Related Experiment Videos
Multiplexed colorimetric solid-phase extraction: determination of silver(I), nickel(II), and sample Ph
Daniel B Gazda1, James S Fritz, Marc D Porter
1Institute for Combinatorial Discovery, Ames Laboratory US-DOE, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
Analytical Chemistry
|August 17, 2004
Summary
A new multiplexed colorimetric solid-phase extraction (MC-SPE) platform enables rapid, simultaneous water quality testing for multiple parameters like pH, silver, and nickel. This innovation simplifies analysis for environmental and potential space monitoring.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Colorimetric solid-phase extraction (C-SPE) quantifies water analytes using colorimetric reagents on membranes and spectroscopy.
- Existing C-SPE methods are effective but typically analyze one parameter at a time.
Purpose of the Study:
- To design and test a multiplexed colorimetric solid-phase extraction (MC-SPE) platform.
- To enable the simultaneous determination of multiple water quality parameters.
- To assess the platform's efficiency and potential applications.
Main Methods:
- Developed a novel filter holder with discrete channels and a multi-syringe jig for concurrent operation.
- Utilized parameter-specific membranes creating unique addresses for each analyte.
- Employed diffuse reflectance spectroscopy and the Kubelka-Munk function for quantification via calibration curves.
Main Results:
- Successfully demonstrated simultaneous determination of pH, silver(I), and nickel(II).
- Achieved rapid analysis (approx. 120 s) using a small sample volume (3.0 mL).
- Established calibration ranges for silver(I) (0.05-0.5 ppm) and nickel(II) (1.8-5.0 ppm), and pH (2.5-5.0).
Conclusions:
- The MC-SPE platform offers a simplified, rapid, and simultaneous method for water quality analysis.
- The technology shows promise for expanding to more analytes and for both terrestrial and extraterrestrial monitoring.
- MC-SPE represents a significant advancement in field-deployable water quality assessment tools.