Advantages of thermometric titration
• Proven method
• Easy learning and easy carrying-out of thermometric titration through incorporation of the method in the tiamoTM titration software
• Problem solver for difficult samples that cannot be titrated potentiometrically
• Rapid results
• No sensor calibration required
• Maintenance-free sensor
• Robust method for routine work
• Well suited for aggressive media
• One sensor for all applications
• No membrane or diaphragm problems
859 Titrotherm –modern USB technology for perfect ease of use
The 859 Titrotherm’s easy operation becomes apparent even during installation. Thanks to advanced USB technology the instrument is recognized automatically by the tiamoTM titration software when it is connected to the PC and does not have to be manually configured. The same applies to the Dosing Units, stirrers and sensors connected to the Titrotherm.
tiamoTM – everything at a glance, everything under control
The universal, clearly laid-out tiamoTM software allows the titration parameters to be adapted quickly to the particular method and thus provides rapid, effective method development and also fast and easy generation of results. 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 template.
Automation pays dividends!
Increasing sample numbers, time-consuming sample preparation steps and unattended overnight operationare good reasons for using sample changers. The 859 Titrotherm comes with the necessary intelligence to control sample processors. Together with the 814 USB Sample Processor and 815 Robotic USB Sample Processor XL, the 859 Titrotherm offers a high degree of automation at low investment costs. It’s amazing: You simply connect the sample changer to the Titrotherm’s USB port and the world of automation opens up to you.
Thermoprobe – quick, precise and robust
Thermoprobe, a temperature sensor based on semiconductor technology (thermistor), has a response time of only 0.3 s and a 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. The housing made of polypropylene (PP) and epoxy resin provides the sensor with outstanding resistance to many organic solvents and aggressive media.
Dosino technology – precise and simple dosing
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. The titrator and two burets require hardly more bench space than a sheet of DIN A5 paper!
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
Catalytically enhanced thermometric titration
At very low sample concentrations or with low molar reaction enthalpies, the temperature change during the reaction is often inadequate for the reliable determination of the endpoint. With a clever trick it is possible to obtain a proper «jump» in such reactions. An example is the determination of very small amounts of organic acids with the titrant c(KOH) = 0.1 mol/L in isopropanol. In this case the addition of a small amount of paraformaldehyde makes it easier to detect the endpoint, for as soon as the endpoint is reached (i.e. as soon as excess hydroxide ions are present) the base-catalyzed hydrolysis of the paraformaldehyde starts. This strongly endothermic reaction now provides a well marked endpoint.