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. 2023 Sep 19;9(9):e20299. doi: 10.1016/j.heliyon.2023.e20299

Table 12.

Pearson's correlation matrix between heavy metals in sludge and wastewater of HIE.

Heavy metals in sludge Heavy metals in wastewater
Cd Cr Pb Zn
Cd Pearson Correlation 0.447 0.489 0.745 0.521
Sig. (2-tailed) 0.45 0.404 0.148 0.368
N 5 5 5 5
Cr Pearson Correlation 0.158 0.348 .879* .895*
Sig. (2-tailed) 0.8 0.566 0.05 0.04
N 5 5 5 5
Pb Pearson Correlation 0 −0.268 −0.118 −0.272
Sig. (2-tailed) 1 0.663 0.85 0.658
N 5 5 5 5
Zn Pearson Correlation 0.259 0.006 0.007 −0.276
Sig. (2-tailed) 0.674 0.992 0.992 0.653
N 5 5 5 5

*. Correlation is significant at the 0.05 level (2-tailed).