1.09435

Buffer solution

(citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 4.00 (20°C) Certipur^®

• Synonym(s): Buffer solution pH 4.00 (20°C) (citric acid/sodium hydroxide/hydrogen chloride)
• UNSPSC Code: 12161704
• NACRES: NA.25

Properties

• grade: certified reference material
• Quality Level: 300
• product line: Certipur^®
• pH: 4.0 (20 °C in H₂O)
• density: 1.01 g/cm³ at 20 °C
• application(s): environmental; food and beverages; general analytical; industrial qc; pharmaceutical
• format: mixture
• storage temp.: 15-25°C

Description

General description

The buffer solution (citric acid/sodium hydroxide/hydrogen chloride) is gravimetrically prepared using high-quality reagents in high-purity water. It is quality controlled and qualified in an ISO/IEC 17025 accredited calibration lab. Its pH value of 4.00 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, IUPAC, NIST, USP, and Ph. Eur.

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 is used in analytical procedures for calibration, qualification, and monitoring of pH measuring instruments and as a control for testing other buffer solutions.

Features and Benefits

• Measured and qualified in an 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 and an innovative Titripac^® packaging for positive environmental impact due to reduced waste generation
• Long-lasting with a shelf life of 3 years
• Accompanied with a batch-specific and detailed certificate of analysis (CoA) for an effective audit

Legal Information

CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany

Titripac is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class: 12 - Non Combustible Liquids
• wgk_germany: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable