項目Item 分析純
(AR)
質量吸收系數Absorbance,L/cm·g
α1(λ1,pH 3.8,干樣) 24-28
α2(λ2,pH 5.4,干樣) 53-58
乙醇溶解試驗Solubility in ethanol 合格
干燥失重Drying loss,% ≤3.0
灼燒殘渣(以硫酸鹽計)Ignition residue,% ≤0.25
變色域Visual transition interval 3.8(黃綠)~5.4(藍)
最大吸收波長(nm)Wave length of
max absorbance
λ1 (pH 3.8) 440-445
λ2 (pH 5.4) 615-618
品級Grade ACS級
(ACS reagent, Dye content 95 %)
外觀Appearance 褐色至棕色粉末
紅外光譜鑒別Infrared spectrometry Conforms
純度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 |