项目 分析纯 (AR) 不饱和化合物unsaturated compounds ≤0.75% 沸程boiling range 96.0~98.0℃ 含量Assay ≥99.0% 相对密度Specific gravity (20/20°C) 0.803~0.805 醛aldehydes ≤0.2% 酸度Acidity(以H+计)/(mmol/100g) ≤0.05 折光率Refractive index n20/D 1.3845~1.3855 蒸发残渣Evaporation residue ≤0.002% 酯ester ≤0.1%
项目 化学纯 (CP) 不饱和化合物unsaturated compounds ≤0.1% 沸程boiling range 96.0~98.0℃ 含量Assay ≥98.5% 相对密度Specific gravity (20/20°C) 0.803~0.805 醛aldehydes ≤0.2% 酸度Acidity(以H+计)/(mmol/100g) ≤0.1 折光率Refractive index n20/D 1.384~1.386 蒸发残渣Evaporation residue ≤0.003% 酯ester ≤0.1%
项目 色谱纯 (HPLC) 外观Appearance 无色透明液体 纯度Purity >99.8% (GC) 非挥发性物质Non-volatile matter <0.0003 % >游离酸Free acid (C3H6O2) <0.001 % >水份Water <0.05 % >紫外吸光值UV (1 cm cell vs HPLC级水) : 210 nm A: <0.70 > 220 nm A: <0.3 > 250 nm A: <0.05 >
ACS级 项目名称Item ACS Grade 含量Assay ≥99.5% 溶解性试验Solubility in water Passes 色度,黑曾单位Color(APHA) 10 蒸发残渣Residue after evaporation ≤0.001% 可滴定酸Titrable acid ≤0.0004meq/g 羰基化合物(以C2H5OH计)Carbonly compounds ≤0.03% 乙醇Ethyl alcohol ≤0.01% 甲醇Methanol ≤0.01% 异丙醇Isooropyl alchol ≤0.05% 水Water ≤0.2% |