1.01961
Potassium tetraoxalate dihydrate
certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.679 (25°C) Certipur®
别名:
Potassium tetraoxalate dihydrate, Oxalic acid hemipotassium salt, Potassium hydrogen oxalate-oxalic acid-water (1/1/2)
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关于此项目
经验公式（希尔记法）:
C4H3KO8 · 2H2O
化学文摘社编号:
分子量:
254.19
UNSPSC Code:
41116107
EC Index Number:
204-874-6
NACRES:
NA.24
MDL number:
grade
certified reference material
Quality Segment
agency
complies with DIN 19266
product line
Certipur®
pH
1.7 (25 °C, 12.6 g/L in H2O)
solubility
25 g/L
density
1.84 g/cm3 at 20 °C
bulk density
860 kg/m3
application(s)
environmental
food and beverages
general analytical
industrial qc
pharmaceutical
format
neat
storage temp.
15-25°C
SMILES string
[K+].[O-]C(=O)C(=O)O.[O-]C(=O)C(=O)O.[H+]
InChI
1S/2C2H2O4.K/c2*3-1(4)2(5)6;/h2*(H,3,4)(H,5,6);/q;;+1/p-1
InChI key
GANDVAJEIJXBQJ-UHFFFAOYSA-M
General description
Certipur® certified secondary standard reference buffers are used to precisely calibrate and monitor pH measurement instruments and buffer solutions. They are quality controlled and qualified in our ISO/IEC 17025 and ISO 17034 accredited calibration laboratories against certified primary standard reference materials (SRM) in compliance with DIN 19266, IUPAC, NIST, Ph. Eur and USP. Certipur® reference materials offer maximum accuracy, reliability and convenience and help avoid costly repeat analyses.
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.
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.
Application
Potassium tetraoxalate dihydrate [pH (S) = 1.67₉ (25 °C)] is a certified secondary standard reference material used as a calibration buffer standard for pH instruments or pH electrodes.
Features and Benefits
- The product is delivered with a comprehensive, batch-specific Certificate of Analysis showing the relevant data for the quality management system.
- The pH value of this Certipur® buffer solution is qualified using differential potentiometry with two platinum hydrogen electrodes against NIST & PTB primary reference materials [pH (S) = 1.679 (25 °C)].
- This buffer standard has a guaranteed shelf life of 4 years.
- Potassium tetraoxalate dihydrate buffer is a Certified Reference Material (CRM) offered in neat format. Solution of this standard is prepared in-house following instructions in European Pharmacopoeia (Ph. Eur. 2.2.3).
- Intended for extremely precise calibration, qualification and monitoring of pH instruments and routine assessment of their performance.
Analysis Note
pH-value (25 °C): 1.674 - 1.683
Legal Information
CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany
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Warning
hcodes
Hazard Classifications
Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Irrit. 2
存储类别
11 - Combustible Solids
wgk
WGK 1