外觀Appearance 橙色至棕色粉末紅外光譜鑒別Infrared spectrometry Conforms純度Purity ≥98.0% (HPLC area%) 水溶解試驗solubility in hot Water 合格水溶解試驗solubility in hot EtOH 合格干燥損失Drying loss ≤10.0 %灼燒殘渣Ignition residue(Sulfate) 20.0 - 30.0 %(after drying)pH變色域Transition interval(pH) (紅黃色)10.0 - 12.0(黃紅色)吸光度Absorbance(以干基計) ≤0.320(5 mg/L, pH 9.6, 375.0 nm)
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