| 质量标准： |
99%:
纯度assay ≥99.0%(T)
水分Moistrue ≤0.5%
氯Chloride ≤0.05%
重金属Heavy Metals （as Pb) <5PPM
灼烧残渣Residue On Ignition ≤0.1%
pH(1%;H2O) 4.1-4.5（20℃）
A260(1M,water): ≤0.095
A280(1M,water): ≤0.080
99.5%:
含量assay ≥99.5% (T)
灼烧残渣Residue on ignition(900 °C) ≤0.05%
pH 2.5-5.0 (25 °C, 1 M in H2O)
useful pH range 6.4 - 7.8
pKa (25 °C) 7.1
水溶性solubility H2O: soluble1 M at 20 °C, clear, colorless
氯(Cl-): ≤50 ppm
硫酸根sulfate (SO42-): ≤100 ppm
cation traces by ICP Atomic emission
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
UV absorption
λ: 260 nm A: ≤0.095
λ: 280 nm A: ≤0.080
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(900 °C) ≤0.05%
pH 2.5-5.0 (25 °C, 1 M in H2O)
useful pH range 6.4 - 7.8
pKa (25 °C) 7.1
水溶性solubility H2O: soluble1 M at 20 °C, clear, colorless
氯(Cl-): ≤50 ppm
硫酸根sulfate (SO42-): ≤100 ppm
cation traces by ICP Atomic emission
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
UV absorption
λ: 260 nm A: ≤0.095
λ: 280 nm A: ≤0.080
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