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Characteristics of heavy metals and Pb isotopic composition in sediments collected from the tributaries in three Gorges Reservoir, China.

Gao B, Zhou H, Huang Y, Wang Y, Gao J, Liu X - ScientificWorldJournal (2014)

Bottom Line: Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources.The results showed that the average concentrations of heavy metals in sediment of TGR tributaries were higher than the local background values of soils and sediments in China.All Pb isotopic ratios in sediments were similar to those from coal combustion, lead ores (the mining activities and smelting process), and cement material, indicating that these anthropogenic inputs may be the main sources for Pb pollution in sediments of TGR tributaries.

View Article: PubMed Central - PubMed

Affiliation: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China ; State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.

ABSTRACT
The concentrations, distribution, accumulation, and potential ecological risk of heavy metals (Cr, Cu, Zn, Ni, As, Pb, Cd, and Hg) in sediments from the Three Gorges Reservoir (TGR) tributaries were determined and studied. Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources. The results showed that the average concentrations of heavy metals in sediment of TGR tributaries were higher than the local background values of soils and sediments in China. The assessment by Geoaccumulation Index indicated that Cu, Ni, and Hg were at the "slightly polluted" level and Cd was ranked as the "moderately polluted" level in tributary sediments of TGR. The assessment by Potential Ecological Risk Index showed that Hg and Cd were the predominant elements in tributary sediments in TGR. The Pb isotopic ratios in sediments varied from 1.171 to 1.202 for (206)Pb/(207)Pb and from 2.459 to 2.482 for (208)Pb/(207)Pb in TGR. All Pb isotopic ratios in sediments were similar to those from coal combustion, lead ores (the mining activities and smelting process), and cement material, indicating that these anthropogenic inputs may be the main sources for Pb pollution in sediments of TGR tributaries.

Show MeSH
The distribution of Pb isotopic compositions in sediments from TGR and other environmental sources.
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Related In: Results  -  Collection


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fig3: The distribution of Pb isotopic compositions in sediments from TGR and other environmental sources.

Mentions: In order to identify potential Pb sources of sediment, the Pb isotopic compositions of sediment samples were analyzed. The results of Pb isotope ratios of sediment samples and other environmental sources [8, 19–21] were shown in Figure 3. Lead isotopic ratios in sediments from TGR tributaries ranged from 1.171 to 1.202 for 206Pb/207Pb and 2.459 to 2.482 for 208Pb/207Pb, which varied with other different environmental media. The average values of Pb isotope ratios (206Pb/207Pb and 208Pb/207Pb) were 1.183 and 2.471. In fact, geochemical background Pb generally has relatively high 206Pb/207Pb (~1.200), while low 206Pb/207Pb ratios (<1.190) may indicate potential anthropogenic inputs. Thus, it can be seen that ratios of 206Pb/207Pb in most sediments from TGR were lower than 1.200, suggesting the influence of anthropogenic inputs on TGR. In order to assess Pb contamination and identify potential Pb sources of sediments, the correlation 206Pb/207Pb and 208Pb/207Pb ratios in sediments were also analyzed. The results showed that the relationship was not obviously correlated (R2 = 0.2863), indicating that Pb sources of sediments were relatively complicated and cannot be simply attributed to binary mixing process of two sources [22].


Characteristics of heavy metals and Pb isotopic composition in sediments collected from the tributaries in three Gorges Reservoir, China.

Gao B, Zhou H, Huang Y, Wang Y, Gao J, Liu X - ScientificWorldJournal (2014)

The distribution of Pb isotopic compositions in sediments from TGR and other environmental sources.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927837&req=5

fig3: The distribution of Pb isotopic compositions in sediments from TGR and other environmental sources.
Mentions: In order to identify potential Pb sources of sediment, the Pb isotopic compositions of sediment samples were analyzed. The results of Pb isotope ratios of sediment samples and other environmental sources [8, 19–21] were shown in Figure 3. Lead isotopic ratios in sediments from TGR tributaries ranged from 1.171 to 1.202 for 206Pb/207Pb and 2.459 to 2.482 for 208Pb/207Pb, which varied with other different environmental media. The average values of Pb isotope ratios (206Pb/207Pb and 208Pb/207Pb) were 1.183 and 2.471. In fact, geochemical background Pb generally has relatively high 206Pb/207Pb (~1.200), while low 206Pb/207Pb ratios (<1.190) may indicate potential anthropogenic inputs. Thus, it can be seen that ratios of 206Pb/207Pb in most sediments from TGR were lower than 1.200, suggesting the influence of anthropogenic inputs on TGR. In order to assess Pb contamination and identify potential Pb sources of sediments, the correlation 206Pb/207Pb and 208Pb/207Pb ratios in sediments were also analyzed. The results showed that the relationship was not obviously correlated (R2 = 0.2863), indicating that Pb sources of sediments were relatively complicated and cannot be simply attributed to binary mixing process of two sources [22].

Bottom Line: Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources.The results showed that the average concentrations of heavy metals in sediment of TGR tributaries were higher than the local background values of soils and sediments in China.All Pb isotopic ratios in sediments were similar to those from coal combustion, lead ores (the mining activities and smelting process), and cement material, indicating that these anthropogenic inputs may be the main sources for Pb pollution in sediments of TGR tributaries.

View Article: PubMed Central - PubMed

Affiliation: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China ; State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.

ABSTRACT
The concentrations, distribution, accumulation, and potential ecological risk of heavy metals (Cr, Cu, Zn, Ni, As, Pb, Cd, and Hg) in sediments from the Three Gorges Reservoir (TGR) tributaries were determined and studied. Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources. The results showed that the average concentrations of heavy metals in sediment of TGR tributaries were higher than the local background values of soils and sediments in China. The assessment by Geoaccumulation Index indicated that Cu, Ni, and Hg were at the "slightly polluted" level and Cd was ranked as the "moderately polluted" level in tributary sediments of TGR. The assessment by Potential Ecological Risk Index showed that Hg and Cd were the predominant elements in tributary sediments in TGR. The Pb isotopic ratios in sediments varied from 1.171 to 1.202 for (206)Pb/(207)Pb and from 2.459 to 2.482 for (208)Pb/(207)Pb in TGR. All Pb isotopic ratios in sediments were similar to those from coal combustion, lead ores (the mining activities and smelting process), and cement material, indicating that these anthropogenic inputs may be the main sources for Pb pollution in sediments of TGR tributaries.

Show MeSH