Metrohm has announced that a technique for determining aluminium in antiperspirants is available for the Metrohm 859 Titrotherm.
Aluminium chloride, aluminium chlorohydrate and aluminium-zirconium compounds are the most widely used antiperspirants.
Aluminium-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 these aluminium-based products must be known accurately within the deodorant matrix and, until recently, the determination of these products has proven to be difficult.
This technique for determining aluminium in antiperspirants is available for the Metrohm Titrotherm.
Thermometric titration complements potentiometric titration and is, in principle, suitable for any reaction that produces a sufficiently large temperature change in the sample solution.
Metrohm said it is particularly suitable for 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; or for which no solvent is available that is suitable for potentiometry.
The 859 Titrotherm, a temperature sensor based on semiconductor technology (thermistor) has a response time of 0.3sec and a resolution of 10-5K.
This is said to make the Thermoprobe suitable for thermometric titration, as it can follow any change in temperature quickly and accurately.
