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Single standard calibration and data processing in flow injection titration based on concentration gradients.

M C Araújo¹, A V Santos, R S Honorato

¹Departamento de Química, CCEN Universidade Federal da Paraíba C.P. 5093 João Pessoa PB 58051-970 Brazil.

The Journal of Automatic Chemistry

|January 1, 1997

Summary

This summary is machine-generated.

Flow injection analysis utilizes concentration gradients for precise titrations. This method accurately determines analytes like Fe(II) and acetic acid with high throughput.

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Area of Science:

Analytical Chemistry
Chemical Engineering

Background:

Traditional titration methods can be time-consuming and require significant sample volumes.
Developing rapid and efficient analytical techniques is crucial for high-throughput screening and process monitoring.

Purpose of the Study:

To develop and validate a novel flow injection (FI) analysis method for quantitative determinations.
To leverage concentration gradients within FI systems for stoichiometric endpoint detection.
To achieve high accuracy and precision in analyte quantification with minimal calibration standards.

Main Methods:

Two FI procedures were developed: titrant injection into sample stream and sample injection into titrant stream.
Utilized concentration gradients generated in a mixing chamber within the FI manifold.
Employed a single standard solution for gradient calibration, converting detector signals to instantaneous concentration values.
Microcomputer control and data processing identified stoichiometric points via abrupt signal changes.

Main Results:

The method demonstrated high sampling capability (40-60 samples/hour).
Achieved a mean relative standard deviation below 1% and an average accuracy of 1%.
Successfully applied to the determination of Fe(II) (spectrophotometry) and acetic acid (conductimetry).

Conclusions:

Flow injection analysis using concentration gradients offers a rapid, accurate, and precise method for chemical determinations.
The single-standard calibration approach simplifies the analytical procedure.
The developed technique is suitable for high-throughput analysis in various chemical applications.