|
Extraction of Inorganic P from Soils* |
|
| Extractant |
P forms extracted |
|
|
|
| NaOH/NaCl |
Al- and Fe-bound |
| Na citrate-bicarbonate (CB) |
Labile pedogenic Ca-rich |
| Na citrate (C) |
Pedogenic Ca-phosphates |
| Na citrate-ascorbate (CA) |
Occluded in poorly crystalline Fe-oxides |
| Na citrate-bicarbonate-dithionite (CBD) |
Occluded in crystalline Fe-oxides |
| Na acetate |
Ca phosphates (excl. lithogenic apatite) |
| HCl |
Lithogenic apatite |
|
*adapted from ref. [23] | |
von Wandruszka Geochemical Transactions 2006 7:6 doi:10.1186/1467-4866-7-6 |
|