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Multichannel Dilution Analysis Using a Single Peristaltic Pump Tube
Robbie M Huff1, Willis B Jones1, Bradley T Jones2
1Department of Chemistry and Biochemistry, University of North Florida, Jacksonville, Florida, USA.
Applied Spectroscopy
|February 6, 2025
Summary
Multi-channel dilution analysis (MCDA) offers a new way to calibrate analytical instruments by automatically diluting standards. This method, adapted for ICP-OES and ICP-MS, ensures accurate results across various matrices.
Area of Science:
- Analytical Chemistry
- Spectroscopy
Background:
- Multi-channel dilution analysis (MCDA) is a novel calibration technique.
- Traditional MCDA requires specific pump configurations, limiting its application.
Purpose of the Study:
- To adapt MCDA for instruments with fewer pump channels.
- To validate the modified MCDA method for ICP-OES and ICP-MS.
Main Methods:
- Utilized a single peristaltic pump line to drive solution through a tubing manifold.
- Applied the modified MCDA to inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS).
- Validated the method using certified reference materials and spiked matrices.
Main Results:
- Achieved analyte recoveries between 83% and 117% with relative standard deviations around 1%.
- Demonstrated effective matrix matching for challenging samples (e.g., high ethanol, calcium).
- Showcased improvements in calibration statistics for ICP-MS.
Conclusions:
- The adapted MCDA method is a feasible and accurate calibration technique for ICP-OES and ICP-MS.
- This adaptation overcomes hardware limitations, broadening MCDA's applicability.
- MCDA provides reliable matrix-matched calibration, enhancing analytical accuracy.
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