质量标准: | 磷酸二氢铵,7722-76-1,Ammonium phosphate monobasic HG/T 3-1064-84 项目Item 分析纯 化学纯 (AR) (CP) 含量[NH4H2PO4]Assay,% ≥99.0 98.5 水溶液反应Solution reaction 合格 合格 澄清度试验Clarity 合格 合格 水不溶物Insoluble matter in water,% ≤0.005 0.01 氯化物(Cl)Chloride,% ≤0.0005 0.001 硫化合物(以SO4计)Sulfur compounds ≤0.005 0.01 硝酸盐(NO3)Nitrate,% ≤0.001 0.002 铁(Fe)Iron,% ≤0.001 0.003 砷(As),Arsenic,% ≤0.0005 0.002 重金属(以Pb计)Heavy metals,% ≤0.0005 0.001 碱金属(以磷酸盐计)Alkali metals,% ≤0.2 0.3 ACS级 项目名称Item ACS Grade 含量NH4H2PO4Assay ≥98.0% pH(5%溶液,25.0℃)pH 3.8-4.4 水不溶物Insoluble matter ≤0.005% 氯化物(Cl)Chloride(Cl) ≤5ppm 硝酸盐(NO3)Nitrate ≤0.001% 硫酸盐(SO4)Sulfate ≤0.01% 重金属(以Pb计)Heavy metals(as Pb) ≤5ppm 铁(Fe)Iron(Fe) ≤0.001% 钙(Ca)Calcium(Ca) ≤0.001% 镁(Mg)Magnesium(Mg) ≤5ppm 钾(K)Potassium(K) ≤0.005% 钠(Na)Sodium(Na) ≤0.005% |