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A flow cell optosensor for lead based on immobilized gallocynin in chitosan membrane.
1School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia.
Talanta
|October 31, 2008
Summary
This study presents a novel optical sensor for detecting lead (Pb) in solutions. The sensor, utilizing gallocyanin immobilized in a chitosan membrane, offers a sensitive and reproducible method for lead determination.
Area of Science:
- Analytical Chemistry
- Materials Science
- Environmental Science
Background:
- Lead (Pb) is a toxic heavy metal with significant environmental and health concerns.
- Accurate and sensitive detection methods for lead are crucial for environmental monitoring and public health.
- Development of novel sensor materials and systems is essential for improving lead detection capabilities.
Purpose of the Study:
- To develop and evaluate an optical sensor for lead detection using gallocyanin immobilized in a chitosan membrane.
- To determine the performance characteristics of the sensor, including its concentration range, detection limit, and repeatability.
- To assess the sensor's reproducibility and regenerability, as well as its selectivity in the presence of foreign ions.
Main Methods:
- Immobilization of gallocyanin onto a chitosan membrane to create a sensor element.
- Utilization of a flowing system for lead determination.
- Spectrophotometric analysis to quantify lead concentrations.
- Regeneration of the sensor using acidified saturated potassium nitrate (KNO3) solution.
- Investigation of interference from foreign ions at a 1:1 mole ratio.
Main Results:
- The optical sensor successfully determined lead in solutions within the concentration range of 1.0x10(-1) to 1.0x10(3) ppm.
- A low detection limit of 0.075 ppm for lead was achieved.
- The method demonstrated good repeatability, with a standard deviation of 2.10% at 100 ppm lead.
- The sensor exhibited reproducible responses and could be effectively regenerated.
- Interference studies indicated the sensor's performance in the presence of other ions.
Conclusions:
- Gallocyanin immobilized in a chitosan membrane is a viable sensor element for an optical lead sensor.
- The developed flowing system offers a sensitive, reproducible, and regenerable method for lead detection.
- The sensor shows potential for environmental monitoring applications requiring accurate lead quantification.
