99%:
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外观Appearance White Crystalline Powder
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可溶性Solubility Colorless,Clear,25% (w/w), H2O
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水分Water (by Karl Fischer) ≤0.2 %
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紫外吸收UV Absorbance 290nm ≤0.05,25% (w/w)
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红外光谱Infrared spectrum Conforms to Structure
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重金属Heavy Metals(As Pb) ≤5 ppm
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纯化Purity (Titr. by NAOH) anhyd. ≥99 %
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品级Grade 超纯级,≥99.5% (T)
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(Ultra pure, ≥99.5% (T))
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外观Appearance White Crystalline Powder
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红外光谱Infrared spectrum Conforms to Structure
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含量assay ≥99.5% (T)
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不溶物insoluble matter, passes filter test
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灼烧残渣Residue On Ignition ≤0.1%
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干燥失重loss on drying, 20 °C (HV) ≤0.1%
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pH 4.0-5.5 (25 °C, 1 M in H2O)
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useful pH range 7.6 - 9.0
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pKa (25 °C) 8.3
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水溶性solubility H2O: soluble1 M at 20 °C, clear, colorless
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氯chloride (Cl-): ≤50 ppm
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硫酸根sulfate (SO42-): ≤50 ppm
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cation traces 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: ≤20 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 1 M in H2O
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UV absorption λ: 260 nm A: ≤0.070
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UV absorption λ: 280 nm A: ≤0.040
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