Table III.
Zn structural parameters in reference compounds and plant samples
| Sample | First Shell (O)
|
Atom | Second Shell
|
Resa | |||||
|---|---|---|---|---|---|---|---|---|---|
| N | R | ς2 | N | R | ς2 | ||||
| Å | Å2 | Å | Å2 | ||||||
| Reference compounds | |||||||||
| Zn Phytate | 3.9 | 1.96 | 0.008 | P | 1.0 | 3.08 | 0.010 | 16 | |
| Zn malate | 4.2 | 2.01 | 0.010 | C | 1.9 | 2.80 | 0.012 | 14 | |
| Zn citrate | 4.3 | 2.03 | 0.010 | C | 3.5 | 2.76 | 0.012 | 12 | |
| Plant samples | |||||||||
| [Zn]solution | |||||||||
| Aerial parts | (μm) | ||||||||
| A.h.-C | 250 | 4.5 | 2.01 | 0.010 | C | 1.9 | 2.87 | 0.009 | 16 |
| 100 | 4.3 | 2.01 | 0.010 | C | 1.5 | 2.81 | 0.012 | 16 | |
| 10 | 3.7 | 1.99 | 0.009 | C | 2.0 | 2.86 | 0.010 | 24 | |
| A.h.-NC | 250 | 4.5 | 2.03 | 0.010 | C | 2.1 | 2.80 | 0.012 | 17 |
| 100 | 4.3 | 2.01 | 0.010 | C | 1.9 | 2.84 | 0.010 | 15 | |
| A.l. | 10 | 4.1 | 1.99 | 0.010 | P | 1.3 | 3.07 | 0.011 | 17 |
| A.h.-C (soil) | – | 4.6 | 2.01 | 0.010 | C | 0.6 | 2.80 | 0.012 | 17 |
| Roots | |||||||||
| A.h.-C | 250 | 4.1 | 1.96 | 0.007 | P | 1.3 | 3.09 | 0.008 | 15 |
| 100 | 4.3 | 1.95 | 0.007 | P | 1.5 | 3.09 | 0.009 | 15 | |
| 10 | 4.3 | 1.97 | 0.009 | 11 | |||||
| A.h.-NC | 250 | 4.2 | 1.96 | 0.007 | P | 1.1 | 3.10 | 0.007 | 15 |
| 100 | 4.0 | 1.96 | 0.008 | P | 1.7 | 3.16 | 0.009 | 8 | |
| A.l. | 10 | 4.0 | 1.98 | 0.009 | P | 1.2 | 3.06 | 0.011 | 14 |
| A.h.-C (soil) | – | 4.3 | 2.00 | 0.011 | C | 1.2 | 2.77 | 0.012 | 18 |
Structural parameters were obtained by simulating the first two coordination shells of Zn. R, Interatomic distance (Å); ς2, Debye-Waller disorder factor (Å2).
a
The quality of the fit is estimated by the residual Res = Σ k3χ (k)exp − k3χ (k)fit / Σ k3 χ (k)exp *100. Estimated errors on R and N are ± 0.01 Å and ± 10% for the first shell, and ± 0.03 Å and ± 20% for the second shell, respectively.