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Loop flow analysis of dissolved reactive phosphorus in aqueous samples.

Jian Ma1, Quanlong Li1, Dongxing Yuan1

  • 1State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361005, Fujian, China.

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|April 15, 2014
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Summary

A new loop flow analysis (LFA) method accurately measures dissolved reactive phosphorus (DRP) in water, overcoming salinity and bubble interference common in older methods. This robust technique offers precise results for environmental monitoring.

Keywords:
Dissolved reactive phosphorusLoop flow analysisPhosphomolybdenum blueSpectrophotometry

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Traditional flow-based methods for dissolved reactive phosphorus (DRP) determination are susceptible to interferences from salinity and bubble formation.
  • These interferences can compromise the accuracy of optical detection methods.

Purpose of the Study:

  • To develop a simple, robust loop flow analysis (LFA) method for accurate DRP measurement in diverse aqueous samples.
  • To address the limitations of existing methods, particularly interference from salinity and bubbles.

Main Methods:

  • Utilized the phosphomolybdenum blue (PMB) reaction chemistry.
  • Employed a novel cross-shaped flow cell for PMB formation and detection at 700 nm with a miniature spectrophotometer.
  • Evaluated reagent effects on PMB kinetic formation and assessed interferences.

Main Results:

  • Achieved a detection limit of 32 nM with a 1 cm optical pathlength.
  • Demonstrated high reproducibility with relative standard deviations of 1.8% (n=113), 1.0% (n=49), and 0.39% (n=9) for phosphate solutions.
  • Showed no significant interference from salinity (0-34 PSU), silicate, or arsenate, with excellent agreement (R²=0.9987) to reference methods and recoveries from 95.4% to 103.7%.

Conclusions:

  • The proposed LFA method is a simple, robust, and accurate technique for DRP determination in various aqueous matrices.
  • The method overcomes limitations of salinity and bubble interference, offering higher reproducibility and easier operation.
  • This LFA method is suitable for reliable environmental monitoring of phosphorus levels.