Sigma-Aldrich Certified Sec. Standard Re

Grade

certified reference material

Quality Level

300

Agency

complies with DIN 19266

Product Line

Certipur^®

Ph

1.7 (25 °C in H₂O)

Density

1.003 g/cm³at 20 °C

Application(S)

environmental
food and beverages
general analytical
industrial qc
pharmaceutical

Format

mixture

Storage Temp.

15-25°C

Related Categories

Physical & Chemical Property Standards

General Description

The potassium tetraoxalate dihydrate certified secondary standard reference buffer solution is gravimetrically prepared using high-quality salt in high-purity water. Its pH value is measured by differential potentiometry with two platinum hydrogen electrodes against primary certified reference materials from NIST & PTB. The pH qualification is based on the 5-point calibration method, following 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.

Application

It can be used to calibrate, qualify, and monitor pH measuring instruments and as a control for testing other buffer solutions.

Features And Benefits

• Available in a safe 100 mL high-density plastic bottle in solution format
• Subjected to detailed stability studies as per ISO Guide 35
• Product label carrying relevant information on order number, article description, lot number, expiry date and safety data, in accordance with ISO Guide 31
• Accompanied with a detailed and batch-specific certificate of analysis (CoA) for an effective quality management system
• Measured and qualified in ISO/IEC 17025 and ISO 17034 accredited laboratory
• Traceable to SRMs from NIST and primary certified reference standards from PTB

Analysis Note

pH-value: 1.674 - 1.683
For complete data see the enclosed certificateCERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany