Product Overview

Ammonium Dihydrogen Phosphate 99% For HPLC (CAS No. 7722-76-1) is a monobasic ammonium phosphate used to provide controlled phosphate-ion concentration and mildly acidic buffering conditions in chromatographic solutions. Its dissolution supplies ammonium and dihydrogen phosphate ions, allowing adjustment of mobile-phase pH and ionic environment in separations involving compounds whose retention and peak behaviour are influenced by ionisation.

The HPLC grade is intended for chromatographic mobile-phase preparation, method development, and sample-solution work requiring controlled reagent quality. It is suitable for aqueous and compatible aqueous–organic mobile phases where ammonium dihydrogen phosphate is specified as a buffer component to support reproducible retention, selectivity, and chromatographic performance.

Typical Applications

• Preparation of phosphate-buffered HPLC mobile phases
• Control of mobile-phase pH and ionic composition
• Reversed-phase separation of suitable ionisable compounds
• Optimisation of retention and selectivity in buffer-dependent methods
• Preparation of chromatographic sample solutions and diluents
• Development and routine execution of phosphate-buffered HPLC procedures

Common Synonyms

• Monoammonium Phosphate
• Ammonium Phosphate Monobasic
• Monobasic Ammonium Phosphate
• Ammonium Dihydrogen Orthophosphate
• Monoammonium Orthophosphate
• Primary Ammonium Phosphate

Storage Conditions

Store in a tightly closed container in a cool, dry, and clean location. Protect the material from atmospheric moisture and contamination. Minimise exposure during dispensing and reseal the container promptly to preserve its chromatographic reagent quality.