Synonym:
KHP,
Phthalic acid monopotassium salt,
Potassium biphthalate,
Potassium hydrogen phthalate
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CAS Number 877-24-7
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Linear Formula HOOCC6H4COOK
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Molecular Weight 204.22
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Beilstein Registry Number 3637128
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EC Number 212-889-4
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MDL number MFCD00013070
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PubChem Substance ID 57648795
Properties:
Related Categories |
Analytical Reagents,
Analytical Reagents for General Use,
Analytical/Chromatography,
Essential Chemicals,
O-P, Puriss p.a.,
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InChI Key
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IWZKICVEHNUQTL-UHFFFAOYSA-M
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grade
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puriss. p.a.
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assay
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≥99.5%
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loss
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≤0.2% loss on drying, 105 °C
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pH
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4
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mp
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295-300 °C (dec.)(lit.)
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anion traces
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chloride (Cl-): ≤10 mg/kg
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sulfate (SO42-): ≤50 mg/kg
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cation traces
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Cd: ≤5 mg/kg
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Co: ≤5 mg/kg
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Cu: ≤5 mg/kg
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Fe: ≤5 mg/kg
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Na: ≤100 mg/kg
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Ni: ≤5 mg/kg
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Pb: ≤5 mg/kg
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Zn: ≤5 mg/kg
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Description:
Application
Potassium phthalate monobasic may be used as a buffer to maintain pH = 2.39 and 4.52, during the dispersive ionic liquid-liquid microextraction coupled with liquid chromatography and UV detection of drug (benznidazole and nifurtimox) levels in human plasma. It has been used as internal standard certified reference material (CRM) for the high performance (HP)-quantitative NMR spectroscopic (qNMR) determination of various organic compounds.
General description
Potassium phthalate monobasic is the monopotassium salt of phthalic acid. It has been proposed as a certified reference material (CRM) under ISO/IEC 17025 and ISO Guide 34 accreditation. Its spectral shift, multiplicity, solubility and relaxation times in different solvents have been reported.
Safety:
Personal Protective Equipment
Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter
RIDADR
NONH for all modes of transport