性 狀：    無(wú)色單斜結(jié)晶或白色結(jié)晶性粉末。在空氣中穩(wěn)定,能溶于水，微溶于醇。溶于約12份冷水、3份沸水，微溶于乙醇。溶液呈酸性。25℃ 0.05mol/L水溶液的pH為4.005。
密度:1.636
熔點(diǎn):295～300℃
   

質(zhì)量標(biāo)準(zhǔn)：       
   GB/T1291-88
項(xiàng)目ltem                        分析純
                                          (AR)
含量(C8H5KO4)Assay,%                   ≥ 99.8
pH(50g/L溶液,25℃)pH of water solution    3.8-4.2
澄清度試驗(yàn)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
總氮量(N)Total nitrogen,%              ≤ 0.006
銨(NH4)Ammonium,%                      ≤ 0.005
鈉(Na)Sodium,%                         ≤ 0.01
鐵(Fe)Iron,%                           ≤ 0.0005
重金屬(Pb)Heavy metals,%               ≤ 0.0005

Q/(HG)SJ783-1999
項(xiàng)目ltem                                 化學(xué)純
                                          (CP)
含量(C8H5KO4)Assay,%                   ≥ 99.0
pH(50g/L溶液,25℃)pH of water solution    3.8-4.2
澄清度試驗(yàn)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計(jì))Sulfur compounds,%    ≤ 0.0012
銨(NH4)Ammonium,%                      ≤ 0.01
鈉(Na)Sodium,%                         ≤ 0.1
鐵(Fe)Iron,%                           ≤ 0.002
重金屬(Pb)Heavy metals,%               ≤ 0.001

GB1257-89
項(xiàng)目ltem                                 基準(zhǔn)試劑
                                           (PT)
含量(C8H5KO4)Assay,%                   ≥ 99.95～100.05
pH(50g/L溶液,25℃)pH of water solution    3.8-4.1
澄清度試驗(yàn)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計(jì))Sulfur compounds,%    ≤ 0.006
鈉(Na)Sodium,%                         ≤ 0.005
鐵(Fe)Iron,%                           ≤ 0.0005
重金屬(Pb)Heavy metals,%               ≤ 0.0005

ACS級(jí)
項(xiàng)目名稱                               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計(jì))Sulfur compounds      ≤0.002%
重金屬(以Pb計(jì))Heavy metals             ≤ 5ppm
鐵(Fe)Iron                             ≤5ppm
鈉(Na)Sodium                           ≤0.005%

品級(jí)Grade                               色譜純  
                                     (grade for HPLC )
含量assay                             ≥99.8% (T)
pH                                    3.5-5.0
熔點(diǎn)mp                                295-300 °C (dec.)  
水溶解試驗(yàn)solubility H2O:             soluble100 mg/mL, 無(wú)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

貯 存：    密封保存。
用途  分析試劑。標(biāo)定堿的基準(zhǔn)物，配制緩沖溶液    

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