邻苯二甲酸氢钾

Potassium hydrogen phthalate

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

性状

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)

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 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

用途

用途  用作pH测定的缓冲剂、分析基准物质。

用途  用作分析试剂和缓冲剂，用作烟火鸣叫剂

危险性质

危险品标志  Xi,C

WGK Germany  1

RTECS号 CZ4326000

F  34

危险类别码  36/38-36/37/38-34

安全说明  26-36-24/25-22-45-36/37/39