TABLE 2.
A comparison of salt standards when used in iodization or the production of DFS1
| Input salt for the production of DFS | Final product | ||||||
|---|---|---|---|---|---|---|---|
| IS 16,232:2014 Indian standard for DFS (19) | East African standard 35:2011 for iodized salt (20) | IS 16,232:2014 Indian standard for DFS (19) | |||||
| Characteristics | FS | EFF | Coarse salt | Crushed salt | Table salt | Fortified with EFF | Fortified with FS |
| Chloride content as (NaCl), % on dry matter basis, min | ≥99 | ≥98 | ≥96.0 | ≥96.0 | ≥97.0 | ≥97 | |
| Moisture content, drying at 105°C, %, m/m, max | ≤1.5 | ≤1.5 | ≤4 | ≤4 | ≤3 | ≤1.5 | |
| Matter insoluble in water, %, on dry matter basis, max | ≤1.0 | ≤1.0 | ≤1 | ≤1 | ≤0.2 | ≤1.0 | |
| Magnesium (Mg) water-soluble, % on dry matter basis, max | ≤0.1 | ≤0.1 | ≤0.5 | ≤0.5 | ≤0.1 | ≤0.1 | |
| Sulfate (as SO4), % on dry matter basis, max | ≤1.1 | ≤1.1 | ≤0.5 | ≤0.5 | ≤0.50 | ≤1.1 | |
| Acid-insoluble matter % m/m, max | ≤0.3 | ≤0.3 | — | — | ≤0.2 | — | |
| pH of solution, 20 g in 100 mL distilled water, using standard laboratory pH meter | 3.5–5.5 | 3.5–7.5 | 7.0–8.0 | 7.0–8.0 | 7.0–8.0 | 3.5–7.5 | 3.5–5.5 |
1Reproduced from reference 9 with permission. DFS, double-fortified salt; EFF, encapsulated ferrous fumarate (used in DFS Type 1b and 1c); FS, ferrous sulfate; max, maximum; min, minimum; m/m, mass fraction.