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Титрувай по-бързо, по-безопасно и по-лесно - виж OMNIS!

Sample preparation for Karl Fischer Titrandos and Titrino Coulometers

The water content of some samples cannot be determined directly with titration.

For such cases, Metrohm offers various techniques that allow you to prepare samples for coulometric or volumetric water determination.

KF Titrando Sample Preparation

Key features

  • If your samples don’t dissolve easily, use the oven method.
  • If the water is difficult to extract from the sample, use azeotropic distillation.
  • If your samples are solid, use the Polytron homogenizer.
  • If you have a high sample throughput, automate sample preparation and analysis.
All products for sample preparation

Sample preparation for Titrando systems (7)

874 USB Oven Sample Processor customized with tiamo™ full

2.874.0020
The 874 Oven Sample Processor is used for automatic thermal sample preparation in Karl Fischer titration. The oven method is particularly suitable for samples that do not release their water until higher temperatures have been reached, for sparingly soluble samples or those that react with the KF reagent.This instrument can be modified to match customer-specific sample vessels. Please contact your Metrohm representative for further information.

885 Compact Oven Sample Changer

2.885.0010
The 885 Compact Oven Sample Changer is used for thermal sample preparation in Karl Fischer titration. In the oven the samples can be heated up to 250°C. The moisture contained in the sample evaporates and is transported by a dry carrier gas into the titration cell, where the analysis takes place.

860 KF Thermoprep

2.860.0010
The 860 KF Thermoprep is designed for thermal sample preparation in Karl Fischer titration.Numerous substances cannot be analysed by direct Karl Fischer titration as they are not soluble, react with the Karl Fischer reagent or release their water only very slowly or not until heated to high temperatures. Using tightly sealed sample vials, the sample is inserted in the oven. The samples can be subsequently analysed by any volumetric or coulometric KF titrator.

KF Evaporator

2.136.0200
The KF Evaporator is used for sample preparation in Karl Fischer titration by means of azeotropic distillation.As with the oven method, the water is separated from the sample matrix. Because the sample itself remains in the evaporation chamber, the titration vessel and the electrodes are not contaminated. Furthermore, unwanted side reactions and matrix effects are avoided.
Show all systems: Sample preparation for Titrando (7)

For difficult samples: the oven method

The oven method allows you to analyze samples that cannot be titrated directly.

For instance, if your samples have poor solubility or if side reactions with the KF reagent occur, then the oven method may be a suitable solution. In this method, the samples are heated and the evaporated water is transferred to the titration cell with a dry carrier gas. As a result, only the water gets in contact with the cell, thus preventing contamination of the cell and the electrode.

Manual, automated, or software-controlled: your choice

You can implement the oven method just the way you need it.

The 860 KF Thermoprep: This manually operated instrument offers you a simple, straightforward, and affordable solution.

The 885 Compact Oven Sample Changer: This automated sample changer combines the oven method with time savings and ease of use. Thanks to the integrated control panel, complicated parameter settings are not required. You just have to set the gas flow, the temperature, and the number of samples and you’re ready to go.

The 874 USB Oven Sample Processor: Like the titrator, this automated sample processor is controlled with the tiamo software. This enables you, for instance, to record the heating curve of an unknown sample to determine the optimum temperature for the analysis. Moreover, with this instrument, you can automate reagent exchange and thus make your work safer, as you don’t get in contact with the toxic reagent.

Azeotropic distillation with the KF Evaporator

For some samples, such as crude oil, tar, turpentine, resins, or terpenes, simple evaporation does not work.

In such cases, azeotropic distillation with the KF Evaporator can be applied. A solvent is added to the sample, the sample is heated, and the evaporated mixture is transferred to the titration cell and analyzed. As the sample does not enter the titration cell, contamination of the cell or the electrode is prevented.

Homogenization for analyzing solid samples

If you need to analyze solid samples, then you can use the high-quality Polytron homogenizer.

This homogenizer enables you to achieve thorough homogenization and consistent results.

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