| 质量标准： |
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%
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
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