Merck, 1.09432.1000, Buffer solution

The buffer solution (glycine/sodium chloride/hydrogen chloride) is gravimetrically prepared using high-quality reagents. It is quality controlled and qualified in an ISO/IEC 17025 accredited calibration lab. Its pH value of 1.00 at 20°C is qualified 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.