Months of the year | River-Ase | Warri River | River Ethiope | ||||||
Pb (PPM) | Zn (PPM) | Fe (PPM) | Pb (PPM) | Zn (PPM) | Fe (PPM) | Pb (PPM) | Zn (PPM) | Fe (PPM) | |
Jan. | <0.01 | 1.61 | 4.56* | 0.001 | 1.21 | 0.96* | 0.001 | 0.04 | 0.01 |
Feb. | <0.01 | 1.87 | 4.05* | 0.001 | 1.01 | 0.92* | 0.002 | 0.21 | 0.01 |
Mar. | <0.01 | 1.72 | 4.08* | 0.002 | 0.96 | 0.62* | 0.007 | 0.36 | 0.01 |
Apr. | <0.01 | 0.67 | 4.74* | <0.001 | 0.46 | 0.28 | 0.001 | 0.46 | 0.02 |
May | <0.01 | 0.66 | 4.43* | <0.001 | 0.16 | 0.24 | 0.02* | 0.51 | 0.05 |
June | <0.01 | 0.76 | 4.33* | <0.001 | 0.56 | 1.02* | 0.001 | 0.41 | 0.04 |
July | <0.01 | 0.77 | 4.09* | 0.002 | 0.42 | 2.01* | 0.027* | 0.41 | 0.00 |
Aug. | <0.01 | 0.67 | 3.65* | 0.001 | 0.24 | 1.04* | 0.001 | 0.36 | 0.07 |
Sep. | <0.01 | 0.84 | 2.57* | 0.002 | 0.16 | 0.94* | 0.01 | 0.01 | 0.01 |
Oct. | <0.01 | 0.96 | 2.36* | 0.001 | 1.31 | 0.76* | 0.01 | 0.01 | 0.03 |
Nov. | <0.01 | 0.92 | 2.27* | 0.002 | 1.42 | 0.82* | 0.02* | 0.01 | 0.01 |
Dec. | <0.01 | 0.92 | 2.09* | 0.001 | 1.26 | 0.72* | 0.02* | 0.02 | 0.02 |
RANGE | <0.01 | 1.21 | 2.65 | 0.002 | 1.26 | 1.77 | 0.009 | 0.50 | 0.06 |
X | <0.01 | 1.03 | 3.60 | 0.001 | 0.76 | 0.85 | 0.01 | 0.23 | 0.02 |
WHO | 0.01 | 3.00 | 0.30 | 0.01 | 3.00 | 0.30 | 0.01 | 3.00 | 0.30 |