质量标准
≥98.0%
外观Appearance White Crystalline Powder
红外光谱Infrared spectrometry Conforms to Structure
水溶性Solubility Colorless ,Clear ,at 15 g plus 85 ml of H2O
水分Water (by Karl Fischer) ≤1.0 %
A290 UV absorbance (15% W/W) ≤0.05
重金属Heavy Metals(As Lead) ≤5 ppm
纯度Purity (Titr. by NAOH) anhyd. ≥98.0 %
品级Grade 超纯级, ≥99.0% (HPLC)
(Ultra pure, ≥99.0% (HPLC))
外观Appearance White Crystalline Powder
纯度Purity(HPLC) ≥99.0%
不溶物insoluble matter, passes filter test
灼烧残渣ign. residue ≤0.05%
干燥损失loss on drying, 110 °C ≤1%
pH(25 °C, 0.5 M in H2O) 3.5-6.0
useful pH range 9.7 - 11.1
pKa 10.4
水溶性solubility H2O: soluble0.5 M at 20 °C, clear, colorless
氯chloride (Cl-): ≤50 ppm
硫酸根sulfate (SO42-): ≤150 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 0.05 M in H2O
UV absorption λ: 260 nm A: ≤0.04
UV absorption λ: 280 nm A: ≤0.04