Fig 1.
Map of the sampling stations in the Chishui River Basin, China.
Table 1.
The coordinates of sampling sites of the Chishui River.
Table 2.
Congruent relationships between metal Igeo values and pollution levels [22].
Table 3.
Pollution grading standards based on the pollution load index (PLI) [23].
Table 4.
Indexes of the potential ecological risk and grades [24].
Fig 2.
Variation of measured heavy metals in the surface sediments of Chishui River Basin based on the direction of flow.
Table 5.
Concentrations (mg kg-1) of the five heavy metals in the sediments collected from the Chishui River compared to other rivers in China and the world.
Table 6.
Igeo values for five heavy metals in Chishui River sediments.
Fig 3.
Pollution load index for heavy metals in the sediments at different sites in the Chishui River Basin, China.
Fig 4.
Potential ecological risk indexes for heavy metals in sediments from the Chishui River Basin, China.
Table 7.
Risk factors ( values) for heavy metals in sediments from the Chishui River Basin, China.
Table 8.
Pearson correlation coefficient matrix for the heavy metals in the Chishui River surface sediments.