Skip to Content
Merck

Key Documents

View All Documentation

1.12939

Lactose Standard 5 %

Certified Reference Material for Karl Fischer Titration Aquastar®

Synonym(s):

Lactose Standard 5 %, Milk sugar, Lactobiose

Sign In to View Organizational & Contract Pricing.

Select a Size

Change View

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
Technical Service
Need help? Our team of experienced scientists is here for you.
Let Us Assist

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

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

Storage Class

11 - Combustible Solids

wgk

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library