Thermometric titration of aluminium antiperspirant

Metrohm UK has introduced the Titrotherm, a temperature sensor based on semiconductor technology, for determining the level of aluminum in antiperspirants.

Aluminum chloride, aluminum chlorohydrate, and aluminum-zirconium compounds, are the most widely used antiperspirants.

Aluminum-based complexes react with the electrolytes in the sweat to form a gel plug in the duct of the sweat gland.

The plugs prevent the gland from excreting liquid and are removed over time by the natural "exfoliation" of the skin.

The blockage of a large number of sweat glands reduces the amount of sweat produced in the underarms, though this may vary from person to person.

The level of aluminum in these products must be known accurately within the deodourant matrix, and until recently, the determination of these products has proven to be difficult.

A new technique for determining aluminum in antiperspirants has been developed by Metrohm called the Titrotherm.

This is a fast, direct method with excellent reproducibility.

Thermometric titration is a very versatile determination method and an ideal complement to potentiometric titration.

In principle it is suitable for any reaction that produces a sufficiently large temperature change in the sample solution.

It is particularly suitable for the following applications...

*for which no suitable potentiometric sensor is available.

*for which no suitable reference electrode is available.

*in which the sample affects the indicator electrode or destroys it.

*for which no solvent is available that is suitable for potentiometry.

The 859 Titrotherm combines sensor technology with Metrohm's titration know-how.

The temperature sensor based on semiconductor technology (thermistor), has a short response time of 0.3 s and a high resolution of 10-5 K.

This makes the Thermoprobe the ideal sensor for thermometric titration, as it can follow any change in temperature quickly and accurately.

Metrohm's Dosino technology has defined a new standard for volumetric titration.

The dosing unit with its drive motor is mounted on the reagent bottle and thus guarantees maximum precision with minimum space requirements.

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