Table 1.
Organic chelators and reductants.
| Amendment | Concentration | mNa | Effectiveness |
|---|---|---|---|
| Ascorbate | 10-6 M | < 0.1 | NR |
| 10-4 M | < 0.1 | NR | |
| 10-2 M | < 0.1 | NR | |
| Oxalate | 10-6 M | 0.9(0) | Yes |
| 10-4 M | 1.1 | Yes | |
| 10-2 M | 2.(0) | Yes | |
| Ascorbate/oxalate | 10-6 M | 0.6(4) | LS |
| 10-4 M | < 0.1 | NR | |
| 10-2 M | < 0.1 | NR | |
| Cysteine | 10-6 M | 2.(6) | Yes |
| 10-4 M | 0.3(7) | LS | |
| 10-2 M | < 0.1 | NR | |
| Glycine | 10-6 M | 1.(8) | Yes |
| 10-4 M | 0.8(8) | LS | |
| 10-2 M | 1.3 | Yes | |
| Hydroxylamine | 10-6 M | 0.4(5) | LS |
| 10-4 M | 0.4(2) | LS | |
| 10-2 M | < 0.1 | NR | |
| Hydrazine | 10-6 M | 0.7(5) | LS |
| 10-4 M | 0.2(5) | LS | |
| 10-2 M | < 0.1 | NR |
Notes: a – ± 6.4 %; NR – not recommended; LS – lowered sensitivity