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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

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Coulometric titration with air transported sample.

A D Dakashev¹, V T Dimitrova

¹Department of Analytical Chemistry, Prof. Dr. Assen Zlatarov University, 8010 Bourgas, Bulgaria.

|October 31, 2008

Summary

This study introduces a microconduit system for precise electrochemical titrations. The method allows for controlled generation of titrants, enabling accurate determination of analytes like hydrochloric acid and aniline.

Area of Science:

Analytical Chemistry
Electrochemistry

Background:

Electrochemical titration offers a precise method for analyte quantification.
Microfluidic systems provide advantages in reaction control and sample handling.

Purpose of the Study:

To develop and validate a microconduit system for electrochemical titrations.
To enable controlled, in-situ generation of titrants for accurate analyte determination.

Main Methods:

Samples are propelled through a microconduit system including a titration cell, coil, and detector cell.
Titrant generation is controlled by varying sample residence time in the titration cell.
Electrochemical detection is used for analyte quantification post-titration.

Main Results:

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The system demonstrated successful coulometric titration of hydrochloric acid with electrogenerated sodium hydroxide.
The method was also verified for the titration of aniline using electrogenerated bromine.
Varying sample movement rates allowed for precise control over titrant quantities.

Conclusions:

The developed microconduit system is effective for electrochemical titrations.
This approach offers a versatile platform for quantitative analysis of various analytes.
The method provides accurate and reproducible results for complex titration scenarios.