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

危险品标志                             Xi,C 
    
危险类别码                             36/38-36/37/38-34 
    
安全说明                                26-36-24/25-22-45-36/37/39 
    
危险品运输编号                     UN 1789 8/PG 3 
    
WGK Germany                      1
    
RTECS                                  CZ4326000
    
F                                             34

1.滴定分析中的基准物质，用作制备标准碱溶液的基准试剂和测定pH值的缓冲剂。
    2.与氢氧化钠反应生成邻苯二甲酸钾纳。
3.有机试剂，医药中间体;
本品应密封保存