Certified buffer solution at pH 5.00 (20 °C) prepared from citric acid and sodium hydroxide, traceable to primary reference standards (NIST, PTB), for calibration and quality control in analytical labs.
Buffer Solution pH 5.00 (20 °C), catalogue No. 109436, is a certified reference material supplied by MilliporeSigma / Merck under the Certipur product line. This ready-to-use buffer solution is prepared gravimetrically from high-quality citric acid and sodium hydroxide reagents in high-purity water and is qualified using accredited calibration procedures. The pH value of 5.00 at 20 °C is traceable to primary reference standards from NIST (National Institute of Standards and Technology) and PTB (Physikalisch-Technische Bundesanstalt), ensuring reliable calibration and quality control of pH measurement systems in analytical laboratories.
Advantages
- Certified buffer solution with well-defined pH 5.00 at 20 °C.
- Traceable to SRMs from NIST and primary standards from PTB.
- Prepared and qualified in ISO/IEC 17025 and ISO 17034 accredited laboratories.
- Ready to use without additional preparation.
- Suitable for calibration, QC and validation of pH electrodes and instruments.
- Convenient liquid format for routine laboratory workflows.
Technical specifications
| Product type | Certified buffer solution |
| Buffer components | Citric acid / sodium hydroxide |
| pH at 20 °C | 5.00 |
| Traceability | NIST and PTB primary reference standards |
| Qualification | ISO/IEC 17025 & ISO 17034 accredited laboratory |
| Typical applications | Calibration and QC of pH measurement systems |
| Format | Liquid ready-to-use solution |
| Storage conditions | 15–25 °C |
| Brand | Merck |
