Product Overview

Potassium Hydrogen Phthalate 99.5% For HPLC (CAS No. 877-24-7) is the monopotassium salt of phthalic acid, providing a phthalate system with useful weak-acid buffering and ultraviolet-absorbing aromatic character. In specialised liquid-chromatographic methods, potassium hydrogen phthalate may function as an eluent component, ionic chromophore or buffer constituent where the analytical procedure deliberately exploits phthalate chemistry.

The HPLC grade is intended for methods that specifically call for potassium hydrogen phthalate in mobile-phase, eluent or chromatographic reagent preparation. Its role is particularly relevant in selected indirect UV and ion-chromatographic procedures rather than as a universal HPLC buffer.

Typical Applications

• HPLC and ion-chromatographic mobile phases where potassium hydrogen phthalate is the specified eluent component.
• Indirect UV-detection systems in which phthalate provides the absorbing mobile-phase background.
• Chromatographic determination of inorganic anions using KHP-based eluents.
• HPLC mobile-phase preparation for selected metal-ion or chelate separations.
• Preparation of weakly acidic chromatographic buffers and diluents where KHP is method-specified.
• HPLC method development involving phthalate eluent concentration, pH or ionic conditions.

Common Synonyms

• Potassium acid phthalate
• Potassium biphthalate
• Hydrogen potassium phthalate
• Potassium hydrogen benzene-1,2-dicarboxylate
• KHP

Storage Conditions

Store tightly closed in dry, clean conditions and protect from particulate, ionic and organic contamination. For HPLC use, maintain careful dispensing practices so that unintended contaminants do not increase chromatographic background or alter eluent composition.