| Author | Heavy Metal Concentration | Study Area | |||
| Cu | Fe | Mn | Zn | ||
| Current Study | 0.2372 - 0.7152 | 293.6 - 884.9 | 4.265 - 68.55 | 4.239 - 42.53 | University of Agriculture Makurdi |
| Yap et al. [27] | 87.50 - 442.0 | 3445 - 3852 | NA | 439.0 - 880.0 | Selangor School, Malaysia |
| Chattopadhyay et al., [28] | 147.0 | NA | NA | 657.0 | Sydney, Australia |
| Mgbamena and Onwukeme [10] | 12.75 - 34.75 | 2701 - 2798 | 87.50 - 124.5 | 160.0 - 161.0 | Aba, Nigeria |
| Ibrahim et al., [26] | 0.860 - 3.120 | 1111 - 2436 | 10.03 - 24.99 | NA | Amber Province, Iraq |
| Adekola and Dosumu [2] | 0.510 | 40.60 | NA | NA | University of Ilorin, Nigeria |