Paper disk on screen printed electrode for one-step sensing with an internal standard
Swee Ngin Tan1, Liya Ge, Wei Wang
1Natural Sciences and Science Education Academic Group, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore, and School of Chemical and Biological Engineering, Yancheng Institute of Technology, 9 Yingbin Road, Yancheng, 224051, China.
Analytical Chemistry
|October 7, 2010
Summary
This study presents a novel point-of-care device for rapid lead detection. The portable system integrates reagents and self-calibration for accurate, single-step analysis of trace lead in small samples.
Area of Science:
- Analytical Chemistry
- Electrochemistry
- Materials Science
Background:
- Point-of-care devices require integrated reagent storage and self-calibration for field usability.
- Accurate analysis with minimal sample introduction is crucial for portable diagnostic tools.
Purpose of the Study:
- To develop and demonstrate a portable, single-step assay device for trace heavy metal detection.
- To integrate reagent storage and self-calibration onto a screen-printed electrode for a user-friendly device.
Main Methods:
- A paper disk impregnated with reagents, internal standard (Zn(II)), and buffer was utilized.
- Simultaneous (in situ) plating of bismuth and heavy metals onto a screen-printed electrode formed alloys.
- Anodic stripping voltammetry was employed for quantitative analysis.
Main Results:
- The device successfully detected trace lead at ppb levels in 10 μL solutions.
- The use of zinc(II) as an internal standard ensured accurate and reliable results.
- The single-step assay format simplified the analytical procedure.
Conclusions:
- The developed point-of-care device offers a promising platform for field-based heavy metal analysis.
- The integrated approach of reagent storage and self-calibration enhances portability and ease of use.
- This technology is attractive for environmental monitoring and potential point-of-need diagnostics.
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