巴比妥酸

Barbituric acid

CAS号:   67-52-7

分子式:   C4H4N2O3

分子量:   128.09

别名:      丙二酰脲，嘧啶三酮，丙二酰缩脲，巴比土酸

性状

含二分子结晶水者为白色结晶。在空气中风化，易溶于热水和稀酸，难溶于冷水。遇金属生成盐类。

熔点：248-255 ºC

质量标准

项目                                     CP

外观Appearance                          White to red crystals or powder

红外光谱鉴别Infrared spectrum           Conforms to strucure

纯度Purity(neutralization titration)    ≥98.0% 

熔点Melting point                       248°C - 255°C

项目                                    AR

外观Appearance                          白色至红色结晶粉末

红外光谱鉴别Infrared spectrometry       和对照匹配

纯度Purity                              ≥98.0% (中和滴定) 

熔点Melting point                       248°C - 255°C

干燥损失Loss on drying                  <0.5 %

重金属Heavy metals (as Pb)              <20 ppm

硫酸盐灰分Sulfated ash                  <0.2 %

项目                                     99.5%,用于糠醛衍生物的比色分析及氰化物

纯度Purity(HPLC)                         ≥99.5% (HPLC)

灼烧残渣ign. residue                     ≤0.05%

熔点Melting point                        248-252 °C (dec.)(lit.)

痕量阴离子anion traces

chloride (Cl-)                           ≤50 mg/kg

sulfate (SO42-)                          ≤500 mg/kg

痕量阳离子cation traces

Ca                                       ≤10 mg/kg

Cd                                       ≤5 mg/kg

Co                                       ≤5 mg/kg

Cr                                       ≤5 mg/kg

Cu                                       ≤5 mg/kg

Fe                                       ≤5 mg/kg

Mg                                       ≤10 mg/kg

Mn                                       ≤5 mg/kg

Ni                                       ≤5 mg/kg

Pb                                       ≤5 mg/kg

Zn                                       ≤5 mg/kg

用途

有机合成，比色测定糠醛及多戊糖