Heavy metals Clarke Value R1 R2 E1 E2 Wet season Dry season Wet season Dry season Wet season Dry season Wet season Dry season Al 81300 0.002 0.001 0.001 0.002 0.010 0.009 0.007 0.002 As 5 0.000 0.020 0.000 0.000 0.008 0.052 0.038 0.090 Ba 260 0.005 0.004 0.006 0.011 0.013 0.009 0.009 0.003 Co 23 0.000 0.000 0.000 0.000 0.0004 0.002 0.008 0.0001 Cr 200 0.004 0.003 0.004 0.005 0.010 0.024 0.029 0.012 Cu 70 0.000 0.000 0.010 0.0003 0.010 0.012 0.036 0.013 Fe 50000 0.006 0.005 0.007 0.008 0.010 0.017 0.015 0.008 Pb 16 0.006 0.000 0.013 0.009 0.056 0.170 0.140 0.040 Mn 1000 0.004 0.003 0.003 0.005 0.005 0.007 0.007 0.003 Mo 15 0.000 0.000 0.003 0.000 0.0003 0.005 0.012 0.0007 Ni 80 0.0006 0.0001 0.0006 0.001 0.003 0.006 0.017 0.004 Se *0.05 0.000 0.000 1.000 0.000 14.800 8.000 13.600 0.000 Sr 300 0.002 0.002 0.003 0.008 0.019 0.028 0.051 0.024 Ti 4400 0.002 0.002 0.002 0.003 0.012 0.011 0.011 0.013 V 150 0.004 0.004 0.005 0.006 0.011 0.013 0.023 0.016 Zn 132 0.005 0.005 0.009 0.007 0.034 0.056 0.060 0.010 Zr *165 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Clarke values after: *[37, 38]

Table 2: Contamination factors of heavy metals present in the Isipingo River and Estuarine sediments.