Thermometric titration – the ideal complement to potentiometric titration

What is thermometric titration? 02 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 titrimetric applications. As a result, potentiometric titration has become firmly established and features in many standards. However, a suitable indicator electrode is not always available for an existing problem. There may be no suitable sensor for the analyte at hand or the sample matrix can either interfere with the indicator electrode or even render it unusable. However,...

• Easy learning and easy carrying-out of thermometric titration through incorporation of the method in the tiamoM 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

Titrotherm 859 – can you feel the heat? 04 The 859 Titrotherm combines innovative sensor technology with Metrohm’s unique know-how in titration. 859 Titrotherm – latest 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 Titrot

The universal, clearly laid-out tiamo™ 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. L? TE7 - sample sulfate fertilizer...

Automation pays dividends! Increasing sample numbers, time-consuming sample pre­ aration steps and unattended overnight operation p are good reasons for using sample changers. The 859 Titrotherm comes with the necessary intelligence to con­­­­ trol 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 t

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 glass 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...

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 Typical applications for thermometric...

Application example 1: Direct determination of sodium in foodstuffs, using ketchup as an example Because direct determination of sodium by means of atomic absorption spectroscopy (AAS) or inductively coupled plasma mass spectroscopy (ICP-MS) is a very expensive and time-consuming process, also requiring a large amount of investment in the infrastructure, the method frequently adopted is indirect determination by way of quantitative analysis of chloride. However, this can lead to very inaccurate results, since the sodium in foodstuffs can also be present in the form of sodium benzoate or monosodium...

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...

Titrotherm 859 USB-enabled thermometric titrator with two measuring inputs for Thermoprobe. Four MSB connections for 800 Dosinos and stirrer. Including Thermoprobe Dosino Rod stirrer 804 Titration stand without stand rod Dosing Unit 10 mL Cable USB A - mini-DIN 8 pins Titration vessel lid SGJ Titration vessel 10 - 90 mL Stand rod with base plate Clamping ring Electrode holder tiamo™ 2.3 light CD: 1 license Optional accessories HF-resistant Thermoprobe Bottle holder for 800 Dosino Rack for 846 Dosing Interface PFA titration vessel 10 - 90 mL Dosing Unit 2 mL Dosing Unit 5 mL Dosing Unit 20 mL Dosing...