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Indexed by:期刊论文

Date of Publication:2017-08-01

Journal:ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

Included Journals:SCIE、PubMed、Scopus

Volume:142

Page Number:454-463

ISSN No.:0147-6513

Key Words:Heavy metals; Sediment cores; Deposition behavior; Risk assessment; Source identification

Abstract:Sediment cores from five reservoirs, located in the Liaoning and Jilin Provinces in Northeast China, were collected to investigate the accumulation and potential toxicity of heavy metals (Fe, Mn, Cu, Cd, Pb, Zn, and Cr) during a sampling campaign in February, 2015. The results showed that all the detected metals accumulated significantly, especially Cd, compared to their respective background values. Among these reservoirs, Biliuhe Reservoir had markedly increasing trends for organic matter and all the metals, among which Mn was elevated by 280% to 3411 mg/kg in a core of only 18 cm in depth. Xinlicheng Reservoir was characterized by heavy siltation and varying metal distribution due to its regular geometric features and pulsed flood events. The Enrichment factor (EF) and geo-accumulation index (I-gee) indicated Cd was strongly enriched by anthropogenic inputs, with the values of EF and I-gee greater than 8 and 3, respectively. The toxicity assessment calculated using consensus-based sediment quality guidelines (SQGs) implied the whole cores of Tanghe and Dahuofang and the upper cores of Biliuhe, Xinlicheng and Fengman exhibited toxicity to sediment-dwelling organisms. Cr contributed more to Q(m.pEc) than the other heavy metals, because only Cr exceeded the probable effect concentration (PEC) despite its low enrichment. According to the results of correlation analysis (CA) and principal components analysis (PCA), mining industries and agricultural activities within the basin were the main anthropogenic pollution sources for these heavy metals.