Table 4 (ESM only) Paired t-test for the differences in the concentrations, geoaccumulation
index (Igeo) values, and contamination factors of heavy metals between surface and subsurface lacustrine sediments from the Yangzonghai Lake. The p-value was calculated using
metal concentrations in the surface sediments as the first variable and that in the sub-surface
sediments as the second variable.
concentrations
Igeo
p-value (2elements
t
tailed)
Contamination factor
p-value (2t
tailed)
p-value (2t
tailed)
As
2.670
0.010**
2.546
0.014*
2.670
0.010**
Hg
2.117
0.039*
3.915
0.000**
2.190
0.033*
Cd
5.040
0.000**
6.631
0.000**
5.017
0.000**
Pb
1.462
0.149
1.962
0.055
1.462
0.149
Zn
2.996
0.004**
3.208
0.002**
2.996
0.004**
Ni
1.619
0.111
2.100
0.040*
1.619
0.111
Co
2.386
0.020*
2.866
0.006**
2.386
0.020*
Fe
1.060
0.294
-
-
-
-
* Significant at 0.05 probability level.
** Significant at 0.01 probability level.