... ,% ≥98.098.0 ∼ 102.0Loss on dry ,% ≤0.50≤0.30Reduzate ,% ≤0.70≤0.50PH6.2 ∼ 7.86.2 ∼ 7.8Sulfate ,% ≤0.05≤0.05Chloride ,%≤0.07≤0.07Pb ,μ g ... /g≤2≤1Arsenic salt ,μ g/g≤2≤2Heavy metals ,μ g/g≤10≤10Appearance of solution (1.0g ... ,10ml water)colorless, almost clear Uses:1 , In the medicine field, it can ...