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Magnesium sulfate heptahydrate(七水酸): Appearance White Crystalline (白色结晶) Main content(主含量)≥99% MgSO4(酸)≥48. % MgO(氧化)≥16. % Mg()≥ 9.7% PH(5W/V%Sol)---5-8 Iron(Fe铁)---- 0.0015% Chlorid(Cl氯)---- 0.01% Heavy metal (Pb重金属)--- 0.001 % Arsenic(As砷)----0.0002% Insoluble(水不溶物)----0.01% Size (mm颗粒)---- 0.1-1