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Redox-Based Electrochemical Affinity Sensor for Detection of Aqueous Pertechnetate Anion
Sayandev Chatterjee1, Meghan S Fujimoto1, Yingge Du2
1Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States.
ACS Sensors
|February 8, 2020
Summary
This study introduces a novel electrochemical sensor for detecting pertechnetate (TcO4-) in complex water samples. The sensor achieves high sensitivity and selectivity, crucial for environmental monitoring and ensuring safe drinking water.
Area of Science:
- Electrochemistry
- Environmental Science
- Analytical Chemistry
Background:
- Detecting pertechnetate (TcO4-) in complex matrices with interfering ions like nitrate, chloride, and chromate is difficult.
- Existing sensors often lack the required sensitivity and selectivity to meet global drinking water standards.
Purpose of the Study:
- To develop a highly selective and sensitive electrochemical sensor for in situ pertechnetate detection.
- To overcome the limitations of current methods in complex environmental samples.
Main Methods:
- An affinity-based electrochemical sensor utilizing a 1,4-benzenedimethanethiol capture probe immobilized on an electrode.
- Selective reductive precipitation of pertechnetate, leading to a measurable decrease in electron transfer current.
Main Results:
- Achieved a detection limit of 1 x 10^-10 M for pertechnetate, surpassing the US EPA drinking water standard.
- Demonstrated high selectivity for pertechnetate in a multicomponent groundwater sample containing nitrate, chloride, and chromate.
Conclusions:
- The developed sensor offers a promising solution for accurate pertechnetate monitoring in environmental water.
- This method provides a sensitive and selective approach for detecting pertechnetate, crucial for water quality assessment.
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