19 research outputs found

    Comparison of heavy metal concentrations in sediments.

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    <p>(HFT: sites at inlets of main tributaries in the Hongfeng Reservoir, namely sites 1–5; HFR: representative sites within Hongfeng Reservoir, namely sites 6–13; BHT: sites at inlets of main tributaries in the Baihua Reservoir (except site 14), namely sites 15–22; BHR: representative sites within the Baihua Reservoir, namely sites 23–26).</p

    Locations of sampling sites in the Hongfeng and Baihua Reservoirs on the Yunnan-Guizhou Plateau, Southwest China.

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    <p>Locations of sampling sites in the Hongfeng and Baihua Reservoirs on the Yunnan-Guizhou Plateau, Southwest China.</p

    Map of Hongfeng and Baihua Reservoirs on the Yunnan-Guizhou Plateau, Southwest China.

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    <p>Map of Hongfeng and Baihua Reservoirs on the Yunnan-Guizhou Plateau, Southwest China.</p

    Principal Component Analysis (PCA) for heavy metals in surface sediments from the Hongfeng and Baihua Reservoirs.

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    <p>Factor loadings smaller than 0.3 have been removed.</p><p>Extraction method: PCA, Rotation method: Varimax with Kaiser normalization.</p

    Ecological risk assessment criteria for the sediment quality guidelines (SQGs) and Hakanson index.

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    <p><i>C:</i> concentration of heavy metal in surface sediment.</p><p>TEC: threshold effect level; PEC: probable effect level <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0102101#pone.0102101-Macdonald1" target="_blank">[15]</a>.</p><p>m-PEC-Q: mean PEC quotient; <sup>a</sup>incidence of toxicity <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0102101#pone.0102101-Long1" target="_blank">[36]</a>.</p

    Correlations between heavy metals in surface sediments from the Hongfeng and Baihua Reservoirs.

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    <p>Hongfeng Reservoir in the upper right corner (blod); Baihua Reservoir in the lower left corner.</p><p>Levels of significance: *p<0.05; **p<0.01.</p

    Mean PEC quotient (a) and potential ecological risk indexes (b) of heavy metals in sediments.

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    <p>Mean PEC quotient (a) and potential ecological risk indexes (b) of heavy metals in sediments.</p

    Distribution of main point sources of pollution in the Hongfeng and Baihua Reservoir basins.

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    <p>Distribution of main point sources of pollution in the Hongfeng and Baihua Reservoir basins.</p

    Heavy metal concentrations in surface sediments from Hongfeng and Baihua Reservoirs.

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    <p>Heavy metal concentrations in surface sediments from Hongfeng and Baihua Reservoirs.</p
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