项目 分析纯 AR 含量 ≥99.0% PH(50g/L,25℃) 8.9-9.4 澄清度试验 合格 水不溶物 ≤0.02% 氯化物(Cl) ≤0.004% 硫酸盐(SO4) ≤0.03% 硝酸盐(NO3) ≤0.002% 钠(Na) ≤0.05% 镁(Mg) ≤0.002% 铁(Fe) ≤0.003% 砷(As) ≤0.0005% 重金属(以Pb计) ≤0.0052% 无水磷酸氢二钾,7758-11-4,Potassium phosphate dibasic anhydrous ACS级 项目名称 ACS Grade 含量(K2HPO4)Assay ≥98.0% 水不溶物Insoluble matter ≤0.01% 干燥失重Loss on drying ≤1.0% 氯化物(Cl)Chloride ≤0.003% 含氮化合物(以N计)Nitrogen compounds(as N) ≤0.001% 硫酸盐(SO4)Sulfate ≤0.005% 重金属(以Pb计)Heavy metals ≤5ppm 铁(Fe)Iron ≤0.001% 钠(Na)Sodium ≤0.05% 品级Grade 用于分子生物学 (for molecular biology, ≥99.0% (T)) 外观Appearance 白色粉末或结晶 纯度Purity 99.0 - 101.0 % (Titration by HCL) Aluminum (Al) ≤5.0 ppm Bismuth (Bi) ≤5.0 ppm Barium (Ba) ≤5.0 ppm Cadmium (Cd) ≤5.0 ppm Calcium (Ca) ≤10.0 ppm Cobalt (Co) ≤5.0 ppm Chromium (Cr) ≤5.0 ppm Copper (Cu) ≤5.0 ppm Iron (Fe) ≤5.0 ppm Lithium (Li) ≤5.0 ppm Magnesium (Mg) ≤5.0 ppm Manganese (Mn) ≤5.0 ppm Molybdenum (Mo) ≤5.0 ppm Sodium (Na) ≤5000.0 ppm Nickel (Ni) ≤5.0 ppm Lead (Pb) ≤5.0 ppm Strontium (Sr) ≤5.0 ppm Zinc (Zn) ≤5.0 ppm Arsenic (As) ≤0.1 ppm Chloride (CL) ≤50.0 ppm Sulfate ≤50.0 ppm DNAse, RNAse, Protease, Phosphatase None Detected 灼烧残渣Residue on ignition None Detected pH 8.7 - 9.3 C=1M, H2O at 25 °C λ 1 M in H2O UV absorption λ: 260 nm A: ≤0.20 λ: 280 nm A: ≤0.15 水溶解试验solubility in water Clear Colorless ,5.225g/30ml (1M), H2O 品级Grade 色谱纯 (grade for HPLC ) 外观Appearance 白色粉末或结晶 纯度Purity ≥99.0% (T) pH 8.7-9.3 (20 °C, 10% in H2O) 水溶行solubility H2O: soluble0.1 g/mL at 25 °C, clear, colorless λ 10 % in H2O UV absorption λ: 230 nm A: ≤0.1 λ: 240 nm A: ≤0.09 λ: 250 nm A: ≤0.08 λ: 310 nm A: ≤0.03 λ: 500 nm A: ≤0.02 RP gradient test Pass filter test Pass |