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Related Experiment Video

Updated: Apr 15, 2026

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
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Rapid and portable electrochemical quantification of phosphorus.

Athanasios V Kolliopoulos1, Dimitrios K Kampouris1, Craig E Banks1

  • 1Faculty of Science and Engineering, School of Chemistry and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, Lancs, U.K.

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Summary

A new electrochemical method offers a faster, more sensitive way to detect dissolved phosphorus in water, improving on the standard EPA colorimetric test. This portable PhosQuant device uses screen-printed electrodes for rapid analysis without harsh chemicals.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Electrochemistry

Background:

  • Phosphorus is a key indicator of water eutrophication.
  • Current EPA methods for total phosphorus detection are colorimetric, requiring sample digestion and specific reducing agents.
  • On-site analysis for dissolved phosphorus is needed.

Purpose of the Study:

  • To develop and validate a novel indirect electrochemical sensing protocol for dissolved phosphorus measurement.
  • To adapt the EPA-recommended colorimetric method into an electrochemical approach using screen-printed electrodes.
  • To assess the performance and advantages of the new electrochemical method compared to the standard colorimetric method.

Main Methods:

  • An electrochemical adaptation of the EPA colorimetric method using screen-printed graphite macroelectrodes.
  • Cyclic voltammetry was employed for orthophosphate determination in pH 1 solutions.
  • Validation using ion chromatography and ICP-OES for polluted water samples.

Main Results:

  • The electrochemical protocol determined orthophosphates from 0.5 to 20 μg L⁻¹ with a limit of detection of 0.3 μg L⁻¹.
  • Shorter reaction times were required compared to the standard colorimetric method.
  • The method was validated in canal water samples, showing advantages in detection limits and experimental time.

Conclusions:

  • The novel electrochemical protocol provides a sensitive and rapid method for dissolved phosphorus detection.
  • The developed PhosQuant device demonstrates the potential for portable, on-site water quality monitoring.
  • This electrochemical adaptation offers an alternative to the traditional EPA method, eliminating the need for specific reducing agents.