Unlike one component Karl Fischer reagents, in two component reagent systems the titrant contains only iodine and methanol, while the solvent contains the other Karl Fischer reaction components - sulfur dioxide and a suitable base dissolved in methanol. It is used as the working medium in the Karl Fischer cell. Aquastar® titrants are available with concentrations of 2 and 5 mg H₂O/mL together with Aquastar® solvent. Two component reagents are distinguished by greater long term stability and a slightly faster titration time

in comparison to one component reagents. This is due to the fact that the Karl Fischer reaction components are divided in between the two reagents making each reagent less susceptible to slow side reactions over time. Faster titration rates result from the initial availability of sulfur dioxide and base in the solvent to which the sample to be analysed is added.

• Slightly faster titration in comparison to one component titration
• High accuracy for reliable results
• Better buffer capacity
• Higher titer stability than one component reagents
• Ensured consistent high quality for comparable results