USB oven sample processor for sample preparation

The oven method is suitable for samples that only release their moisture at higher temperature, for hardly soluble samples, or samples that undergo side-reactions with the KF reagent.

If the 874 USB oven sample processor is connected to a PC, the instrument is recognized automatically.

Running a temperature gradient, the optimal oven temperature for every sample can be defined.

800 Dosinos can be attached to one of the MSB ports of the sample changer.

With a Dosino and a dosing unit, the reagent exchange can be done automatically.

In the oven method, the sample is weighed in a vial, tightly closed and placed on the rack.

The sample is then heated up in the oven and the moisture evaporated.

A double hollow needle pierces the septum and a dry carrier gas flow transports the moisture into the titration cell where the KF titration takes place.

A big advantage of the oven method is the fact that the sample itself is not introduced into the titration vessel.

Contamination of the oven and the titration cell, as well as side-reactions and matrix effects are eliminated.

The highest possible oven temperature should be chosen to ensure a fast evaporation of the moisture and a quick transport into the titration cell.

But the sample should not start to decompose as the products of decomposition would falsify the results.

The 874 USB oven sample processor offers customers the possibility to subject the unknown sample to a temperature gradient.

The optimal oven temperature can be then be defined based on the resulting heating curve.

Besides a stirrer, Dosinos and dosing units can be attached to the 874.

This makes it possible to aspirate spent reagent and add fresh solvent automatically.

There is no need to open the cell, which means that no additional moisture is introduced.

This shortens conditioning and saves time.

Furthermore, the Dosino can be used to add auxiliary solutions such as buffers or solubilisers.