项目Item 分析纯
(AR)
质量吸收系数Absorbance,L/cm·g
α1(λ1,pH 3.8,干样) 24-28
α2(λ2,pH 5.4,干样) 53-58
乙醇溶解试验Solubility in ethanol 合格
干燥失重Drying loss,% ≤3.0
灼烧残渣(以硫酸盐计)Ignition residue,% ≤0.25
变色域Visual transition interval 3.8(黄绿)~5.4(蓝)
最大吸收波长(nm)Wave length of
max absorbance
λ1 (pH 3.8) 440-445
λ2 (pH 5.4) 615-618
品级Grade ACS级
(ACS reagent, Dye content 95 %)
外观Appearance 褐色至棕色粉末
红外光谱鉴别Infrared spectrometry Conforms
纯度Purity ≥95.0% (HPLC)
λ 422 - 426 nm
Extinction Coefficient ≥17000
c = 0.03g/l; Acified Methanol
Appearance (Clarity) Pass
Visual Interval Pass
pH 3.8 Yellow
Visual Interval Pass
pH 4.5 Green
Visual Interval Pass
pH 5.4 Blue |