keywords
Heavy metals; Sediment cores; Pb-210 dating; Contamination history; Mining region; Hejiang River
Categories
Funding
- National Key Basic Research Program of China [2013CB956102]
- Guangxi Natural Science Fund Project [2013GXNSFEA053001]
- BaGui Scholars Program Foundation
- NSFC [41473118, 41273139]
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Historical levels of Pb, Zn, Cd, Cr, Cu, Ni, As, Fe, Al and Mn were found in C1 and C2 sediment cores from the Hejiang River, which is located in a typical mining region of Southern China, the levels date back approximately 57 and 83 years. Temporal variations in the core C1 around the mining peaked in the 1960s, after which they exhibited a decreasing trend, which reflects successful government management. Historical events such as the Pacific War and China's first 5-year economic plan were recorded in core C2, which was collected from the downstream portion of the Hejiang River. Enrichment factors (EF), geo-accumulation (I-geo), and excess flux indicate that severe contamination occurred during the period between 1956 and 1985 due to the release of high amounts of mining waste from human activities around the core C1 region. The highest EF value was displayed by As (67); this was followed by Pb (64), Cd (39), and Zn (35). In contrast, the core C2 sediments exhibited minor pollution because of dilution from tributaries (the Fu River and the Daning River) that do not flow through the mined area and because C2 was farther from the source of the metals. The results of the risk assessment codes (RAC) for both cores indicate that Cd posed a high risk to the local environment. Principal component analysis (PCA) and correlation analysis (CA) revealed that accumulation of heavy metals was mainly due to mining pollution. (c) 2015 Elsevier B.V. All rights reserved.
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