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Table 3 Correlation matrix showing the relationship between the trace metal and surface sediment properties (number: 5, threshold value of relation coefficient at a 95% confidence level: 0.878)

From: Heavy metal accumulation during the last 30 years in the Karnaphuli River estuary, Chittagong, Bangladesh

  Mz TOC Al Cr Cu Ni Pb Zn
Mz 1.000        
TOC 0.772 1.000       
Al −0.887 −0.443 1.000      
Cr −0.924 −0.568 0.914 1.000     
Cu −0.974 −0.854 0.782 0.819 1.000    
Ni −0.950 −0.536 0.963 0.943 0.877 1.000   
Pb 0.008 −0.272 −0.134 −0.362 0.192 −0.100 1.000  
Zn −0.872 −0.650 0.784 0.962 0.778 0.830 −0.451 1.000