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Signal processing with a summing operational amplifier in multicomponent potentiometric titrations.

¹Department of Analytical Chemistry, Jagiellonian University, Kraków, Poland.

|June 1, 1987

Summary

A new electronic device enhances multicomponent potentiometric titrations by summing electrode potentials. This allows simultaneous determination of multiple analytes from a single titration curve, improving analytical scope.

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Area of Science:

Analytical Chemistry
Electrochemistry
Chemical Analysis

Background:

Multicomponent potentiometric titrations traditionally face limitations in simultaneously determining multiple analytes from a single titration curve.
Accurate quantification requires distinct potential jumps for each analyte, which can be challenging to achieve with standard titration setups.

Purpose of the Study:

To introduce an auxiliary electronic device, a summing operational amplifier, to extend the capabilities of multicomponent potentiometric titrations.
To enable simultaneous determination of analytes from a single titration curve by processing electrode potentials.

Main Methods:

Utilized a novel auxiliary electronic device (summing operational amplifier) connected to a standard titration apparatus.
Measured the sum of electrode potentials from two indicator electrodes (platinum and copper ion-selective electrode).
Applied the method to complexometric potentiometric titrations of Fe(III) and Cu(II) mixtures.

Main Results:

The proposed device successfully enabled simultaneous determination of Fe(III) and Cu(II) from a single titration curve.
The auxiliary device allows for adjustment of the relative potential jump sizes at titration endpoints.
Demonstrated significant extension in the scope of multicomponent potentiometric titrations.

Conclusions:

The developed signal processing method using a summing operational amplifier is effective for simultaneous multicomponent analysis.
This approach enhances the utility of potentiometric titrations for complex mixtures, offering improved analytical efficiency and scope.