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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
Spatial distribution of heavy metals in sediments from TGR tributaries.
© Copyright Policy - open-access
Related In: Results  -  Collection


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fig2: Spatial distribution of heavy metals in sediments from TGR tributaries.

Mentions: From Figure 2 (Cd and Hg concentrations were 50 times the actual concentrations to better comparison with other metals), it can be seen that the mean concentrations of Cr, Cu, Ni, As, Pb, and Hg in midstream (including from S5 to S10) of TGR were generally higher than those in downstream (including from S1 to S4), and the lowest value of these metals was located in upstream (including from S11 to S13), as in Figure 1. But the order of the mean concentrations of Zn and Cd was downstream > midstream > upstream. This indicated that the contaminations of Zn and Cd were more seriously in upstream. The heavy metals in sediments from TGR tributaries showed a similar spatial distribution, except for Zn and Cd. Among tributaries of TGR, the highest value of Zn and Cd were observed at site S2 (XiangXi River). In addition, the highest concentrations of Cr, Cu, Ni, As, and Pb were found in S7 (the tributary of Modao River), and the highest concentration of Hg was observed at S10 (Ruxi River).


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)

Spatial distribution of heavy metals in sediments from TGR tributaries.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig2: Spatial distribution of heavy metals in sediments from TGR tributaries.
Mentions: From Figure 2 (Cd and Hg concentrations were 50 times the actual concentrations to better comparison with other metals), it can be seen that the mean concentrations of Cr, Cu, Ni, As, Pb, and Hg in midstream (including from S5 to S10) of TGR were generally higher than those in downstream (including from S1 to S4), and the lowest value of these metals was located in upstream (including from S11 to S13), as in Figure 1. But the order of the mean concentrations of Zn and Cd was downstream > midstream > upstream. This indicated that the contaminations of Zn and Cd were more seriously in upstream. The heavy metals in sediments from TGR tributaries showed a similar spatial distribution, except for Zn and Cd. Among tributaries of TGR, the highest value of Zn and Cd were observed at site S2 (XiangXi River). In addition, the highest concentrations of Cr, Cu, Ni, As, and Pb were found in S7 (the tributary of Modao River), and the highest concentration of Hg was observed at S10 (Ruxi River).

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