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Potassium dihydrogen phosphate/ di-sodium hydrogen phosphate

certified reference material, traceable to NIST (SRM), traceable to PTB


certified reference material

Quality Level


traceable to NIST (SRM)
traceable to PTB

storage temp.


General description

Certipur® certified secondary standard reference materials are used to precisely calibrate and monitor pH measurement instruments and buffer solutions. They are analyzed in our ISO/IEC 17025 and ISO 17034 accredited calibration laboratories against certified primary standard reference materials (SRM) in accordance with DIN 19266, IUPAC, NIST, Ph. Eur and USP. Certipur® reference materials offer maximum accuracy, reliability and convenience and help avoid costly repeat analyses.


Potassium dihydrogen phosphate/ di-sodium hydrogen phosphate [pH(S)=6.86₅ /pH(S)=7.41₃ (25 °C)] is a certified secondary standard buffer solution used as a calibration buffer standard for pH instruments or pH electrodes.


2, 25 g in fiber case

Features and Benefits

  • The product is delivered with a comprehensive, batch-specific Certificate of Analysis showing the relevant data for the quality management system.
  • The pH value of this Certipur® buffer solution is qualified using differential potentiometry with two platinum hydrogen electrodes against NIST & PTB primary reference materials [pH(S)=6.865 /pH(S)=7.413 (25 °C))].
  • This buffer standard has a guaranteed shelf life of 4 years.
  • It is a Certified Reference Material (CRM) offered in neat format. Solution of this standard is prepared in-house per instructions in European Pharmacopoeia (Ph. Eur. 2.2.3).
  • Intended for extremely precise calibration, qualification and monitoring of pH instruments and routine assessment of their performance.

Analysis Note

pH-value (25 °C): 6.861 - 6.867

Legal Information

CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany

Storage Class Code

13 - Non Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Quality

Enter Lot Number to search for Certificate of Quality (COQ).

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