Buffer solution

Application
The buffer solution is used in analytical procedures for the calibration, qualification, and monitoring of pH measuring instruments and as a control for testing other buffer solutions.
Features and Benefits
Measured and qualified in a ISO/IEC 17025 and ISO 17034 accredited laboratory
Traceable to SRMs from NIST and primary certified reference standards from PTB
Ready-to-use solution available in a sealed bottle with convenient packaging to protect against contamination
Long-lasting with a shelf life of 3 years
Accompanied with a detailed certificate of analysis (CoA) for an effective audit
General description
Also known as an acetate buffer, it is prepared gravimetrically with acetic acid, sodium acetate, and high-purity water. This acetic acid/sodium acetate buffer is analyzed using a combined glass electrode following a 5-point calibration method, in accordance with DIN 19268, against certified primary reference standards as per DIN 19266.
Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.
Legal Information
CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany