质量标准: | GB/T671-77 项目Item 优等纯 分析纯 化学纯 (GR) (AR) (CP) 含量(MgSO4•7H2O)Assay,% ≥99.5 99.0 99.0 水溶液反应Water solution reaction 合格 合格 合格 澄清度试验Clarity 合格 合格 合格 水不溶物Insoluble matter,% ≤0.002 0.005 0.01 氯化物(Cl)Chloride,% ≤0.0002 0.0005 0.001 钠(Na)Sodium,% ≤0.005 0.005 0.05 钙(Ca)Calcium,% ≤0.01 0.02 0.05 锰(Mn)Manganese,% ≤0.0005 0.001 0.005 铁(Fe)Iron,% ≤0.0002 0.0005 0.001 锌(Zn)Zinc,% ≤0.0005 0.001 0.002 砷(As)Arsenic,% ≤0.0005 0.0001 0.0002 重金属(以Pb计)Heavy metals,% ≤0.0002 0.0005 0.001 七水硫酸镁,10034-99-8,Magnesium sulfate ACS级 项目名称Item ACS Grade 含量[MgSO4•7H2O]Assay 98.0-102.0% pH(5%溶液,25.0℃)pH 5.0-8.2 水不溶物Insoluble matter ≤0.005% 氯化物(Cl)Chloride(Cl) ≤5ppm 硝酸盐(NO3)Nitrate ≤0.002% 铵(NH4)Ammonium ≤0.002% 钙(Ca)Calcium(Ca) ≤0.02% 锰(Mn)Manganese(Mn) ≤5ppm 钾(K)Potassium(K) ≤0.005% 钠(Na)Sodium(Na) ≤0.005% 锶(Sr)Strontium(Sr) ≤0.005% 重金属(以Pb计)Heavy metals(as Pb) ≤5ppm 铁(Fe)Iron(Fe) ≤5ppm USP, EP, BP 级 ASSAY (MgSO4; ANHYDROUS BASIS) 99.0 - 100.5% pH OF A 5% SOLUTION @ 25oC 5.0 - 9.2 LOSS ON IGNITION @ 105 C 48.0 - 52.0% CHLORIDE (Cl) -- 0.014 % IRON (Fe) -- 20 ?G/G HEAVY METALS -- 0.001 % SELENIUM (Se) -- 0.003 % ACIDITY OR ALKALINITY -- TO PASS TEST ARSENIC (As) -- 2 PPM |