CAS号: 877-24-7

分子式: C8H5KO4

分子量: 204.22

别名: 1,2-苯二甲酸氢钾;苯二甲酸氢钾

白色结晶。约溶于12份冷水、3份沸水；微溶于乙醇。0.05M水溶液在25℃时的pH=4.005。
熔点  295-300 °C (dec.)(lit.)
密度  1.006 g/mL at 20 °C
溶解度  H2O: 100 mg/mL, clear, colorless
水溶解性  80 G/L (20 ºC)

GB/T1291-88
项目ltem                                               分析纯
                                                              (AR)
含量(C₈H₅KO₄)Assay,%                   ≥ 99.8
pH(50g/L溶液,25℃)pH of water solution    3.8-4.2
澄清度试验Clarity                              合格
水不溶物lnsoluble matter in water,%    ≤ 0.005
干燥失重Drying loss,%                   ≤ 0.05
氯化物(Cl)Chloride,%                      ≤ 0.002
总氮量(N)Total nitrogen,%             ≤ 0.006
铵(NH₄)Ammonium,%                   ≤ 0.005
钠(Na)Sodium,%                             ≤ 0.01
铁(Fe)Iron,%                                     ≤ 0.0005
重金属(Pb)Heavy metals,%            ≤ 0.0005


Q/(HG)SJ783-1999
项目ltem                                                化学纯
                                                               (CP)
含量(C₈H₅KO₄)Assay,%                    ≥ 99.0
pH(50g/L溶液,25℃)pH of water solution    3.8-4.2
澄清度试验Clarity                              合格
水不溶物lnsoluble matter in water,%    ≤ 0.01
氯化物(Cl)Chloride,%                      ≤ 0.01
硫化合物(以SO₄计)Sulfur cos,%    ≤ 0.0012
铵(NH₄)Ammonium,%                    ≤ 0.01
钠(Na)Sodium,%                              ≤ 0.1
铁(Fe)Iron,%                                      ≤ 0.002
重金属(Pb)Heavy metals,%             ≤ 0.001


GB1257-89
项目ltem                                                     基准试剂
                                                                       (PT)
含量(C₈H₅KO₄)Assay,%                         ≥ 99.90～100.05
pH(50g/L溶液,25℃)pH of water solution    3.8-4.1
澄清度试验Clarity                                       合格
水不溶物lnsoluble matter in water,%    ≤ 0.003
氯化物(Cl)Chloride,%                               ≤ 0.002
硫化合物(以SO₄计) ,%                             ≤ 0.006
钠(Na)Sodium,%                                        ≤ 0.005
铁(Fe)Iron,%                                               ≤ 0.0005
重金属(Pb)Heavy metals,%                    ≤ 0.0005


ACS级
项目名称　                                              ACS Grade
含量(C₈H₅KO₄,干基)Assay                99.95-100.05%
pH(5%溶液,25.0±0.2℃)
pH(5% solution at 25.0±0.2℃)         4.00-4.02
水不溶物Insoluble matter                   ≤0.005%
氯化合物(Cl)Chloride compounds   ≤0.003%
硫化合物(以SO₄计)Sulfur compoun ≤0.002%
重金属(以Pb计)Heavy metals             ≤ 5ppm
铁(Fe)Iron                                              ≤5ppm
钠(Na)Sodium                                      ≤0.005%


品级Grade                               色谱纯  
                                     (grade for HPLC )
含量assay                             ≥99.8% (T)
pH                                    3.5-5.0
熔点mp                                295-300 °C (dec.)  
水溶解试验solubility H2O:             soluble100 mg/mL, 无色透明
λ 10 % in H2O
UV absorption
  λ: 330 nm A:                        ≤0.05
  λ: 340 nm A:                        ≤0.03
  λ: 350 nm A:                        ≤0.02
  λ: 500 nm A:                        ≤0.02


99.99% metals basis:


外观Appearance                          White Powder
X-射线衍射分析X-Ray Diffraction         Conforms to Structure
纯度Purity                              ≥99.99% Based on Trace Metals Impurities
ICP Major Analysis                      Confirms K component
总痕量金属杂质total metallic impurities   ≤200ppm by ICP Atomic emission