Abstract
The heavy metal (such as Cr, Ni, Cu, Cd, Pb, and Zn) concentration, speciation, and pollution source in 43 sediment samples from the Xiangjiang River were investigated using sequential extraction combined with Pb isotope analysis. Cu, Cd, Pb, and Zn concentrations are higher than their background values, while Cr and Ni concentrations are close to those. Sequential extraction demonstrates that heavy metals have different fractions, showing different bioavailabilities. The w(206Pb)/w(207Pb) ratio increases with decreasing bioavailability in the order of exchangeable<carbonate≈Fe-Mn oxides≈organic<residual (p<0.05). Wastewater, dust, and slag from mining and smelting areas, and the residual Pb are assumed to be the primary anthropogenic and natural sources of Pb, respectively. The percentages of anthropogenic Pb in the exchangeable, carbonate, Fe-Mn oxides, and organic fractions are (91.5±16.7)%, (61.1±13.9)%, (57.4±11.1)%, and (55.5±11.2)%, respectively, suggesting a significant input of anthropogenic Pb in these four fractions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
