The characteristic of Pb isotopic compositions in different chemical fractions in sediments from Three Gorges Reservoir, China

Environmental Pollution
Lanfang HanKe Sun

Abstract

To explore the distribution and sources of Pb within the Three Gorges Reservoir (TGR), Pb concentrations and isotope ratios were measured in sediment cores collected from one mainstream and three tributaries. The results showed that sediments contained an average of 43.54 mg kg(-1) of Pb, roughly 1.6 times higher than the geochemical background concentration. Mainstream sediments showed higher average Pb concentrations but slightly less (206)Pb/(207)Pb and more radiogenic (207)Pb/(208)Pb ratios than all tributaries. Most Pb occurred in reducible phases, with much less in exchangeable and oxidizable fractions; thus, Fe-Mn oxides may be the major sink of anthropogenic Pb. Bi-plots of (206)Pb/(207)Pb versus Pb content, and of (206)Pb/(207)Pb versus (207)Pb/(208)Pb, indicated that coal combustion was the predominant anthropogenic Pb source for exchangeable, reducible, and oxidizable fractions, while residual Pb mainly occurred naturally. The average percentage of coal consumption contribution was 61.1% for the Pb contamination in sediments in the lower reaches in the TGR region.

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Citations

Aug 1, 2016·Environmental Science and Pollution Research International·Lanfang HanShiyan Wang
Oct 26, 2016·Archives of Environmental Contamination and Toxicology·Wenfeng WangJun Wang
Mar 8, 2016·Environmental Pollution·Efstratios KelepertzisHana Šillerová
Feb 14, 2020·International Journal of Environmental Research and Public Health·Dongyu Xu, Bo Gao
Feb 3, 2021·The Science of the Total Environment·Efstratios KelepertzisAriadne Argyraki
Sep 12, 2020·Ecotoxicology and Environmental Safety·Bihong HeQiaohui Fan

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