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Table 7 Correlation (r values) of heavy metal concentrations in wastewater and mosquito larvae samples from Sinai site

From: Urban mosquitoes and filamentous green algae: their biomonitoring role in heavy metal pollution in open drainage channels in Nairobi industrial area, Kenya

  Hg Pb Cr Cd Tl Ni
Wastewater       
 Hg a      
 Pb 1     
 Cr  − 0.820 1    
 Cd 0.998*  − 0.784 1   
 Tl 0.453  − 0.881 0.397 1  
 Ni 0.998*  − 0.858 0.992 0.513 1
Mosquito larvae       
 Hg 1      
 Pb 0.009 1     
 Cr  − 0.225 0.972 1    
 Cd  − 0.022  − 1.000**  − 0.969 1   
 Tl  − 0.022  − 1.000**  − 0.969 1.000** 1  
 Ni  − 0.418  − 0.912  − 0.792 0.918 0.918 1
  1. *Correlation significance at the 0.05 level (2 tailed)
  2. **Correlation significance at the 0.01 level (2-tailed)
  3. aCorrelation could not be computed because one of the variables was constant (level of Hg was < 0.1 ppb throughout)