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Related Concept Videos

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Updated: Mar 6, 2026

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
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Phosphorus in recycling fertilizers - analytical challenges.

Oliver Krüger1, Christian Adam2

  • 1Beuth University of Applied Sciences, Luxemburger Str. 10, 13353 Berlin, Germany.

Environmental Research
|March 9, 2017
PubMed
Summary

Recycling phosphorus from municipal wastewater is crucial for sustainable fertilizer production. Standardized testing methods are needed to accurately assess the efficiency of new phosphorus recovery materials.

Keywords:
Analytical methodsPhosphorus recoveryPlant availabilityRecycling fertilizerRobustness tests

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Area of Science:

  • Environmental Science
  • Agronomy
  • Resource Management

Background:

  • Growing concerns over phosphorus resource depletion and contamination of traditional phosphate rock.
  • Municipal wastewater represents a significant, underutilized source of phosphorus for fertilizer production.

Purpose of the Study:

  • To evaluate the suitability of various secondary raw materials for phosphorus recovery.
  • To assess the applicability of existing analytical methods for determining phosphorus content and solubility in these new materials.

Main Methods:

  • Testing total phosphorus content using inverse aqua regia digestion.
  • Assessing phosphorus solubility using neutral ammonium citrate (Pnac) and water extractions.
  • Conducting robustness tests to evaluate method suitability and identify dependencies.

Main Results:

  • Inverse aqua regia digestion proved effective for total phosphorus determination.
  • Pnac extractions were feasible across different matrices, but showed significant time and temperature dependencies, especially with organic matter.
  • Several materials did not reach equilibrium during extraction, highlighting variability in test results.

Conclusions:

  • Standardized testing protocols are essential for accurate and comparable assessment of phosphorus recovery materials.
  • Further research is needed to refine analytical methods for diverse secondary raw materials.
  • Effective phosphorus recycling from wastewater can contribute to a more sustainable fertilizer industry.