Buffer Solution

General description
It is a certified buffer solution of citric acid/sodium hydroxide/hydrogen chloride, gravimetrically prepared using high-quality reagents at a registered calibration laboratory. It has a pH value of 2.00 at 25°C, measured using a combined glass electrode following a 5-point calibration method. The measurement is made in accordance with DIN 19268 using reference buffer solutions compliant to DIN 19266, NIST, IUPAC, Ph. Eur, and USP. The pH value of the buffer solution depends on the temperature and therefore a constant temperature must be maintained during its use.
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.
Application
The buffer solution is used as a standard in analytical procedures for the calibration of pH measuring instruments or pH electrodes and as a control for the measurement of pH of other solutions.
Features and Benefits
Measured and qualified at an ISO/IEC 17025 and ISO 17034 accredited laboratory
Directly traceable to secondary reference standards from NIST and primary certified reference materials from PTB
Ready-to-use solution available in 30 mL sachets
Accompanied with a detailed and batch-specific certificate of analysis (CoA) for an effective quality management system
Product label follows the ISO Guide 31 and contains information about ordering number, article description, lot number, safety data, and expiry date
Packaging material subjected to comprehensive stability studies as per ISO Guide 35
An uncertainty of +/- 0.02 in the pH value at 25°C
Legal Information
CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany