Speciation and phytoavailability of heavy metals in sediments in Nanjing section of Changjiang River |
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| Authors: | Hongrui Ma Li Hua Junfeng Ji |
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| Affiliation: | (1) College of Resource and Environment, Shaanxi University of Science and Technology, 710021 Xi’an, China;(2) State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Institute of Surficial Geochemistry, Nanjing University, 210093 Nanjing, China; |
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| Abstract: | Heavy metal pollution and their fractionations in the sediments of Changjiang River in Nanjing Reach was monitored for cadmium (Cd), lead (Pb), zinc (Zn), chromium (Cr), and copper (Cu). Moreover, the biological enrichment of metals by riverine plants was studied. The results demonstrated there were highly significant variations among different sampling stations for the concentrations of tested metals. The highest range was for Cu (38.8–120.4 mg kg−1), followed by Cr (74.4–120.0 mg kg−1), Zn (80.9–121.1 mg kg−1), Ni (26.0–55.5 mg kg−1), Pb (15.8–46.7 mg kg−1) and Cd (0.28–0.48 mg kg−1). Cd was the element with highest biological enrichment factor (BEF). The highest BEF of Cd in Erigeron bonariensis reached 3.0, indicating a significant Cd enrichment in this aquatic plant. In addition, 60% of Cd was found in reducible fraction and exchangeable and acid-soluble fraction, which was consistent with its high mobility. The consistency of Cd fraction in sediment and suspended particle indicated they came from the same source. Accumulated Cd concentration calculated according to the release curve showed significant relativity with the total Cd concentration in the sediment. |
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