Ferrous（Ⅱ） sulfate monohydrate (Ⅰ); Ferrous（Ⅱ） sulfate heptahydrate (Ⅱ)
Other name：Low iron sulfate, copperas, iron vitriol, xerox, iron fertilizer
CAS No.: 17375-41-6 (Ⅰ); 7782-63-0 (Ⅱ)
EINECS No.: 231-753-5
HS No.: 2833291000
Molecular Formula: FeSO4·H2O (Ⅰ); FeSO4·7H2O (Ⅱ)
Molecular weight：169.92 (Ⅰ); 278.05 (Ⅱ)
1. Appearance: Gray powder (Ⅰ); Turquoise crystal or granule (Ⅱ)
2. Specifications:
2.1 Ferrous（Ⅱ） sulfate heptahydrate
2.1.1、Ferrous（Ⅱ） sulfate heptahydrate for Water treatment agent
Quality standards：GB10531–2006
| Item Index | Drinking water use | Other water use |
| Ferrous（Ⅱ） sulfate as FeSO4.7H2O，wt%≥ | 90.0 | 90.0 |
| Titanium dioxide(TiO2), wt%≤ | 0.75 | 1.0 |
| Insoluble Matters, wt%≤ | 0.5 | 0.5 |
| Acidity (as H2SO4) ,wt%≤ | 1.0 | - |
| Arsenic（As）, wt%≤ | 0.0001 | - |
| Lead（Pb）,wt%≤ | 0.0005 | - |
| Item Index | Regular grade | Refined grade | Drying grade |
| Ferrous（Ⅱ） sulfate as FeSO4.7H2O，wt%≥ | 80.0 | 90.0 | 98.0 |
| Iron（Fe）, wt%≥ | 16.0 | 18.0 | 19.7 |
| Titanium dioxide(TiO2), wt%≤ | 0.5 | 0.3 | 0.5 |
| Insoluble Matters, wt%≤ | 0.2 | 0.2 | 0.2 |
| Arsenic（As）, wt%≤ | 0.0003 | 0.0003 | 0.0005 |
| Heavy metal (as Pb), wt%≤ | 0.0020 | 0.0020 | 0.0020 |
Quality standards：HG2935-2006
| Item Index | powder | granular |
| Ferrous（Ⅱ） sulfate as FeSO4•H2O，wt%≥ | 91.0 | 91.0 |
| Iron（Fe）, wt%≥ | 30.0 | 30.0 |
| Arsenic（As）, wt%≤ | 0.0010 | 0.0010 |
| Heavy metalasPb, wt%≤ | 0.002 | 0.002 |
Quality standards：HG2935-2006
| Item Index | Ⅰ | Ⅱ |
| Ferrous（Ⅱ） sulfate as FeSO4.H2O , wt% ≥ | 91.4 | - |
| Ferrous（Ⅱ） sulfate as FeSO4.7H2O, wt%≥ | - | 98.0 |
| Iron（Fe）, wt% ≥ ≥ | 30.0 | 19.7 |
| Arsenic（As）, wt%≤ | 0.0002 | 0.0002 |
| Heavy metal(as Pb), wt%≤ | 0.0020 | 0.0020 |
| Fineness（by180um sieve）, wt%≥ | 95 | - |
4. Uses: For making iron salts, iron oxide pigments, mordant, water purifier, preservative, disinfectant, etc, on medicine for anemia drugs
5. Storage: Stored in cool and ventilated, avoid light place.
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