Metrohm^® 859 Titrotherm

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859 Titrotherm is a USB-enabled thermometric titrator with one measuring input each for a Thermoprobe and a potentiometric sensor as well as four MSB connections for 800 Dosino^® and stirrers. Titrotherm software, a Thermoprobe and a USB connecting cable for a PC are also included.

What is thermometric titration?
Titration is the oldest and most widespread method used in analytical chemistry. For a long time now, potentiometric sensors (indicator electrodes) have been used to cover a wide range of applications in the titration field. As a result, potentiometric titration has become an established analytical method and features many standards.

The electrochemical potential is only one of the possible ways of following a chemical reaction. A far more universal parameter is the reaction enthalpy.

Every chemical reaction is accompanied by a change in enthalpy (_H). As long as the reaction takes place, this results in either an increase (exothermal reaction) or decrease (endothermal reaction) in the temperature of the sample solution. For a simple reaction this means that the increase or reduction in temperature depends on the converted amount of substance.

Thermometric method advantages

• Proven method
• Problem solver for difficult samples that cannot be titrated potentiometrically
• Rapid results
• Robust method for routine work
• Well suited for aggressive media

Thermometric sensor advantages

• One sensor for all applications
• Maintenance-free sensor
• No membrane or diaphragm problems
• No sensor calibration required
• Well suited for aggressive media

Thermometric titration is a very versatile determination method, and it is 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 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

Typical applications of thermometric titration

Sodium	Food stuffs	Al(NO3)2
Sulfate	Phosphate-containing solutions	Ba2+
Phosphate	Buffer pH 10 (NH3/NH4Cl)	Mg2+
Nickel	Ore leachates	Dimethylglyoxime
Acid mixtures	Electroplating baths (containing HF)	NaOH