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Water standard 0.1%

Standard for coulometric Karl Fischer Titration 1 g ≙ 1 mg H₂O Aquastar®

Quality Level


ISO 17025, 17034

product line




autoignition temp.

287 °C (Information refers to the main component.)

expl. lim.

1.7-11.5 % (v/v) Information refers to the main component.)


Karl-Fischer titration: suitable
titration: suitable


119 °C/1013 hPa

transition temp

flash point 31 °C (Information refers to the main component.)


0.92 g/cm3 at 20 °C


single component solution

storage temp.


General description

The 0.1% water standard is prepared gravimetrically from high-purity water and reagents. Its characterization is performed at an accredited quality control (QC) laboratory according to DIN EN ISO/IEC 17025. The water content of the standard is measured by direct coulometric Karl Fischer titration following ISO 760.


It is used as a certified reference material (CRM) to verify the accuracy of coulometric Karl Fischer titrators according to ISO 9001 chapter 7.1.5 “Monitoring and measuring resources”. It can also be used to check the accuracy of measured results according to European Pharmacopeia (Ph.Eur.) chapter 2.5.32 “Water Micro Determination.” Although preferable for use in coulometric method, it can be used to verify the low water content by volumetric method.

Features and Benefits

  • Packed in convenient 8 mL glass ampoules with 10 single-use ampoules in a box
  • Supplied with a batch-specific certificate of analysis (CoA) having data on exact measured water content of the batch, uncertainty, method of analysis, the NIST batch, and minimum shelf life
  • Measured and qualified in an ISO/IEC 17025 and ISO 17034 accredited laboratory
  • Directly traceable to SI unit (kg) and verified by SRM 2890 from NIST


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

Analysis Note

Assay (H₂O): 0.970 - 1.030 mg/g

Legal Information

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


FlameExclamation mark

Signal Word


Hazard Statements

Hazard Classifications

Flam. Liq. 3 - STOT SE 3

Target Organs

Central nervous system

Storage Class Code

3 - Flammable liquids



Flash Point(F)

87.8 °F - Information refers to the main component.

Flash Point(C)

31 °C - Information refers to the main component.

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Quality

Enter Lot Number to search for Certificate of Quality (COQ).


Tips & Tricks: Karl Fischer Titration - Measuring Water Content of Samples that do not Easily Release Water

Tips and tricks to completely release water from samples using internal extraction, external extraction and Karl Fischer oven method for accurate determination of water content by Karl Fischer titration method.

Titration 4.0

SmartChemicals enable wireless transfer of CoA data stored on an RFID tag on the consumable bottle to the titrator, reducing effort and chance for human error. Crucial data required for the application is transmitted safely, reliably and intelligently to the instrument.


Determination of Water in Cannabis & Hemp by Karl Fischer Titration

The article describes Karl Fischer titration (coulometry with oven and direct volumetric titration with external extraction) in comparison to the loss on drying method for accurate determination of water content in hemp samples.

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