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A full automatic device for sampling small solution volumes in photometric titration procedure based on multicommuted

Sivanildo S Borges¹, Gláucia P Vieira, Boaventura F Reis

¹Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Avenida Centenário 303, 13400-970 Piracicaba, SP, Brazil.

Journal of Automated Methods & Management in Chemistry

|March 5, 2008

Summary

An automated titration device precisely dispenses titrant solutions and determines volumes independently of time and flow rate. This innovation enhances accuracy in chemical analysis, achieving a 1.5% relative standard deviation.

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Area of Science:

Analytical Chemistry
Instrumentation Science

Background:

Accurate titrant delivery is crucial for precise chemical analysis.
Existing methods may face challenges with flow rate and time dependency.

Purpose of the Study:

To develop an automated device for precise titrant solution delivery and volume determination.
To improve the accuracy and reliability of titration processes.

Main Methods:

Utilized a vertically oriented glass tube as a titrant reservoir with electronic controls.
Implemented a photometer with a green LED and phototransistor for endpoint detection.
Designed a volume determination system using an infrared LED and photodiode.
Automated the process using three-way solenoid valves for container loading and titration.

Main Results:

Achieved a linear relationship (R=0.999) between delivered volumes (5-105 µL) and generated potential difference.
Demonstrated the device's utility in photometric titration of HCl with NaOH using phenolphthalein.
Obtained a relative standard deviation of 1.5% in experimental results.

Conclusions:

The proposed automated device offers precise and reliable titrant delivery and volume measurement.
This instrumentation advances automated chemical analysis, particularly in titration applications.
The system's independence from flow rate and time ensures consistent performance.