| # | Reactive metal substance | Soil | Number of data points | Reference |
| 1 | Cu | Alligator | 7 | Selim and Amacher, 1997 | 2 | Cu | McLaren | 5 | Selim and Amacher, 1997 | 3 | Cu | Cecil | 5 | Selim and Amacher, 1997 | 4 | Zn | Alligator | 10 | Selim and Amacher, 1997 | 5 | Zn | Kula | 7 | Selim and Amacher, 1997 | 6 | Zn | Webster | 8 | Selim and Amacher, 1997 | 7 | Pb | Cecil | 6 | Selim and Amacher, 1997 | 8 | Pb | Spodosol | 5 | Selim and Amacher, 1997 | 9 | Pb | Lafitte | 7 | Selim and Amacher, 1997 | 10 | Pb | Alligator | 8 | Selim and Amacher, 1997 | 11 | Cr | Alligator | 15 | Buchter et al., 1989 | 12 | Cr | Windsor | 12 | Buchter et al., 1989 | 13 | Cr | Kula | 10 | Buchter et al., 1989 | 14 | Cd | Molokai | 13 | Buchter et al., 1989 | 15 | Cd | Kula | 10 | Buchter et al., 1989 | 16 | Cd | Windsor | 14 | Buchter et al., 1989 | 17 | Cd | Spodosol | 14 | Buchter et al., 1989 | 18 | Cd | Calciorthid | 7 | Buchter et al., 1989 | 19 | Ca | Hartsells | 6 | Bolster and Hornberger, 2007 | 20 | Ca | Pembroke | 6 | Bolster and Hornberger, 2007 | 21 | Ca | Loring | 6 | Bolster and Hornberger, 2007 |
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