Product category:
Titration equipment
News Release from: Metrohm UK | Subject: Titrotherm
Edited by the Laboratorytalk Editorial
Team on 30 March 2006
Thermometric titrimetry gives another
dimension
Thermometric titrimetry gives the analyst another dimension in analytical problem solving, since it employs the most basic property of chemical reactions - enthalpy change - to detect the endpoint
Thermometric titrimetry offers the analyst speed, accuracy and precision What is a thermometric titration?
This article was originally published on Laboratorytalk on 27 Jun 2008 at 8.00am (UK)
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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 in many standards.
Further reading
Potentiometric titration with thermoprobe
Thermometric titration is a versatile determination method and an ideal complement to potentiometric titration, suitable for any reaction that produces a sufficiently large temperature change
Determination of aluminium in antiperspirants
Thermometric titration is a versatile method and an ideal complement to potentiometric titration, suitable for any reaction that produces a sufficiently large temperature change in the sample solution
Determination of free fatty acid in olive oil
The acid content of oils - often only present in traces - is a quality criterion and can be determined by thermometric titration
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 (deltaH).
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.
Scope of thermometric titration.
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 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.
Advantages of thermometric titration.
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.
Thermoprobe - quick, precise and robust.
Thermoprobe, a temperature sensor based on semiconductor technology (thermistor), has a short response time of 0.3s and a high resolution of 10-5K.
This makes the Thermoprobe the ideal sensor for thermometric titration, as it can follow any change in temperature quickly and accurately.
The housing made of polypropylene (PP) and epoxy resin provides the sensor with outstanding resistance to many organic solvents and aggressive media.
The software - everything at a glance, everything under control The clearly laid out Titrotherm software allows adaptation of the screen view to the particular method parameters and thus provides rapid access to important commands or parameters.
The endpoints are determined by calculating the first and second derivatives of the titration curve; by means of additional optimization parameters, the reproducibility can be improved even further.
For report generation, the titration data can be exported manually or automatically into a freely arranged, method-specific report form. Request a free brochure from Metrohm UK ...
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