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Table 4 Correlation matrix among the different trace metals in sediment from Akaki River catchment and Aba Samuel reservoir in dry and rainy seasons

From: Distribution and ecological risk assessment of trace metals in surface sediments from Akaki River catchment and Aba Samuel reservoir, Central Ethiopia

  Cd Cr Cu Fe Pb Mn Ni Zn
Dry season
 Cd 1        
 Cr − 0.75* 1       
 Cu 0.22 0.04 1      
 Fe − 0.21 0.39 0.04 1     
 Pb − 0.72* 0.85* 0.11 0.01 1    
 Mn − 0.72* 0.81* − 0.12 0.73* 0.60* 1   
 Ni − 0.71* 0.97* 0.13 0.43 0.85* 0.83* 1  
 Zn 0.38 0.15 0.59 0.06 0.15 − 0.15 0.17 1
Rainy season
 Cd 1        
 Cr 0.28 1       
 Cu − 0.09* − 0.08 1      
 Fe 0.75* 0.67* 0.02 1     
 Pb − 0.57 − 0.19 0.03 − 0.78* 1    
 Mn 0.66* 0.66* 0.02 0.99* − 0.82* 1   
 Ni 0.52 0.81* 0.12 0.61* − 0.06 0.55 1  
 Zn − 0.15 0.26 0.46 0.17 − 0.05 0.17 0.28 1
  1. *Correlation is significant at p < 0.05 level (two-tailed)