Determination of Chlorite by Direct Titration with Thiosulfate

Význam tématu

Direct titration of chlorite via thermometric endpoint detection offers rapid and accurate quantification essential for quality control in industrial processes such as leather treatment. Monitoring chlorite levels ensures process efficiency and safety by preventing under- or over-treatment.

Cíle a přehled studie

This application note outlines a method for direct determination of chlorite in hide treatment solutions using sodium thiosulfate titrant. The goal is to establish a reliable, automated procedure based on thermometric titration to deliver reproducible results with minimal sample preparation.

Použitá metodika a instrumentace

The procedure involves acidification of a measured aliquot with acetic acid followed by titration with standard 0.5 mol/L sodium thiosulfate. Endpoint detection relies on measuring heat changes during the exothermic reaction. Key parameters include:

• Titrant delivery rate 2 mL/min
• Delay before start 3 seconds
• Stirring speed setting 5 on 80-2 stirrer
• Data smoothing factor 60

Použitá instrumentace

The following equipment is used:

• Thermometric titrator with temperature sensor
• 80-2 stirring device with spinring stirrer
• 140 mL titration beaker
• Class A pipettes

Hlavní výsledky a diskuse

Repeated analysis (n=8) yielded an average chlorite concentration of 4.95 ± 0.03 g/L as sodium chlorite. Endpoint determination was achieved by the second derivative of the temperature curve, ensuring precise stop of titration. The method showed high repeatability and minimal baseline drift.

Přínosy a praktické využití metody

• Rapid automated titration with clear endpoint detection
• High accuracy and repeatability suited for quality assurance
• Minimal reagent consumption and simple sample preparation
• Adaptable to routine monitoring in industrial laboratories

Budoucí trendy a možnosti využití

Future developments may include integration with process control systems for real-time monitoring, expansion to other oxidizing agents, miniaturized flow-through titration cells, and coupling with chemometric data analysis to further enhance performance.

Závěr

The direct thermometric titration provides a robust, reliable, and efficient method for chlorite determination in industrial samples. Its simplicity and automation potential make it a valuable tool for laboratories focusing on quality control and process monitoring.