1.12939

Lactose Standard 5 %

Certified Reference Material for Karl Fischer Titration Aquastar^®

• Synonym(s): Lactose Standard 5 %, Milk sugar, Lactobiose
• Empirical Formula (Hill Notation): C₁₂H₂₂O₁₁ · xH₂O
• CAS Number: 10039-26-6
• Molecular Weight: 342.30 (anhydrous basis)
• MDL number: MFCD00064074
• UNSPSC Code: 41116107
• EC Index Number: 200-559-2
• NACRES: NA.24

Properties

• grade: certified reference material
• Quality Level: 300
• Agency: ISO 17025, 17034
• product line: Aquastar^®
• form: solid
• autoignition temp.: 390 °C
• potency: >10000 mg/kg LD₅₀, oral (Rat)
• reaction suitability: reaction type: water standard for Karl Fischer titration
• packaging: ampule of 10 g
• technique(s): Karl-Fischer titration: suitable; titration: suitable
• pH: 4.0-6.5 (20 °C, 100 g/L in H₂O)
• mp: 202 °C
• bulk density: 500 kg/m³
• format: neat
• storage temp.: 15-25°C
• SMILES string: O1[C@H]([C@@H]([C@H]([C@H]([C@H]1CO)O)O)O)O[C@@H]2[C@H](O[C@@H]([C@@H]([C@H]2O)O)O)CO
• InChI: 1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5+,6+,7-,8-,9-,10-,11+,12+/m1/s1
• InChI key: GUBGYTABKSRVRQ-XLOQQCSPSA-N

Description

General description

The lactose standard 5% is a solid standard, prepared gravimetrically from high-purity reagents. It is analyzed in an ISO/IEC 17025 and ISO 17034 accredited calibration laboratory. Its water content of 5% is measured by the coulometric Karl Fischer oven method at 150°C with an extraction time of 300 seconds.

Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.

In our effort to be more sustainable, we′re going digital with COAs-download them directly from our website. Download your certificate at https://www.sigmaaldrich.com/US/en/documents-search to view certified values, including uncertainty and expiry date.

Application

Lactose standard 5% is used as a certified reference material (CRM) for both the coulometric and volumetric Karl Fischer water determinations, with or without the Karl Fischer oven. It is particularly suitable when the working medium used consists of solvents mixtures in which sodium tartrate dihydrate is slightly soluble. And it is used as an oven standard in the preferred temperature range of 140°C -190°C.

Features and Benefits

• Available in a secure plastic bottle with the material subjected to stability and homogeneity studies, following ISO 17034 and ISO Guide 35
• High-quality offering accurate and reliable results
• Accompanied with a comprehensive and batch-specific digital certificate of analysis (CoA) for an effective quality management system
• Measured and qualified in an ISO/IEC 17025 and ISO 17034 accredited laboratory

Packaging

SKU-pack size numbers ending with a "3" are SmartChemicals with an RFID tag on the label for seamless data transfer to the instrument, e.g. xxxxxx1003 or xxxxxxx 4003. More information on www.sigmaaldrich.com/SmartChemicals.

Analysis Note

Water content: 5.00 - 5.20 %
Measurement method: coulometric according Karl Fischer
extended measuring uncertainly: +/- 0.05 %

Other Notes

Replaces: 1.12939.0010

Legal Information

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

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 2
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable