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1.12939

Supelco

Lactose Standard 5 %

Certified Reference Material for Karl Fischer Titration Aquastar®

Synonym(s):

Lactose Standard 5 %, Milk sugar, Lactobiose

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About This Item

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

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)

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)

Related Categories

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, in accordance with ISO 760.

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

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 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.

Linkage

Replaces: 1.12939.0010

Analysis Note

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

Legal Information

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

reagent

Product No.
Description
Pricing

1.88001

CombiTitrant 1

1.88002

CombiTitrant 2

1.09257

CombiCoulomat fritless, Karl Fischer reagent for coulometric water determination for cells with and without diaphragm Aquastar®

1.88005

CombiTitrant 5, one-component reagent for volumetric Karl Fischer titration 1 ml ≙ ca. 5 mg H₂O Aquastar®

1.88009

CombiMethanol, Solvent for volumetric Karl Fischer titration with one component reagents max. 0.01% H₂O Aquastar®

1.88008

CombiSolvent, methanol-free solvent for volumetric Karl Fischer titration with one component reagents Aquastar®

1.88010

Titrant 5, titrant for volumetric Karl Fischer titration with two component reagents 1 ml ≙ ca. 5 mg H₂O Aquastar®

188079

Anolyte for coulometric Karl Fischer Titration without diaphragm Aquastar®

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

  • Specification Sheet

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