Molecular formula : MgSO4 · nH2O (n=0,1,2,3,4,5,6,7)
Molecular weight : 120.37+18n (n= 0,1,2,3,4,5,6,7)
CAS No: 10034-99-8 (MgSO4·7H2O) 7487-88-9 (MgSO4 ) 15320-30-6 (Dried MgSO4)
14168-73-1 (MgSO4·H2O)
Magnesium sulphate fulfill below specifications are available
| Item | HG/T 5737-2020(China Cosmetic MgSO4 Standard) | CP2020 (China pharmacopoeia) | USP39 (United States Pharmacopeia) | BP2020 Heptahydrate （British Pharmacopoeia）） | BP2020 Dried （British Pharmacopoeia） | EP9.0 （European Pharmacopoeia） | |||
| Anhydrous (MgSO4) | Monohydrae (MgSO4.H2O) | Heptahydrate (MgSO4.7H2O) | Dried (MgSO4.nH2O) | ||||||
| Appearance | White granule or powder | White granule or powder | White crystalline, odourless | White granule or powder | White crystalline, odourless | ——— | A white,crystalline powder or brilliant, colourless crystals | A white powder | A white,crystalline powder or brilliant, colourless crystals |
| Main content | MgSO4 (on dry basis)≧ 99% | MgSO4≥99.5% | 99.0％-100.5％ | 99.0％-100.5％ | 62％-70％ | 99.0％-100.5％ | |||
| Chlorine（Cl） | ——— | ≤100ppm | ≤140ppm | ≤300ppm | ≤400ppm | ≤300ppm | |||
| Iron（Fe） | ——— | ≤15ppm | ≤20ppm | ≤20ppm | ≤30ppm | ≤20ppm | |||
| Arsenic（As） | ≤2ppm | ≤2ppm | ——— | ≤2ppm | ≤3ppm | ≤2ppm | |||
| Heavy metals （as Pb） | ——— | ≤10ppm | ≤10ppm | ≤10ppm | ≤15ppm | ≤10ppm | |||
| Lead（Pb) | ≤5ppm | ——— | ——— | ——— | ——— | ——— | |||
| Selenium（Se） | ——— | ——— | ——— | ——— | ——— | ≤30ppm | ——— | ——— | ——— |
| Mercury（Hg） | ≤1ppm | ——— | ——— | ——— | ——— | ——— | |||
| Cadmium（Cd） | ≤5ppm | ——— | ——— | ——— | ——— | ——— | |||
| Loss on drying | ≦ 3% | 13.0~16.0 | 40.0~52.0 | 22.0~33.0 | 48-52% | 48-52% | 48-52% | 48-52% | 48-52% |
| Solubility/Clarify | ——— | Take this product 2.5g add water 20ml, and shake to dissolve, the solution should be clarified | ——— | Dissolve 5.0g in50ml water is clear and colourless | 7.5g dissolved in 20ml of water,producing a solution which may be slightly turbid at first but which become clear in a few minutes. | dissolove 5.0g in 50ml water is clear and colourless | |||
| PH value | 5.0~9.5 | Take this product 5.0g, add 50ml of water dissolved , add bromothymol blue indicator solution 3 drops ; show yellow , add sodium hydroxide (0.02mol / L) 0.10ml, strain ofblue-green ; such as significant blue- green orgreen ; add hydrochloric acid titrant (0.02 mol / L, ) 0.10ml strain of yellow | Between 5.0 and 9.2,in a solution (1 in 20) | To 10ml 10% w/v solution add 0.05 ml o f phenol red solution. Not more than 0.2ml of 0.01M hydrochloric acid or 0 . 01M sodium hydroxide is required to change the colour of the indicator. | To 10ml 7.5% w/v solution add 0.05 ml of phenol red solution.Not more than 0.2ml of 0.01M hydrochloric acid or 0.01M sodium hydroxide is required to change the colour of the indicator. | To 10ml 10% w/v solution add 0.05 ml of phenol red solution.Not more than 0.2ml of 0.01M hydrochloric acid or 0.01M sodium hydroxide is required to change the colour of the indicator. | |||
| TOC (Total Organic Carbon) | ≤30ppm | ——— | ——— | ——— | ——— | ——— | |||
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