商品名：苯二甲酸氢钾

别 名：苯二甲酸氢钾,酞酸氢钾,1,2-苯二甲酸单钾盐
Potassium phthalate monobasic
KHP
Phthalic acid monopotassium salt
Potassium hydrogen phthalate

英文名：Potassium biphthalate

产 地：湖南

Cas号：877-24-7

MDL：MFCD00013070

Beilstein：3637128

EINECS：212-889-4

分子结构：

分子式：C8H5KO4； HOOCC6H4COOK

分子量：204.2200

备注：

性状：无色单斜结晶或白色结晶性粉末。在空气中稳定,能溶于水，微溶于醇。溶于约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为4.005。
密度:1.636
熔点:295～300℃

质量标准：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 compounds,%    ≤ 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)Sulfur compounds,%    ≤ 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 compounds      ≤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

存储：密封保存。

用途：分析试剂。标定碱的基准物，配制缓冲溶液。

联合编号：

RISK：

Safety：

Hazard：