Table 7.
Inositol hexaphosphate (IHP) stereoisomer concentrations, determined by solution P-NMR or mass spectrometry
| Extractant | AR-control | AR-N | AR-PL | AR-PL-alum | SK | PEI | Till Ref | ||
|---|---|---|---|---|---|---|---|---|---|
| myo-IHP | Mehlich III | Soil | 14 (22) | 12 (15) | 11 (3) | 219 (33) | 5 (5) | 7 (3) | 2 (5) |
| NMR | NaOH-EDTA | Residue | 32 (13) | 40 (13) | 48 (8) | 336 (31) | 17 (8) | 32 (8) | 26 (8) |
| NaOH-EDTA | Soil | 39 (14) | 62 (19) | 29 (4) | 229 (19) | 34 (10) | 43 (6) | 30 (8) | |
| NaOH-EDTA | Difference | 7 (1) | 21 (6) | − 19 (− 4) | − 107 (− 11) | 18 (2) | 10 (3) | 3 (0) | |
| scyllo-IHP | Mehlich III | Soil | 4 (6) | 3 (4) | 3 (1) | 10 (2) | 1 (1) | 2 (1) | 1 (2) |
| NMR | NaOH-EDTA | Residue | 4 (1) | 7 (2) | 4 (1) | 15 (1) | 7 (3) | 11 (3) | 9 (3) |
| NaOH-EDTA | Soil | 7 (3) | 11 (3) | 10 (3) | 16 (1) | 7 (2) | 16 (2) | 10 (3) | |
| neo-IHP | Mehlich III | Soil | 0 (1) | 1 (1) | 3 (1) | 5 (1) | 1 (1) | 2 (1) | 0 (1) |
| NMR | NaOH-EDTA | Residue | 2 (1) | 2 (1) | 4 (1) | 0 (0) | 1 (1) | 3 (1) | 2 (1) |
| NaOH-EDTA | Soil | 2 (1) | 2 (1) | 5 (1) | 8 (1) | 2 (1) | 5 (1) | 3 (1) | |
| chiro-IHP | Mehlich III | Soil | 2 (3) | 3 (4) | 5 (1) | 20 (3) | 2 (2) | 3 (1) | 1 (3) |
| NMR | NaOH-EDTA | Residue | 11 (4) | 13 (4) | 24 (4) | 39 (4) | 7 (4) | 8 (2) | 7 (2) |
| NaOH-EDTA | Soil | 9 (3) | 11 (3) | 20 (3) | 33 (3) | 15 (4) | 21 (3) | 13 (4) | |
| Total IHP | Mehlich III | Soil | 20 (31) | 20 (24) | 21 (6) | 254 (38) | 9 (9) | 14 (6) | 3 (10) |
| NMR | NaOH-EDTA | Residue | 48 (19) | 63 (21) | 81 (13) | 390 (35) | 32 (16) | 54 (14) | 44 (13) |
| NaOH-EDTA | Soil | 57 (20) | 86 (26) | 62 (8) | 286 (24) | 59 (17) | 85 (11) | 54 (15) | |
| NaOH-EDTA | Difference | 8 (1) | 23 (6) | − 18 (− 5) | − 104 (− 11) | 27 (2) | 31 (− 3) | 11 (2) | |
| Total IHP | Mehlich III | Soil | 11 (17) | 4 (5) | 9 (3) | 46 (7) | 1 (< 1) | 6 (3) | 1 (1) |
| Mass spec. | NaOH-EDTA | Residue | 47 (19) | 51 (15) | 52 (8) | 354 (32) | 29 (15) | 58 (15) | 37 (11) |
| NaOH-EDTA | Soil | 60 (20) | 66 (20) | 59 (9) | 329 (29) | 38 (20) | 68 (17) | 39 (11) |
Values are concentration in mg kg−1 (percentage of extract P). Residue is the residual soil after Mehlich III extraction. Total inorganic P is the sum of orthophosphate, pyrophosphate and polyphosphate. Difference is the difference in between the NaOH-EDTA extracts of whole soils and the NaOH-EDTA extracts of the residue after Mehlich III extraction