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. 2023 Aug 26;9(9):e19550. doi: 10.1016/j.heliyon.2023.e19550

Table 4.

Correlations between physicochemical parameters and Potentially toxic elements of sludge.

As Cd Cr Cu Ni Pb Zn Fe pH Conductivity Salinity
As Pearson Correlation 1
Cd Pearson Correlation 0.596 1
Cr Pearson Correlation −0.141 0.398 1
Cu Pearson Correlation 0.724a 0.375 0.223 1
Ni Pearson Correlation .515 0.240 0.349 0.645 1
Pb Pearson Correlation 0.440 0.107 −0.120 0.593 0.250 1
Zn Pearson Correlation 0.502 0.128 0.024 0.457 0.215 0.762a 1
Fe Pearson Correlation −0.407 −0.268 −0.450 −0.541 −0.299 −0.559 −0.884** 1
pH Pearson Correlation 0.721a 0.080 −0.407 0.782a 0.286 0.723a 0.518 −0.322 1
Conductivity Pearson Correlation −0.368 −0.014 −0.266 −0.740a −0.796a −0.703a −0.501 0.500 −0.523 1
Salinity Pearson Correlation −0.381 −0.022 −0.252 −0.733a −0.811a −0.697a −0.493 0.483 −0.521 0.999** 1
Sample(N) 7 7 7 7 7 7 7 7 7 7 7
a

P > 0.05 and **P > 0.0.