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Automatic flow procedure based on multicommutation exploiting liquid-liquid extraction for spectrophotometric lead
Ana Lúcia D Comitre1, Boaventura F Reis
1Instituto de Química de São Carlos, Universidade de São Paulo, Brazil.
Talanta
|October 31, 2008
Summary
This study presents an affordable automatic flow system for determining lead in plant materials using liquid-liquid extraction. The method is accurate, efficient, and generates less waste, offering a viable alternative for lead analysis.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Lead contamination in plant materials poses risks to ecosystems and human health.
- Accurate and cost-effective methods for lead determination are crucial for environmental monitoring.
Purpose of the Study:
- To develop an inexpensive automatic flow system for lead determination in plant samples.
- To utilize multicommutation and liquid-liquid extraction for efficient lead analysis.
- To validate the system's performance against established analytical techniques.
Main Methods:
- An automatic flow system employing multicommutation and liquid-liquid extraction was designed.
- Spectrophotometry with dithizone was used for lead detection.
- An air stream was used as a carrier to minimize waste generation.
Main Results:
- The system demonstrated excellent agreement with Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES).
- Achieved a linear response range of 50-200 µg/L Pb (r=0.999).
- Reported a sampling rate of 15 determinations/hour, RSD of 1.8%, and a detection limit of 12 µg/L.
Conclusions:
- The developed automatic flow system is a cost-effective and efficient tool for lead determination in plant materials.
- The method significantly reduces organic solvent waste.
- This approach offers a reliable and environmentally conscious alternative for lead analysis.
