质量标准
项目 生化试剂级
BC
纯度assay ≥99%(T)
水分Moistrue ≤0.5%
重金属Heavy Metals <5PPM
pH(1% in H2O) 4.7-6.0
项目 超纯级
纯度assay ≥99.5%(T)
红外光谱Infrared Complies
水分Moistrue ≤0.5%
钙Ca <10PPM
铁Iron(Fe) <5PPM
氯Chloride ≤0.005%
硫酸根Sulfate ≤0.005%
重金属Heavy Metals (as Pb) <3PPM
pH(1% in H2O) 4.7-6.0
A260(1M,water): ≤0.05
A280(1M,water): ≤0.04
品级Grade 分子生物学级
(for molecular biology, ≥99.5% (T))
含量assay ≥99.5% (T)
DNA酶DNases, none detected
RND酶RNases, none detected
不溶物insoluble matter, passes filter test
磷酸酶phosphatases, none detected
蛋白酶proteases, none detected
灼烧残渣Residue on ignition ≤0.1% (as SO4)
干燥损失loss on drying ≤0.5% , 110 °C
pH 5.0-6.5 (25 °C, 1 M in H2O)
useful pH range 6.8 - 8.2
pKa (25 °C) 7.5
水溶性solubility H2O: soluble1 M at 20 °C, clear, colorless
氯chloride (Cl-): ≤50 ppm
硫酸根sulfate (SO42-): ≤50 ppm
Al: ≤5 ppm
As: ≤0.1 ppm
Ba: ≤5 ppm
Bi: ≤5 ppm
Ca: ≤10 ppm
Cd: ≤5 ppm
Co: ≤5 ppm
Cr: ≤5 ppm
Cu: ≤5 ppm
Fe: ≤5 ppm
K: ≤50 ppm
Li: ≤5 ppm
Mg: ≤5 ppm
Mn: ≤5 ppm
Mo: ≤5 ppm
Na: ≤50 ppm
Ni: ≤5 ppm
Pb: ≤5 ppm
Sr: ≤5 ppm
Zn: ≤5 ppm
λ 1 M in H2O
紫外吸收UV absorption
λ: 260 nm A: ≤0.045
λ: 280 nm A: ≤0.035