Speciation and phytoavailability of heavy metals in sediments in Nanjing section of Changjiang River
- 223 Downloads
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.
KeywordsHeavy metal Speciation Sediment Phytoavailability
This study was partially supported by Natural Science Fund of Jiangsu province (BK2004091), Project of Shaanxi Education Department (07JK187). We are appreciating to Dr. Murray B. McBride for his help in improving the English of our manuscript.
- Alloway BJ (1995) Heavy metals in soils, 2nd edn. Blackie, GlasgowGoogle Scholar
- Cai SM, Du Y, Zeng YH (2002) Main problems of the water and soil environment in middle and lower reaches of Yangtze River and possible countermeasures. Resour Environ 11(6):564–568Google Scholar
- Gaillardet J (2003) Trace elements in river water. In: Drever JI, Holland HD, Turekian KK (eds) Surface and ground water, weathering, and soils. Treatise on geochemistry, vol 5. Elsevier, Oxford, pp 225–272Google Scholar
- Kabata-Pendias A, Pendias H (2001) Trace elements in soils and plants. CRC Press, Boca RatonGoogle Scholar
- Ure AM, Quevauviller P, Munteau H, Griepink B (1993) Speciation of heavy metals in soils and sediments—an account of the improvement and harmonization of extraction techniques undertaken under the auspices of the BCR of the commission of the European Communities. Int J Environ Anal Chem 51:135–151CrossRefGoogle Scholar