Table 4 Chemical characteristics of different NaFeEDTA sources
Product No. | Total Fe1, % | EDTA1, % | Molar ratio, mole:mole1,3 | Qf value2,4 | Moisture content, % | Lead1, mg/kg | Arsenic1, mg/kg | Fe dissolution rate1, % | Solubility1, % | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
Deionized H2O | HCl-KCl buffer (pH 2.0) | KH2PO4-K2HPO4 buffer (pH 5.0) | |||||||||
Feed grade NaFeEDTA 1 | 13.15 | 70.16 | 1.02:1 | – | 7.86 | 0.07 | 0.013 | 68.26 | 96.61 | 91.54 | 91.26 |
Feed grade NaFeEDTA 2 | 13.14 | 69.27 | 1.01:1 | 2.07 × 108 | 7.73 | 0.1 | 0.065 | 81.13 | 97.50 | 92.04 | 92.23 |
Feed grade NaFeEDTA 3 | 2.58 | – | – | – | – | – | – | – | – | – | – |
Feed grade NaFeEDTA 4 | 6.29 | – | – | – | – | – | – | – | – | – | – |
Food grade NaFeEDTA 1 | 13.33 | 69.43 | 1:1 | – | 8.56 | 0.08 | 0.076 | 70.71 | 94.32 | 90.75 | 89.95 |
Food grade NaFeEDTA 2 | 6.70 | – | – | – | – | – | – | – | – | – | – |
Food grade NaFeEDTA 3 | 6.27 | – | – | – | – | – | – | – | – | – | – |
Food grade NaFeEDTA 4 | 13.14 | 68.50 | 1:1 | 3.31 × 108 | 7.82 | 0.12 | 0.043 | 83.05 | 98.11 | 92.2 | 91.3 |
Food grade NaFeEDTA 5 | 12.93 | 68.60 | 1.01:1 | – | 8.52 | 0.01 | 0.11 | 79.88 | 99.05 | 94.44 | 93.41 |
Food grade NaFeEDTA 6 | 6.56 | – | – | – | – | – | – | – | – | – | – |
Food grade NaFeEDTA 7 | 6.64 | – | – | – | – | – | – | – | – | – | – |
Food grade NaFeEDTA 8 | 12.18 | – | – | – | – | – | – | – | – | – | – |