99%:
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外观Appearance 白色结晶粉末
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红外光谱鉴别Infrared spectrometry 符合
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纯度Purity (以干基计) ≥99.0%(滴定)
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干燥损失Loss on drying <1 % (120°C)
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重金属Heavy metals (as Pb) <5 ppm
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pH 4.8 ~ 5.4 (0.5 M 水溶液,20°C)
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氯离子Cl < 200 ppm
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硫酸根SO4 < 50 ppm
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重金属Heavy Metals (as Pb) <10PPM
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UV (5% 水溶液) (1 cm cell)
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250 nm A: <0.05
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99.5%:
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外观appearance white crystalline powder
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不溶物Insoluble matter, passes filter test
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灼烧残渣ign. residue ≤0.05% (as SO4)
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干燥损失loss on drying, 110 °C ≤0.5%
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pH 4.5-6.0 (25 °C, 0.5 M in H2O)
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useful pH range 7.4 - 8.8
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pKa (25 °C) 8.1
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水溶性solubility H2O: soluble0.5 M at 20 °C, clear, colorless
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氯离子chloride (Cl-): ≤500 ppm
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硫酸根sulfate (SO42-): ≤50 ppm
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Al: ≤5 ppm
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As: ≤0.1 ppm
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Ba: ≤5 ppm
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Bi: ≤5 ppm
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Ca: ≤10 ppm
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Cd: ≤5 ppm
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Co: ≤5 ppm
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Cr: ≤5 ppm
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Cu: ≤5 ppm
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Fe: ≤5 ppm
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K: ≤50 ppm
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Li: ≤5 ppm
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Mg: ≤5 ppm
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Mn: ≤5 ppm
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Mo: ≤5 ppm
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Na: ≤50 ppm
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Ni: ≤5 ppm
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Pb: ≤5 ppm
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Sr: ≤5 ppm
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Zn: ≤5 ppm
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λ 0.5 M in H2O
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紫外吸收UV absorption λ: 260 nm A: ≤0.03
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λ: 280 nm A: ≤ 0.02
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品级Grade 细胞培养级,≥99.5%(T)
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(for cell culture,≥99.5%(T) )
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外观appearance white crystalline powder
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水溶性solubility clear colorless solution at 20g plus 80ml of water
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红外光谱Infrared spectrometry Conforms to Structure
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水分water by karl fischer ≤ 0.2%
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紫外吸收uv absorbance ≤ 0.02 at 290nm (20%w/w)
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重金属heavy metals ≤ 5 ppm (as lead)
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纯度purity by NaOH titration ≥99.5%
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电泳实验electrophoretic test for use as a buffer component for separation of low molecular weight peptides Pass
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RNASE, DNASE, NICKASE AND PROTEASE none detected
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内毒素endotoxin assay ≤ 0.1 eu/mg
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平板计数standard plate count ≤ 100 cfu/g
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细胞培养测试cell culture test pass
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