Merck Supelco Aquastar Karl Fischer Reagents

Aquastar Karl Fischer Reagents

Aquastar® reagents for Karl Fischer titration enable determination of water content in gaseous, liquid and solid samples with high accuracy and reliability. Our high-quality Aquastar® product portfolio comprises a whole range of Karl Fischer reagents for volumetric and coulometric determinations. In addition, for monitoring and qualifying Karl Fischer instruments, checking measuring results and determining the titer of the reagents, we offer various types of water standards.

Using Karl Fischer titration together with Aquastar reagents and standards, the water content of gases, liquids and solids can easily be determined with a high degree of accuracy. Our Aquastar product line provides you with excellent volumetric and coulometric Karl Fischer reagents and a wide range of distinguished water standards for titer determination, instrument check and testing during and after the Karl Fischer determination.

Product Table

Principle of the Volumetric Karl Fischer Titration

In volumetric Karl Fischer titration, the basis for the determination of water content is the oxidation of sulfur dioxide by iodine in the presence of water. The water content of the sample is determined by measuring the volume of Karl Fischer titrant, consisting of an alcohol, a buffer base, sulfur dioxide, and a known concentration of iodine, which is required to reach the titration endpoint. The sample is completely dissolved or dispersed in a suitable solvent with strict exclusion of atmospheric moisture and then titrated with the Karl Fischer titrant. When all the water in the sample is consumed, the resulting excess of iodine can be determined potentiometrically.

Titration Process

Titration Determination

Aquastar Coulometric Reagents

Our Karl Fischer coulometric reagents have been used for accurate and reproducible water determination for over 40 years. Our full range of reagents include the convenient CombiCoulomat reagents which have the advantage that even in diaphragm cells, only one reagent is required. This simplifies the application and excludes any mistakes.

In addition, separate reagents for anode and cathode cell, as well as reagents for the fritless cell are also available. All our coulometric reagents are chloroform free. For oil samples, solvents such as xylene, toluene or decanol can be added.

Benefits

Fast analysis, fast pre-titration
For samples with low water content
Distinct endpoint to ensure confidence in results
Reliable and consistent high quality for reproducible results
Only one reagent necessary when using CombiCoulomat frit

Aquastar CombiCoulomat fritless

Designed for the Karl Fischer coulometric titration without a diaphragm, our Aquastar CombiCoulomat fritless can also be used for cells with a diaphragm in both the anode and cathode cells.

Aquastar CombiCoulomat frit

A reagent designed for the coulometric cell with a frit for a fast and precise determination of very low water contents, it can also be used for both anode and cathode cell.

Aquastar Coulomat A-NC / Aquastar Coulomat C-NC

Cells with a diaphragm require reagents for each cell. Aquastar Coulomat C-NC, and A-NC are available if separate anolyte and catholyte reagents are preferred.

Analytical Methods and products

We provide a complete range of high-quality products for accurate, brilliant results in a variety of analytical applications, including HPLC, GC, Karl Fischer titration, elemental trace analysis, classical analysis, air monitoring, food and beverage analysis, and proficiency testing. We also supply a complete range of safety equipment.