Sample preparation for KF Ti-Touch and KF Titrino plus titrators

The oven method involves heating the samples and transferring the evaporated water to the titration cell by means of a dry carrier gas. This method may be a solution for:

• samples that release the water only at high temperatures,
• samples that do not dissolve easily, or
• samples that react with the KF reagent.

And it gets better: with this method, the sample does not get in contact with the KF reagent, i.e., the electrode and the titration cell are not contaminated, and carryover and memory effects are ruled out.

Metrohm offers the 860 KF Thermoprep for the oven method. If you would like to take your productivity one step further, you can also automate sample preparation and analysis with an 885 Compact Oven Sample Changer.

If simple evaporation is not an option, e.g., for the analysis of crude oil, tar, turpentine, resins, or terpenes, then you can use the KF Evaporator.

This instrument applies the principle of azeotropic distillation, meaning that a solvent is added to the sample and the mixture is heated. The water evaporates with this solvent, and the mixture is transferred to the titration cell and analyzed.

As an added benefit, the titration cell and the electrode are not contaminated and secondary reactions are excluded, since only the water reaches the titration cell.

If you are dealing with solid samples, then rely on the Polytron high-quality homogenizer.

The Polytron allows you to homogenize your samples thoroughly and reliably.