质量标准: 质量标准
Q/(HG)SJ 668-95
项目Item 指示剂
(Ind)
含量(以硫酸钠计)Assay,% ≥18.5~22.0
pH变色域Visnal transition interval 3.0(红)~4.4(黄)
灵敏度Sensitivity 合格
水不溶物Insoluble matter in water,% ≤0.15
氧化物Oxide 合格
品级Grade ACS级
(ACS reagent, Dye content 85 %)
外观Appearance 橙色粉末
红外光谱鉴别Infrared spectrometry Conforms
染料含量Dye content ≥85.0%
澄清度试验Claroty of solution 合格
pH变色域 Visnal transition interva 3.2(红)-4.4(黄)
Visual Interval PH 3.0 = Pink or Red
Visual Interval pH 3.2 = Pinkish-Orange
Visual Interval pH 4.4 = Yellow
紫外吸收UV absorption λmax 505 nm