Table 2.
Proportions of REE sorbed by carboxylic groups (CG), phenolic groups (PG), carboxy-phenolic groups (CPG) and total (TOT) for various experimental conditions obtained by modeling using PHREEQC-Model VI.
| IS |
%CG |
%PG |
%CPG |
%TOT |
%CG |
%PG |
%CPG |
%TOT |
%CG |
%PG |
%CPG |
%TOT |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.001 |
0.001 |
0.001 |
0.001 |
0.01 |
0.01 |
0.01 |
0.01 |
0.1 |
0.1 |
0.1 |
0.1 |
|
| pH | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| La | 33 | 0 | 1 | 34 | 30 | 0 | 1 | 31 | 21 | 0 | 1 | 22 |
| Ce | 39 | 0 | 2 | 40 | 35 | 0 | 1 | 37 | 26 | 0 | 1 | 27 |
| Pr | 41 | 0 | 3 | 43 | 37 | 0 | 2 | 40 | 28 | 0 | 2 | 30 |
| Nd | 42 | 0 | 3 | 45 | 38 | 0 | 3 | 41 | 29 | 0 | 2 | 31 |
| Sm | 44 | 0 | 4 | 48 | 40 | 0 | 4 | 44 | 31 | 0 | 4 | 35 |
| Eu | 40 | 0 | 5 | 45 | 37 | 0 | 5 | 42 | 28 | 0 | 4 | 32 |
| Gd | 37 | 0 | 5 | 42 | 33 | 0 | 5 | 38 | 25 | 0 | 4 | 29 |
| Tb | 33 | 0 | 6 | 39 | 30 | 0 | 5 | 36 | 23 | 0 | 5 | 27 |
| Dy | 30 | 0 | 7 | 37 | 27 | 0 | 6 | 34 | 20 | 0 | 5 | 25 |
| Ho | 27 | 0 | 7 | 35 | 25 | 0 | 6 | 31 | 18 | 0 | 5 | 23 |
| Er | 28 | 1 | 7 | 36 | 26 | 0 | 7 | 33 | 19 | 0 | 6 | 25 |
| Tm | 25 | 1 | 10 | 36 | 23 | 1 | 9 | 32 | 17 | 1 | 7 | 25 |
| Yb | 22 | 2 | 11 | 36 | 20 | 2 | 11 | 32 | 15 | 1 | 9 | 25 |
| Lu | 20 | 2 | 13 | 36 | 18 | 2 | 12 | 32 | 13 | 1 | 10 | 25 |
| IS |
%CG |
%PG |
%CPG |
%TOT |
%CG |
%PG |
%CPG |
%TOT |
%CG |
%PG |
%CPG |
%TOT |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.001 |
0.001 |
0.001 |
0.001 |
0.01 |
0.01 |
0.01 |
0.01 |
0.1 |
0.1 |
0.1 |
0.1 |
|
| pH | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| La | 83 | 0 | 9 | 92 | 74 | 0 | 8 | 82 | 57 | 0 | 6 | 63 |
| Ce | 82 | 0 | 12 | 94 | 75 | 0 | 11 | 86 | 61 | 0 | 8 | 70 |
| Pr | 79 | 0 | 16 | 95 | 73 | 0 | 15 | 88 | 61 | 0 | 11 | 73 |
| Nd | 77 | 0 | 18 | 95 | 71 | 0 | 17 | 88 | 61 | 0 | 13 | 74 |
| Sm | 72 | 0 | 23 | 96 | 68 | 0 | 22 | 90 | 59 | 0 | 18 | 77 |
| Eu | 68 | 0 | 28 | 96 | 63 | 0 | 26 | 89 | 55 | 0 | 21 | 76 |
| Gd | 65 | 1 | 29 | 95 | 61 | 1 | 27 | 88 | 52 | 0 | 22 | 74 |
| Tb | 61 | 1 | 33 | 95 | 56 | 1 | 30 | 87 | 48 | 1 | 24 | 72 |
| Dy | 58 | 1 | 36 | 94 | 53 | 1 | 33 | 87 | 44 | 1 | 26 | 71 |
| Ho | 54 | 2 | 38 | 94 | 49 | 2 | 35 | 86 | 40 | 1 | 27 | 69 |
| Er | 54 | 2 | 38 | 94 | 49 | 2 | 35 | 86 | 41 | 1 | 28 | 70 |
| Tm | 48 | 3 | 43 | 94 | 44 | 3 | 40 | 86 | 36 | 3 | 32 | 70 |
| Yb | 43 | 4 | 47 | 94 | 39 | 4 | 43 | 86 | 32 | 4 | 35 | 71 |
| Lu | 38 | 6 | 50 | 94 | 34 | 6 | 46 | 86 | 28 | 5 | 38 | 71 |
| IS |
%CG |
%PG |
%CPG |
%TOT |
%CG |
%PG |
%CPG |
%TOT |
%CG |
%PG |
%CPG |
%TOT |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.001 |
0.001 |
0.001 |
0.001 |
0.01 |
0.01 |
0.01 |
0.01 |
0.1 |
0.1 |
0.1 |
0.1 |
|
| pH | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| La | 85 | 0 | 14 | 100 | 80 | 1 | 18 | 99 | 71 | 1 | 19 | 91 |
| Ce | 81 | 1 | 18 | 100 | 76 | 1 | 22 | 100 | 68 | 1 | 24 | 93 |
| Pr | 76 | 1 | 23 | 100 | 70 | 2 | 28 | 100 | 62 | 2 | 30 | 95 |
| Nd | 73 | 1 | 25 | 100 | 66 | 3 | 31 | 100 | 59 | 3 | 33 | 95 |
| Sm | 66 | 2 | 31 | 100 | 59 | 4 | 37 | 100 | 52 | 5 | 39 | 96 |
| Eu | 60 | 3 | 36 | 100 | 52 | 6 | 42 | 100 | 46 | 7 | 44 | 96 |
| Gd | 57 | 4 | 38 | 100 | 49 | 7 | 44 | 100 | 43 | 8 | 46 | 96 |
| Tb | 53 | 5 | 42 | 100 | 44 | 9 | 47 | 100 | 38 | 10 | 48 | 96 |
| Dy | 48 | 7 | 45 | 100 | 39 | 11 | 49 | 100 | 34 | 12 | 50 | 96 |
| Ho | 44 | 8 | 47 | 100 | 36 | 13 | 51 | 100 | 30 | 14 | 52 | 96 |
| Er | 44 | 8 | 47 | 100 | 36 | 13 | 51 | 100 | 30 | 14 | 52 | 96 |
| Tm | 38 | 11 | 51 | 100 | 30 | 16 | 53 | 100 | 25 | 17 | 53 | 96 |
| Yb | 33 | 15 | 53 | 100 | 25 | 20 | 54 | 100 | 21 | 21 | 54 | 97 |
| Lu | 28 | 18 | 55 | 100 | 21 | 24 | 55 | 100 | 18 | 25 | 54 | 97 |